feat(web): complete topology host verification ui

src/Web/StellaOps.Web/src/app/core/testing/topology-environment-detail-page.component.spec.ts

@@ -0,0 +1,238 @@
+import { provideHttpClient, withInterceptorsFromDi } from '@angular/common/http';
+import { HttpTestingController, provideHttpClientTesting } from '@angular/common/http/testing';
+import { TestBed } from '@angular/core/testing';
+import { Title } from '@angular/platform-browser';
+import { ActivatedRoute, convertToParamMap, provideRouter } from '@angular/router';
+import { of } from 'rxjs';
+
+import { PlatformContextStore } from '../../core/context/platform-context.store';
+import { TopologyEnvironmentDetailPageComponent } from '../../features/topology/topology-environment-detail-page.component';
+import { BreadcrumbService } from '../../layout/breadcrumb';
+
+describe('TopologyEnvironmentDetailPageComponent', () => {
+  let httpMock: HttpTestingController;
+
+  beforeEach(() => {
+    const paramMap = convertToParamMap({ environmentId: 'prod' });
+    const queryParamMap = convertToParamMap({});
+
+    TestBed.configureTestingModule({
+      imports: [TopologyEnvironmentDetailPageComponent],
+      providers: [
+        provideRouter([]),
+        provideHttpClient(withInterceptorsFromDi()),
+        provideHttpClientTesting(),
+        {
+          provide: ActivatedRoute,
+          useValue: {
+            paramMap: of(paramMap),
+            queryParamMap: of(queryParamMap),
+            snapshot: {
+              paramMap,
+              queryParamMap,
+              data: {},
+            },
+          },
+        },
+        {
+          provide: PlatformContextStore,
+          useValue: {
+            initialize: () => undefined,
+            selectedRegions: () => [],
+            selectedEnvironments: () => [],
+            regionSummary: () => 'All regions',
+            environmentSummary: () => 'All environments',
+          },
+        },
+        {
+          provide: BreadcrumbService,
+          useValue: {
+            setContextCrumbs: () => undefined,
+            clearContextCrumbs: () => undefined,
+          },
+        },
+        {
+          provide: Title,
+          useValue: {
+            setTitle: () => undefined,
+          },
+        },
+      ],
+    });
+
+    httpMock = TestBed.inject(HttpTestingController);
+  });
+
+  afterEach(() => {
+    httpMock.verify();
+  });
+
+  it('shows runtime verification on the Targets and Drift tabs', () => {
+    const fixture = TestBed.createComponent(TopologyEnvironmentDetailPageComponent);
+    const component = fixture.componentInstance;
+
+    httpMock.expectOne((req) => req.url === '/api/v2/topology/environments' && req.params.get('environment') === 'prod').flush({
+      items: [
+        {
+          environmentId: 'prod',
+          regionId: 'eu-west',
+          environmentType: 'production',
+          displayName: 'Production',
+          sortOrder: 1,
+          targetCount: 3,
+          hostCount: 3,
+          agentCount: 3,
+          promotionPathCount: 0,
+          workflowCount: 0,
+          lastSyncAt: '2026-03-31T10:00:00Z',
+        },
+      ],
+    });
+    httpMock.expectOne((req) => req.url === '/api/v2/topology/targets' && req.params.get('environment') === 'prod').flush({
+      items: [
+        {
+          targetId: 'target-a',
+          name: 'api-a',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          hostId: 'host-a',
+          agentId: 'agent-a',
+          targetType: 'docker_host',
+          healthStatus: 'healthy',
+          componentVersionId: 'cmp-a',
+          imageDigest: 'sha256:digest-a',
+          releaseId: 'bundle-1',
+          releaseVersionId: 'release-a',
+          lastSyncAt: '2026-03-31T10:00:00Z',
+        },
+        {
+          targetId: 'target-b',
+          name: 'api-b',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          hostId: 'host-b',
+          agentId: 'agent-b',
+          targetType: 'docker_host',
+          healthStatus: 'healthy',
+          componentVersionId: 'cmp-b',
+          imageDigest: 'sha256:digest-b',
+          releaseId: 'bundle-1',
+          releaseVersionId: 'release-b',
+          lastSyncAt: '2026-03-31T09:55:00Z',
+        },
+        {
+          targetId: 'target-c',
+          name: 'api-c',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          hostId: 'host-c',
+          agentId: 'agent-c',
+          targetType: 'docker_host',
+          healthStatus: 'healthy',
+          componentVersionId: 'cmp-c',
+          imageDigest: 'sha256:digest-c',
+          releaseId: 'bundle-1',
+          releaseVersionId: 'release-a',
+          lastSyncAt: '2026-03-31T09:45:00Z',
+        },
+      ],
+    });
+    httpMock.expectOne((req) => req.url === '/api/v2/topology/hosts' && req.params.get('environment') === 'prod').flush({
+      items: [
+        {
+          hostId: 'host-a',
+          hostName: 'alpha.stella.local',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          runtimeType: 'docker_host',
+          status: 'healthy',
+          agentId: 'agent-a',
+          targetCount: 1,
+          lastSeenAt: '2026-03-31T10:00:00Z',
+          probeStatus: 'active',
+          probeType: 'ebpf',
+          probeLastHeartbeat: '2026-03-31T10:00:00Z',
+        },
+        {
+          hostId: 'host-b',
+          hostName: 'beta.stella.local',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          runtimeType: 'docker_host',
+          status: 'healthy',
+          agentId: 'agent-b',
+          targetCount: 1,
+          lastSeenAt: '2026-03-31T09:55:00Z',
+          probeStatus: 'active',
+          probeType: 'ebpf',
+          probeLastHeartbeat: '2026-03-31T09:55:00Z',
+        },
+        {
+          hostId: 'host-c',
+          hostName: 'gamma.stella.local',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          runtimeType: 'docker_host',
+          status: 'healthy',
+          agentId: 'agent-c',
+          targetCount: 1,
+          lastSeenAt: '2026-03-31T09:45:00Z',
+          probeStatus: 'not_installed',
+          probeType: null,
+          probeLastHeartbeat: null,
+        },
+      ],
+    });
+    httpMock.expectOne((req) => req.url === '/api/v2/topology/agents' && req.params.get('environment') === 'prod').flush({
+      items: [
+        { agentId: 'agent-a', agentName: 'agent-a', regionId: 'eu-west', environmentId: 'prod', status: 'active', capabilities: ['docker_host'], assignedTargetCount: 1, lastHeartbeatAt: '2026-03-31T10:00:00Z' },
+        { agentId: 'agent-b', agentName: 'agent-b', regionId: 'eu-west', environmentId: 'prod', status: 'active', capabilities: ['docker_host'], assignedTargetCount: 1, lastHeartbeatAt: '2026-03-31T09:55:00Z' },
+        { agentId: 'agent-c', agentName: 'agent-c', regionId: 'eu-west', environmentId: 'prod', status: 'active', capabilities: ['docker_host'], assignedTargetCount: 1, lastHeartbeatAt: '2026-03-31T09:45:00Z' },
+      ],
+    });
+    httpMock.expectOne((req) => req.url === '/api/v2/releases/activity' && req.params.get('environment') === 'prod').flush({ items: [] });
+    httpMock.expectOne((req) => req.url === '/api/v2/security/findings' && req.params.get('environment') === 'prod').flush({ items: [] });
+    httpMock.expectOne((req) => req.url === '/api/v2/evidence/packs' && req.params.get('environment') === 'prod').flush({ items: [] });
+    httpMock.expectOne('/api/v1/environments/prod/readiness').flush({ items: [] });
+    httpMock.expectOne((req) => req.url === '/api/v2/topology/promotion-paths' && req.params.get('environment') === 'prod').flush({ items: [] });
+    httpMock.expectOne((req) => req.url === '/api/v2/topology/environments' && !req.params.has('environment')).flush({
+      items: [
+        {
+          environmentId: 'prod',
+          regionId: 'eu-west',
+          environmentType: 'production',
+          displayName: 'Production',
+          sortOrder: 1,
+          targetCount: 3,
+          hostCount: 3,
+          agentCount: 3,
+          promotionPathCount: 0,
+          workflowCount: 0,
+          lastSyncAt: '2026-03-31T10:00:00Z',
+        },
+      ],
+    });
+
+    fixture.detectChanges();
+
+    component.activeTab.set('targets');
+    fixture.detectChanges();
+
+    let text = fixture.nativeElement.textContent as string;
+    expect(text).toContain('Runtime');
+    expect(text).toContain('Verified');
+    expect(text).toContain('Drift');
+    expect(text).toContain('Not monitored');
+
+    component.activeTab.set('drift');
+    fixture.detectChanges();
+
+    text = fixture.nativeElement.textContent as string;
+    expect(text).toContain('Runtime Verification');
+    expect(text).toContain('1 verified');
+    expect(text).toContain('1 drift');
+    expect(text).toContain('1 not monitored');
+    expect(text).toContain('Expected Release');
+    expect(text).toContain('Observed Release');
+  });
+});

src/Web/StellaOps.Web/src/app/core/testing/topology-host-detail-page.component.spec.ts

@@ -0,0 +1,108 @@
+import { provideHttpClient, withInterceptorsFromDi } from '@angular/common/http';
+import { HttpTestingController, provideHttpClientTesting } from '@angular/common/http/testing';
+import { TestBed } from '@angular/core/testing';
+import { ActivatedRoute, convertToParamMap, provideRouter } from '@angular/router';
+
+import { PlatformContextStore } from '../../core/context/platform-context.store';
+import { TopologyHostDetailPageComponent } from '../../features/topology/topology-host-detail-page.component';
+
+describe('TopologyHostDetailPageComponent', () => {
+  let httpMock: HttpTestingController;
+
+  beforeEach(() => {
+    const paramMap = convertToParamMap({ hostId: 'host-alpha' });
+
+    TestBed.configureTestingModule({
+      imports: [TopologyHostDetailPageComponent],
+      providers: [
+        provideRouter([]),
+        provideHttpClient(withInterceptorsFromDi()),
+        provideHttpClientTesting(),
+        {
+          provide: ActivatedRoute,
+          useValue: {
+            paramMap: {
+              subscribe: (fn: (value: ReturnType<typeof convertToParamMap>) => void) => {
+                fn(paramMap);
+                return { unsubscribe() {} };
+              },
+            },
+          },
+        },
+        {
+          provide: PlatformContextStore,
+          useValue: {
+            initialize: () => undefined,
+            selectedRegions: () => [],
+            selectedEnvironments: () => [],
+            regionSummary: () => 'All regions',
+            environmentSummary: () => 'All environments',
+          },
+        },
+      ],
+    });
+
+    httpMock = TestBed.inject(HttpTestingController);
+  });
+
+  afterEach(() => {
+    httpMock.verify();
+  });
+
+  it('renders install guidance when a host has no runtime probe heartbeat', () => {
+    const fixture = TestBed.createComponent(TopologyHostDetailPageComponent);
+
+    const hostsReq = httpMock.expectOne((req) => req.url === '/api/v2/topology/hosts');
+    const targetsReq = httpMock.expectOne((req) => req.url === '/api/v2/topology/targets');
+
+    hostsReq.flush({
+      items: [
+        {
+          hostId: 'host-alpha',
+          hostName: 'alpha.stella.local',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          runtimeType: 'docker_host',
+          status: 'healthy',
+          agentId: 'agent-alpha',
+          targetCount: 1,
+          lastSeenAt: '2026-03-31T09:55:00Z',
+          probeStatus: 'not_installed',
+          probeType: null,
+          probeLastHeartbeat: null,
+        },
+      ],
+    });
+
+    targetsReq.flush({
+      items: [
+        {
+          targetId: 'target-alpha',
+          name: 'api-alpha',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          hostId: 'host-alpha',
+          agentId: 'agent-alpha',
+          targetType: 'docker_host',
+          healthStatus: 'healthy',
+          componentVersionId: 'cmp-alpha',
+          imageDigest: 'sha256:alpha',
+          releaseId: 'rel-1',
+          releaseVersionId: 'rel-a',
+          lastSyncAt: '2026-03-31T10:00:00Z',
+        },
+      ],
+    });
+
+    fixture.detectChanges();
+
+    const text = fixture.nativeElement.textContent as string;
+    expect(text).toContain('Runtime Probe');
+    expect(text).toContain('No runtime probe heartbeat is currently bound to this host.');
+    expect(text).toContain('Connection Profile');
+    expect(text).toContain('Mapped Targets');
+    expect(text).toContain('Recent Activity');
+    expect(text).toContain('STELLA_HOST=alpha.stella.local');
+    expect(fixture.nativeElement.querySelector('app-copy-to-clipboard')).toBeTruthy();
+  });
+});

src/Web/StellaOps.Web/src/app/core/testing/topology-hosts-page.component.spec.ts

@@ -0,0 +1,147 @@
+import { provideHttpClient, withInterceptorsFromDi } from '@angular/common/http';
+import { HttpTestingController, provideHttpClientTesting } from '@angular/common/http/testing';
+import { TestBed } from '@angular/core/testing';
+import { ActivatedRoute, convertToParamMap, provideRouter } from '@angular/router';
+import { BehaviorSubject } from 'rxjs';
+
+import { PlatformContextStore } from '../../core/context/platform-context.store';
+import { TopologyHostsPageComponent } from '../../features/topology/topology-hosts-page.component';
+
+describe('TopologyHostsPageComponent', () => {
+  const queryParamMap$ = new BehaviorSubject(convertToParamMap({}));
+
+  let httpMock: HttpTestingController;
+
+  beforeEach(() => {
+    queryParamMap$.next(convertToParamMap({}));
+
+    TestBed.configureTestingModule({
+      imports: [TopologyHostsPageComponent],
+      providers: [
+        provideRouter([]),
+        provideHttpClient(withInterceptorsFromDi()),
+        provideHttpClientTesting(),
+        {
+          provide: ActivatedRoute,
+          useValue: {
+            queryParamMap: queryParamMap$.asObservable(),
+          },
+        },
+        {
+          provide: PlatformContextStore,
+          useValue: {
+            initialize: () => undefined,
+            contextVersion: () => 0,
+            selectedRegions: () => [],
+            selectedEnvironments: () => [],
+            regionSummary: () => 'All regions',
+            environmentSummary: () => 'All environments',
+          },
+        },
+      ],
+    });
+
+    httpMock = TestBed.inject(HttpTestingController);
+  });
+
+  afterEach(() => {
+    httpMock.verify();
+  });
+
+  it('renders runtime probe state and filters down to unmonitored hosts', () => {
+    const fixture = TestBed.createComponent(TopologyHostsPageComponent);
+    const component = fixture.componentInstance;
+    fixture.detectChanges();
+
+    const hostsReq = httpMock.expectOne((req) => req.url === '/api/v2/topology/hosts');
+    const targetsReq = httpMock.expectOne((req) => req.url === '/api/v2/topology/targets');
+
+    hostsReq.flush({
+      items: [
+        {
+          hostId: 'host-alpha',
+          hostName: 'alpha.stella.local',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          runtimeType: 'docker_host',
+          status: 'healthy',
+          agentId: 'agent-alpha',
+          targetCount: 1,
+          lastSeenAt: '2026-03-31T09:55:00Z',
+          probeStatus: 'active',
+          probeType: 'ebpf',
+          probeLastHeartbeat: '2026-03-31T10:00:00Z',
+        },
+        {
+          hostId: 'host-beta',
+          hostName: 'beta.stella.local',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          runtimeType: 'docker_host',
+          status: 'degraded',
+          agentId: 'agent-beta',
+          targetCount: 1,
+          lastSeenAt: '2026-03-31T09:40:00Z',
+          probeStatus: 'not_installed',
+          probeType: null,
+          probeLastHeartbeat: null,
+        },
+      ],
+    });
+
+    targetsReq.flush({
+      items: [
+        {
+          targetId: 'target-alpha',
+          name: 'api-alpha',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          hostId: 'host-alpha',
+          agentId: 'agent-alpha',
+          targetType: 'docker_host',
+          healthStatus: 'healthy',
+          componentVersionId: 'cmp-alpha',
+          imageDigest: 'sha256:alpha',
+          releaseId: 'rel-1',
+          releaseVersionId: 'rel-a',
+          lastSyncAt: '2026-03-31T10:00:00Z',
+        },
+        {
+          targetId: 'target-beta',
+          name: 'api-beta',
+          regionId: 'eu-west',
+          environmentId: 'prod',
+          hostId: 'host-beta',
+          agentId: 'agent-beta',
+          targetType: 'docker_host',
+          healthStatus: 'degraded',
+          componentVersionId: 'cmp-beta',
+          imageDigest: 'sha256:beta',
+          releaseId: 'rel-1',
+          releaseVersionId: 'rel-a',
+          lastSyncAt: '2026-03-31T09:45:00Z',
+        },
+      ],
+    });
+
+    fixture.detectChanges();
+
+    const text = fixture.nativeElement.textContent as string;
+    expect(text).toContain('Runtime Probe');
+    expect(text).toContain('Last Seen');
+    expect(text).toContain('Active');
+    expect(text).toContain('Not installed');
+    expect(text).toContain('eBPF');
+    expect(fixture.nativeElement.querySelector('.cell-host__link')).toBeTruthy();
+
+    const probeSelect = fixture.nativeElement.querySelector('#hosts-probe') as HTMLSelectElement;
+    probeSelect.value = 'unmonitored';
+    probeSelect.dispatchEvent(new Event('change'));
+    fixture.detectChanges();
+
+    expect(component.filteredHosts().map((item) => item.hostId)).toEqual(['host-beta']);
+    const tbodyText = fixture.nativeElement.querySelector('tbody')?.textContent ?? '';
+    expect(tbodyText).toContain('beta.stella.local');
+    expect(tbodyText).not.toContain('alpha.stella.local');
+  });
+});

src/Web/StellaOps.Web/src/app/features/topology/topology-environment-detail-page.component.ts

@@ -1,5 +1,5 @@
 import { HttpClient, HttpParams } from '@angular/common/http';
-import { ChangeDetectionStrategy, Component, computed, inject, signal } from '@angular/core';
+import { ChangeDetectionStrategy, Component, computed, DestroyRef, effect, inject, signal } from '@angular/core';
 import { ActivatedRoute, RouterLink } from '@angular/router';
 import { catchError, forkJoin, of, take } from 'rxjs';
 
@@ -25,11 +25,20 @@ import {
   TopologyPromotionPath,
   TopologyTarget,
 } from './topology.models';
+import {
+  buildRuntimeVerificationSummary,
+  dominantReleaseVersion,
+  runtimeVerificationTone,
+  shortDigest,
+  shortId,
+  type RuntimeVerificationStatus,
+} from './topology-runtime.helpers';
 import { StellaPageTabsComponent, StellaPageTab } from '../../shared/components/stella-page-tabs/stella-page-tabs.component';
 import { MetricCardComponent } from '../../shared/ui/metric-card/metric-card.component';
 import { StatusBadgeComponent } from '../../shared/ui/status-badge/status-badge.component';
 import { StatGroupComponent } from '../../shared/components/stat-card/stat-card.component';
 import { RelativeTimePipe, DurationPipe } from '../../shared/pipes/format.pipes';
+import { StellaHelperContextService } from '../../shared/components/stella-helper/stella-helper-context.service';
 
 type EnvironmentTab = 'overview' | 'targets' | 'readiness' | 'deployments' | 'agents' | 'security' | 'evidence' | 'drift' | 'data-quality';
 
@@ -70,9 +79,9 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
   template: `
     <section class="env-detail">
 
-      <!-- ── Header ── -->
+      <!-- Header -->
       <header class="hdr">
-        <a class="hdr__back" routerLink="/environments/overview">← Environments</a>
+        <a class="hdr__back" routerLink="/environments/overview">&lt;- Environments</a>
         <div class="hdr__main">
           <div class="hdr__title-row">
             <h1>{{ environmentLabel() }}</h1>
@@ -80,12 +89,12 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
             @if (currentRelease()) { <span class="chip chip--release">{{ currentRelease() }}</span> }
             @if (isFrozen()) { <app-status-badge status="error" label="FROZEN" [showIcon]="true" size="sm" /> }
           </div>
-          <p class="hdr__sub">{{ regionLabel() }} · {{ environmentTypeLabel() }}</p>
+          <p class="hdr__sub">{{ regionLabel() }} | {{ environmentTypeLabel() }}</p>
           @if (promotionLine()) { <p class="hdr__promo">{{ promotionLine() }}</p> }
         </div>
         <div class="hdr__actions">
-          <button class="btn btn--secondary btn--sm" (click)="refresh()">⟳ Refresh</button>
-          <a class="btn btn--primary btn--sm" [routerLink]="['/releases/deployments/new']" [queryParams]="{ environment: environmentId() }">Deploy</a>
+          <button class="btn btn--secondary btn--sm" (click)="refresh()">Refresh</button>
+          <a class="btn btn--primary btn--sm" [routerLink]="['/releases/promotions/create']" [queryParams]="{ targetEnvironmentId: environmentId() }">Request Promotion</a>
         </div>
       </header>
 
@@ -104,7 +113,7 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
       } @else {
         @switch (activeTab()) {
 
-          <!-- ════════ OVERVIEW ════════ -->
+          <!-- Overview -->
           @case ('overview') {
             <div class="overview-layout">
               <div class="overview-main">
@@ -135,7 +144,7 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
                   <article class="panel">
                     <div class="panel__hdr">
                       <h2>Readiness Snapshot</h2>
-                      <a class="panel__link" (click)="activeTab.set('readiness')">View full →</a>
+                      <a class="panel__link" (click)="activeTab.set('readiness')">View full -></a>
                     </div>
                     <div class="readiness-mini">
                       <span class="rm rm--ok">{{ readyTargetsCnt() }} pass</span>
@@ -170,30 +179,67 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
             </div>
           }
 
-          <!-- ════════ TARGETS ════════ -->
+          <!-- Targets -->
           @case ('targets') {
-            <article class="panel">
-              <table class="stella-table stella-table--striped stella-table--hoverable">
-                <thead><tr><th>Target</th><th>Type</th><th>Host</th><th>Agent</th><th>Status</th><th>Last Sync</th></tr></thead>
-                <tbody>
-                  @for (t of targetRows(); track t.targetId) {
-                    <tr>
-                      <td>{{ t.name }}</td>
-                      <td>{{ t.targetType }}</td>
-                      <td>{{ hostName(t.hostId) }}</td>
-                      <td>{{ agentName(t.agentId) }}</td>
-                      <td><app-status-badge [status]="healthToStatus(t.healthStatus)" [label]="t.healthStatus" [showIcon]="true" size="sm" /></td>
-                      <td>{{ t.lastSyncAt | relativeTime }}</td>
-                    </tr>
-                  } @empty {
-                    <tr><td colspan="6" class="muted">No targets in this environment.</td></tr>
-                  }
-                </tbody>
-              </table>
-            </article>
+            <app-stat-group columns="4">
+              <app-metric-card label="Verified" [value]="runtimeVerifiedCount()" [severity]="runtimeVerifiedCount() === targetRows().length && targetRows().length > 0 ? 'healthy' : 'warning'" />
+              <app-metric-card label="Drift" [value]="runtimeDriftCount()" [severity]="runtimeDriftCount() > 0 ? 'warning' : 'healthy'" />
+              <app-metric-card label="Probe Offline" [value]="runtimeOfflineCount()" [severity]="runtimeOfflineCount() > 0 ? 'critical' : 'healthy'" />
+              <app-metric-card label="Not Monitored" [value]="runtimeUnmonitoredCount()" [severity]="runtimeUnmonitoredCount() > 0 ? 'warning' : 'healthy'" />
+            </app-stat-group>
+
+            @if (targetRows().length === 0) {
+              <article class="panel panel--empty">
+                <div class="empty-panel">
+                  <div class="empty-panel__icon" aria-hidden="true">O</div>
+                  <div class="empty-panel__body">
+                    <h3>No targets are mapped to this environment yet</h3>
+                    <p>
+                      Targets appear after Stella has discovered runtime hosts and associated workloads with this environment.
+                      Until that happens, readiness checks, drift detection, and deployment health all stay empty here.
+                    </p>
+                  </div>
+                  <div class="empty-panel__actions">
+                    <a class="btn btn--primary btn--sm" [routerLink]="['/environments/targets']" [queryParams]="{ environment: environmentId() }">Review target inventory</a>
+                    <a class="btn btn--secondary btn--sm" [routerLink]="['/ops/integrations']">Open integrations</a>
+                  </div>
+                </div>
+              </article>
+            } @else {
+              <article class="panel">
+                <p class="runtime-note">
+                  Runtime state combines host probe heartbeat plus the dominant deployed release version for this environment. Missing probe data renders as Not monitored.
+                </p>
+                <table class="stella-table stella-table--striped stella-table--hoverable">
+                  <thead><tr><th>Target</th><th>Type</th><th>Host</th><th>Agent</th><th>Status</th><th>Runtime</th><th>Last Sync</th></tr></thead>
+                  <tbody>
+                    @for (row of runtimeVerificationRows(); track row.target.targetId) {
+                      <tr
+                        [class.runtime-row--drift]="row.summary.status === 'drift'"
+                        [class.runtime-row--offline]="row.summary.status === 'offline'"
+                        [class.runtime-row--unmonitored]="row.summary.status === 'not_monitored'"
+                      >
+                        <td>{{ row.target.name }}</td>
+                        <td>{{ row.target.targetType }}</td>
+                        <td>{{ hostName(row.target.hostId) }}</td>
+                        <td>{{ agentName(row.target.agentId) }}</td>
+                        <td><app-status-badge [status]="healthToStatus(row.target.healthStatus)" [label]="row.target.healthStatus" [showIcon]="true" size="sm" /></td>
+                        <td>
+                          <div class="runtime-cell" [title]="row.summary.detail">
+                            <app-status-badge [status]="runtimeStatusTone(row.summary.status)" [label]="row.summary.label" [showIcon]="true" size="sm" />
+                            <span class="runtime-caption">{{ row.summary.probeTypeLabel }}</span>
+                          </div>
+                        </td>
+                        <td>{{ row.target.lastSyncAt | relativeTime }}</td>
+                      </tr>
+                    }
+                  </tbody>
+                </table>
+              </article>
+            }
           }
 
-          <!-- ════════ READINESS ════════ -->
+          <!-- Readiness -->
           @case ('readiness') {
             <app-stat-group columns="3">
               <app-metric-card label="Ready" [value]="readyTargetsCnt()" [severity]="readyTargetsCnt() === readinessReports().length ? 'healthy' : 'warning'" />
@@ -201,49 +247,77 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
               <app-metric-card label="Pending" [value]="pendingTargetsCnt()" [severity]="pendingTargetsCnt() > 0 ? 'warning' : 'healthy'" />
             </app-stat-group>
 
-            <article class="panel">
-              <div class="panel__hdr">
-                <h2>Gate Status</h2>
-                <button class="btn btn--primary btn--sm" (click)="validateAll()" [disabled]="validatingAll()">
-                  {{ validatingAll() ? 'Validating...' : 'Validate All' }}
-                </button>
-              </div>
-              <div class="gg-wrap">
-                <table class="stella-table stella-table--striped stella-table--hoverable">
-                  <thead>
-                    <tr>
-                      <th>Target</th>
-                      @for (gn of gateNames; track gn) { <th class="th-gate">{{ fmtGate(gn) }}</th> }
-                      <th>Ready</th>
-                      <th>Actions</th>
-                    </tr>
-                  </thead>
-                  <tbody>
-                    @for (rpt of readinessReports(); track rpt.targetId) {
-                      <tr>
-                        <td>{{ targetName(rpt.targetId) }}</td>
-                        @for (gn of gateNames; track gn) {
-                          <td class="td-gate">
-                            <app-status-badge [status]="gateStatus(rpt, gn)" [label]="gateLabel(rpt, gn)" size="sm" />
-                          </td>
-                        }
-                        <td><app-status-badge [status]="rpt.isReady ? 'success' : 'error'" [label]="rpt.isReady ? 'Yes' : 'No'" [showIcon]="true" size="sm" /></td>
-                        <td>
-                          <button class="btn btn--secondary btn--xs" (click)="validateTarget(rpt.targetId)" [disabled]="validating().has(rpt.targetId)">
-                            {{ validating().has(rpt.targetId) ? '...' : 'Validate' }}
-                          </button>
-                        </td>
-                      </tr>
-                    } @empty {
-                      <tr><td [attr.colspan]="gateNames.length + 3" class="muted">No readiness data. Run validation to check targets.</td></tr>
+            @if (readinessReports().length === 0) {
+              <article class="panel panel--empty">
+                <div class="empty-panel">
+                  <div class="empty-panel__icon" aria-hidden="true">OK</div>
+                  <div class="empty-panel__body">
+                    <h3>No readiness checks have been captured yet</h3>
+                    <p>
+                      Readiness records show whether agents are bound, registries are reachable, and connectivity gates are passing for each target.
+                      @if (targetRows().length === 0) {
+                        Add targets to this environment first, then Stella can validate promotion readiness.
+                      } @else {
+                        Run validation once to populate the gate matrix before reviewing or promoting this environment.
+                      }
+                    </p>
+                  </div>
+                  <div class="empty-panel__actions">
+                    @if (targetRows().length === 0) {
+                      <a class="btn btn--primary btn--sm" [routerLink]="['/environments/targets']" [queryParams]="{ environment: environmentId() }">Review targets</a>
+                      <a class="btn btn--secondary btn--sm" [routerLink]="['/ops/integrations']">Open integrations</a>
+                    } @else {
+                      <button class="btn btn--primary btn--sm" (click)="validateAll()" [disabled]="validatingAll()">
+                        {{ validatingAll() ? 'Validating...' : 'Validate All' }}
+                      </button>
+                      <button class="btn btn--secondary btn--sm" (click)="activeTab.set('targets')">Inspect targets</button>
                     }
-                  </tbody>
-                </table>
-              </div>
-            </article>
+                  </div>
+                </div>
+              </article>
+            } @else {
+              <article class="panel">
+                <div class="panel__hdr">
+                  <h2>Gate Status</h2>
+                  <button class="btn btn--primary btn--sm" (click)="validateAll()" [disabled]="validatingAll()">
+                    {{ validatingAll() ? 'Validating...' : 'Validate All' }}
+                  </button>
+                </div>
+                <div class="gg-wrap">
+                  <table class="stella-table stella-table--striped stella-table--hoverable">
+                    <thead>
+                      <tr>
+                        <th>Target</th>
+                        @for (gn of gateNames; track gn) { <th class="th-gate">{{ fmtGate(gn) }}</th> }
+                        <th>Ready</th>
+                        <th>Actions</th>
+                      </tr>
+                    </thead>
+                    <tbody>
+                      @for (rpt of readinessReports(); track rpt.targetId) {
+                        <tr>
+                          <td>{{ targetName(rpt.targetId) }}</td>
+                          @for (gn of gateNames; track gn) {
+                            <td class="td-gate">
+                              <app-status-badge [status]="gateStatus(rpt, gn)" [label]="gateLabel(rpt, gn)" size="sm" />
+                            </td>
+                          }
+                          <td><app-status-badge [status]="rpt.isReady ? 'success' : 'error'" [label]="rpt.isReady ? 'Yes' : 'No'" [showIcon]="true" size="sm" /></td>
+                          <td>
+                            <button class="btn btn--secondary btn--xs" (click)="validateTarget(rpt.targetId)" [disabled]="validating().has(rpt.targetId)">
+                              {{ validating().has(rpt.targetId) ? '...' : 'Validate' }}
+                            </button>
+                          </td>
+                        </tr>
+                      }
+                    </tbody>
+                  </table>
+                </div>
+              </article>
+            }
           }
 
-          <!-- ════════ RUNS ════════ -->
+          <!-- Runs -->
           @case ('deployments') {
             <article class="panel">
               <table class="stella-table stella-table--striped stella-table--hoverable">
@@ -253,9 +327,9 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
                     <tr>
                       <td>{{ run.releaseName }}</td>
                       <td><app-status-badge [status]="runStatusType(run.status)" [label]="run.status" size="sm" /></td>
-                      <td>{{ run.durationMs ? (run.durationMs | duration) : '—' }}</td>
+                      <td>{{ run.durationMs ? (run.durationMs | duration) : '-' }}</td>
                       <td>{{ run.occurredAt | relativeTime }}</td>
-                      <td><a class="link" [routerLink]="['/releases/runs', run.activityId, 'summary']">View →</a></td>
+                      <td><a class="link" [routerLink]="['/releases/runs', run.activityId, 'summary']">View -></a></td>
                     </tr>
                   } @empty {
                     <tr><td colspan="5" class="muted">No deployment runs in this scope.</td></tr>
@@ -265,29 +339,46 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
             </article>
           }
 
-          <!-- ════════ AGENTS ════════ -->
+          <!-- Agents -->
           @case ('agents') {
-            <article class="panel">
-              <table class="stella-table stella-table--striped stella-table--hoverable">
-                <thead><tr><th>Agent</th><th>Status</th><th>Capabilities</th><th>Targets</th><th>Heartbeat</th></tr></thead>
-                <tbody>
-                  @for (a of agentRows(); track a.agentId) {
-                    <tr>
-                      <td>{{ a.agentName }}</td>
-                      <td><app-status-badge [status]="a.status === 'active' ? 'success' : 'warning'" [label]="a.status" [showIcon]="true" size="sm" /></td>
-                      <td>{{ a.capabilities.join(', ') || '—' }}</td>
-                      <td>{{ a.assignedTargetCount }}</td>
-                      <td>{{ a.lastHeartbeatAt | relativeTime }}</td>
-                    </tr>
-                  } @empty {
-                    <tr><td colspan="5" class="muted">No agents in this environment.</td></tr>
-                  }
-                </tbody>
-              </table>
-            </article>
+            @if (agentRows().length === 0) {
+              <article class="panel panel--empty">
+                <div class="empty-panel">
+                  <div class="empty-panel__icon" aria-hidden="true">CFG</div>
+                  <div class="empty-panel__body">
+                    <h3>No agents are reporting for this environment</h3>
+                    <p>
+                      Agents are what let Stella validate readiness and execute deployments on real hosts.
+                      Until an agent is connected here, this environment can describe topology but cannot perform release work.
+                    </p>
+                  </div>
+                  <div class="empty-panel__actions">
+                    <a class="btn btn--primary btn--sm" [routerLink]="['/ops/operations/agents']">Open agent fleet</a>
+                    <a class="btn btn--secondary btn--sm" [routerLink]="['/ops/operations/doctor']">Run diagnostics</a>
+                  </div>
+                </div>
+              </article>
+            } @else {
+              <article class="panel">
+                <table class="stella-table stella-table--striped stella-table--hoverable">
+                  <thead><tr><th>Agent</th><th>Status</th><th>Capabilities</th><th>Targets</th><th>Heartbeat</th></tr></thead>
+                  <tbody>
+                    @for (a of agentRows(); track a.agentId) {
+                      <tr>
+                        <td>{{ a.agentName }}</td>
+                        <td><app-status-badge [status]="a.status === 'active' ? 'success' : 'warning'" [label]="a.status" [showIcon]="true" size="sm" /></td>
+                        <td>{{ a.capabilities.join(', ') || '-' }}</td>
+                        <td>{{ a.assignedTargetCount }}</td>
+                        <td>{{ a.lastHeartbeatAt | relativeTime }}</td>
+                      </tr>
+                    }
+                  </tbody>
+                </table>
+              </article>
+            }
           }
 
-          <!-- ════════ SECURITY ════════ -->
+          <!-- Security -->
           @case ('security') {
             <article class="panel">
               <table class="stella-table stella-table--striped stella-table--hoverable">
@@ -297,14 +388,14 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
                     <tr>
                       <td class="mono">{{ f.cveId }}</td>
                       <td><app-status-badge [status]="severityStatus(f.severity)" [label]="f.severity" [showIcon]="true" size="sm" /></td>
-                      <td>{{ f.cvss ?? '—' }}</td>
+                      <td>{{ f.cvss ?? '-' }}</td>
                       <td>
                         @if (f.reachable != null) {
                           <app-status-badge [status]="f.reachable ? 'error' : 'neutral'" [label]="f.reachable ? 'Yes' : 'No'" size="sm" />
-                        } @else { — }
+                        } @else { - }
                       </td>
                       <td>{{ f.effectiveDisposition }}</td>
-                      <td><a class="link" [routerLink]="['/triage/artifacts']" [queryParams]="{ cve: f.cveId }">View →</a></td>
+                      <td><a class="link" [routerLink]="['/triage/artifacts']" [queryParams]="{ cve: f.cveId }">View -></a></td>
                     </tr>
                   } @empty {
                     <tr><td colspan="6" class="muted">No active findings in this scope.</td></tr>
@@ -314,7 +405,7 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
             </article>
           }
 
-          <!-- ════════ EVIDENCE ════════ -->
+          <!-- Evidence -->
           @case ('evidence') {
             @if (capsuleRows().length === 0) {
               <div class="panel"><p class="muted">No decision capsules in this scope.</p></div>
@@ -348,7 +439,7 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
             }
           }
 
-          <!-- ════════ DRIFT ════════ -->
+          <!-- Drift -->
           @case ('drift') {
             <article class="panel">
               @if (driftDetected()) {
@@ -365,9 +456,74 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
                 </div>
               }
             </article>
+
+            <article class="panel">
+              <div class="panel__hdr">
+                <div>
+                  <h2>Runtime Verification</h2>
+                  <p class="runtime-note">
+                    Probe-backed runtime status is shown here. True running-vs-deployed container digest comparison is not available until the backend exposes running inventory evidence.
+                  </p>
+                </div>
+                <button class="btn btn--secondary btn--xs" (click)="runtimeSectionExpanded.set(!runtimeSectionExpanded())">
+                  {{ runtimeSectionExpanded() ? 'Collapse' : 'Expand' }}
+                </button>
+              </div>
+
+              <div class="runtime-summary">
+                <span class="runtime-summary__item runtime-summary__item--verified">{{ runtimeVerifiedCount() }} verified</span>
+                <span class="runtime-summary__item runtime-summary__item--drift">{{ runtimeDriftCount() }} drift</span>
+                <span class="runtime-summary__item runtime-summary__item--offline">{{ runtimeOfflineCount() }} offline</span>
+                <span class="runtime-summary__item runtime-summary__item--unmonitored">{{ runtimeUnmonitoredCount() }} not monitored</span>
+              </div>
+
+              @if (runtimeSectionExpanded()) {
+                <div class="runtime-matrix-wrap">
+                  <table class="stella-table stella-table--striped stella-table--hoverable">
+                    <thead>
+                      <tr>
+                        <th>Target</th>
+                        <th>Host</th>
+                        <th>Probe</th>
+                        <th>Expected Release</th>
+                        <th>Observed Release</th>
+                        <th>Image Digest</th>
+                        <th>Runtime</th>
+                      </tr>
+                    </thead>
+                    <tbody>
+                      @for (row of runtimeVerificationRows(); track row.target.targetId) {
+                        <tr
+                          [class.runtime-row--drift]="row.summary.status === 'drift'"
+                          [class.runtime-row--offline]="row.summary.status === 'offline'"
+                          [class.runtime-row--unmonitored]="row.summary.status === 'not_monitored'"
+                        >
+                          <td>{{ row.target.name }}</td>
+                          <td>{{ hostName(row.target.hostId) }}</td>
+                          <td>{{ row.summary.probeTypeLabel }}</td>
+                          <td class="mono" [title]="row.summary.expectedReleaseVersion">{{ shortId(row.summary.expectedReleaseVersion) }}</td>
+                          <td class="mono" [title]="row.summary.observedReleaseVersion">{{ shortId(row.summary.observedReleaseVersion) }}</td>
+                          <td class="mono" [title]="row.target.imageDigest">{{ shortDigest(row.target.imageDigest) }}</td>
+                          <td>
+                            <div class="runtime-cell" [title]="row.summary.detail">
+                              <app-status-badge [status]="runtimeStatusTone(row.summary.status)" [label]="row.summary.label" [showIcon]="true" size="sm" />
+                              @if (row.summary.lastVerifiedAt) {
+                                <span class="runtime-caption">{{ row.summary.lastVerifiedAt | relativeTime }}</span>
+                              }
+                            </div>
+                          </td>
+                        </tr>
+                      } @empty {
+                        <tr><td colspan="7" class="muted">No target runtime verification data in this scope.</td></tr>
+                      }
+                    </tbody>
+                  </table>
+                </div>
+              }
+            </article>
           }
 
-          <!-- ════════ DATA QUALITY ════════ -->
+          <!-- Data quality -->
           @case ('data-quality') {
             <app-stat-group columns="4">
               <app-metric-card label="Target Coverage" [value]="targetRows().length" [severity]="targetRows().length === 0 ? 'critical' : 'healthy'" subtitle="Topology targets in scope" />
@@ -383,7 +539,7 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
   styles: [`
     .env-detail { display: grid; gap: 0.75rem; }
 
-    /* ── Header ── */
+    /* Header */
     .hdr { display: grid; gap: 0.25rem; padding: 0.6rem 0.75rem; border: 1px solid var(--color-border-primary); border-radius: var(--radius-md); background: var(--color-surface-primary); }
     .hdr__back { font-size: 0.72rem; color: var(--color-text-link, var(--color-brand, #3b82f6)); text-decoration: none; }
     .hdr__back:hover { text-decoration: underline; }
@@ -395,7 +551,7 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
     .hdr__actions { display: flex; gap: 0.35rem; align-items: center; justify-content: flex-end; }
     .chip--release { font-size: 0.66rem; padding: 0.1rem 0.35rem; border-radius: var(--radius-sm); background: var(--color-surface-secondary); color: var(--color-text-secondary); font-family: var(--font-mono, monospace); }
 
-    /* ── Buttons ── */
+    /* Buttons */
     .btn { padding: 0.3rem 0.65rem; border-radius: var(--radius-sm); cursor: pointer; font-size: 0.74rem; font-weight: 500; border: none; text-decoration: none; display: inline-flex; align-items: center; gap: 0.2rem; transition: background 150ms ease; }
     .btn--sm { padding: 0.28rem 0.6rem; }
     .btn--xs { padding: 0.2rem 0.4rem; font-size: 0.68rem; }
@@ -409,33 +565,54 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
     .link:hover { text-decoration: underline; }
     .mono { font-family: var(--font-mono, monospace); font-size: 0.72rem; }
 
-    /* ── Panels ── */
+    /* Panels */
     .panel { border: 1px solid var(--color-border-primary); border-radius: var(--radius-md); background: var(--color-surface-primary); padding: 0.7rem; display: grid; gap: 0.4rem; }
+    .panel--empty { padding: 0.85rem; }
     .panel h2 { margin: 0; font-size: 0.88rem; font-weight: 600; }
     .panel__hdr { display: flex; justify-content: space-between; align-items: center; }
     .panel__link { font-size: 0.72rem; color: var(--color-text-link, var(--color-brand, #3b82f6)); cursor: pointer; text-decoration: none; }
     .panel__link:hover { text-decoration: underline; }
     .panel__ok { margin: 0; color: var(--color-status-success, #22c55e); font-size: 0.76rem; }
+    .empty-panel { display: grid; gap: 0.75rem; align-items: start; }
+    .empty-panel__icon {
+      width: 2rem;
+      height: 2rem;
+      border-radius: 999px;
+      display: inline-flex;
+      align-items: center;
+      justify-content: center;
+      background: color-mix(in srgb, var(--color-brand-soft, rgba(59,130,246,0.12)) 75%, transparent);
+      color: var(--color-text-link, var(--color-brand, #3b82f6));
+      font-size: 1rem;
+      font-weight: 700;
+    }
+    .empty-panel__body { display: grid; gap: 0.35rem; }
+    .empty-panel__body h3 { margin: 0; font-size: 0.9rem; font-weight: 600; }
+    .empty-panel__body p { margin: 0; color: var(--color-text-secondary); font-size: 0.76rem; line-height: 1.5; }
+    .empty-panel__actions { display: flex; flex-wrap: wrap; gap: 0.45rem; }
     .banner { border: 1px solid var(--color-border-primary); border-radius: var(--radius-md); padding: 0.5rem 0.65rem; font-size: 0.78rem; }
     .banner--error { color: var(--color-status-error-text, #ef4444); background: var(--color-status-error-bg, rgba(239,68,68,0.06)); }
     .muted { color: var(--color-text-muted); font-size: 0.74rem; }
+    .runtime-note { margin: 0; color: var(--color-text-secondary); font-size: 0.74rem; line-height: 1.45; }
+    .runtime-cell { display: inline-flex; flex-direction: column; align-items: flex-start; gap: 0.15rem; }
+    .runtime-caption { color: var(--color-text-muted); font-size: 0.64rem; }
 
-    /* ── Overview 2-column layout ── */
+    /* Overview 2-column layout */
     .overview-layout { display: grid; grid-template-columns: 2fr 1fr; gap: 0.65rem; }
     .overview-main { display: grid; gap: 0.65rem; }
     .overview-side { display: grid; gap: 0.65rem; align-content: start; }
 
-    /* ── Blocker list ── */
+    /* Blocker list */
     .blocker-list { display: grid; gap: 0.3rem; }
     .blocker-item { display: flex; align-items: center; gap: 0.4rem; font-size: 0.76rem; }
 
-    /* ── Readiness mini ── */
+    /* Readiness mini */
     .readiness-mini { display: flex; gap: 0.75rem; font-size: 0.78rem; font-weight: 600; }
     .rm--ok { color: var(--color-status-success, #22c55e); }
     .rm--fail { color: var(--color-status-error, #ef4444); }
     .rm--pend { color: var(--color-status-warning, #f59e0b); }
 
-    /* ── Health circle ── */
+    /* Health circle */
     .health-circle-panel { display: flex; justify-content: center; padding: 1rem; }
     .health-circle {
       width: 80px; height: 80px; border-radius: 50%;
@@ -448,18 +625,18 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
     .health-circle__num { font-size: 1.1rem; font-weight: 700; line-height: 1; }
     .health-circle__label { font-size: 0.6rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.04em; }
 
-    /* ── Quick stats ── */
+    /* Quick stats */
     .quick-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.35rem; text-align: center; }
     .qs { display: flex; flex-direction: column; align-items: center; }
     .qs__v { font-size: 1rem; font-weight: 700; color: var(--color-text-heading); }
     .qs__l { font-size: 0.6rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.04em; }
 
-    /* ── Gate grid ── */
+    /* Gate grid */
     .gg-wrap { overflow-x: auto; }
     .th-gate, .td-gate { text-align: center; font-size: 0.68rem; }
     .th-gate { font-size: 0.6rem; text-transform: uppercase; letter-spacing: 0.03em; }
 
-    /* ── Evidence grid ── */
+    /* Evidence grid */
     .evidence-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 0.5rem; }
     .ev-card { border: 1px solid var(--color-border-primary); border-radius: var(--radius-md); background: var(--color-surface-primary); padding: 0.55rem; display: grid; gap: 0.3rem; }
     .ev-card__hdr { display: flex; justify-content: space-between; align-items: center; }
@@ -470,12 +647,30 @@ function severityToStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' {
     .ev-card__date { font-size: 0.66rem; color: var(--color-text-muted); }
     .ev-card__foot { display: flex; gap: 0.3rem; }
 
-    /* ── Drift ── */
+    /* Drift */
     .drift-alert { padding: 0.5rem; background: var(--color-status-warning-bg, rgba(245,158,11,0.08)); border-radius: var(--radius-sm); }
     .drift-alert__msg { display: flex; align-items: flex-start; gap: 0.5rem; }
     .drift-alert__msg p { margin: 0; font-size: 0.76rem; color: var(--color-text-secondary); }
     .drift-ok { display: flex; align-items: center; gap: 0.5rem; }
     .drift-ok p { margin: 0; font-size: 0.76rem; color: var(--color-text-secondary); }
+    .runtime-summary { display: flex; flex-wrap: wrap; gap: 0.35rem; }
+    .runtime-summary__item {
+      display: inline-flex;
+      align-items: center;
+      border: 1px solid var(--color-border-primary);
+      border-radius: var(--radius-full);
+      padding: 0.12rem 0.45rem;
+      font-size: 0.68rem;
+      font-weight: 600;
+    }
+    .runtime-summary__item--verified { background: var(--color-status-success-bg, rgba(34,197,94,0.08)); color: var(--color-status-success-text, #15803d); }
+    .runtime-summary__item--drift { background: var(--color-status-warning-bg, rgba(245,158,11,0.1)); color: var(--color-status-warning-text, #b45309); }
+    .runtime-summary__item--offline { background: var(--color-status-error-bg, rgba(239,68,68,0.08)); color: var(--color-status-error-text, #b91c1c); }
+    .runtime-summary__item--unmonitored { background: var(--color-surface-secondary); color: var(--color-text-secondary); }
+    .runtime-matrix-wrap { overflow-x: auto; }
+    .runtime-row--drift { background: var(--color-status-warning-bg, rgba(245,158,11,0.1)); }
+    .runtime-row--offline { background: var(--color-status-error-bg, rgba(239,68,68,0.08)); }
+    .runtime-row--unmonitored { background: var(--color-surface-secondary); }
 
     @media (max-width: 1024px) {
       .overview-layout { grid-template-columns: 1fr; }
@@ -488,6 +683,8 @@ export class TopologyEnvironmentDetailPageComponent {
   private readonly topologySetup = inject(TopologySetupClient);
   private readonly http = inject(HttpClient);
   private readonly route = inject(ActivatedRoute);
+  private readonly destroyRef = inject(DestroyRef);
+  private readonly helperCtx = inject(StellaHelperContextService);
   readonly context = inject(PlatformContextStore);
 
   readonly gateNames = GATE_NAMES;
@@ -514,20 +711,53 @@ export class TopologyEnvironmentDetailPageComponent {
   readonly currentRelease = signal<string | null>(null);
   readonly validating = signal<Set<string>>(new Set());
   readonly validatingAll = signal(false);
+  readonly runtimeSectionExpanded = signal(true);
 
-  // ── Lookup maps ──
+  // Lookup maps
+  readonly hostMap = computed(() => new Map(this.hostRows().map(h => [h.hostId, h])));
   readonly hostNameMap = computed(() => new Map(this.hostRows().map(h => [h.hostId, h.hostName])));
   readonly agentNameMap = computed(() => new Map(this.agentRows().map(a => [a.agentId, a.agentName])));
   readonly targetNameMap = computed(() => new Map(this.targetRows().map(t => [t.targetId, t.name])));
   readonly envNameMap = computed(() => new Map(this.allEnvironments().map(e => [e.environmentId, e.displayName])));
 
-  // ── Health computeds ──
+  // Health computeds
   readonly healthyTargets = computed(() => this.targetRows().filter(t => t.healthStatus.trim().toLowerCase() === 'healthy').length);
   readonly degradedTargets = computed(() => this.targetRows().filter(t => t.healthStatus.trim().toLowerCase() === 'degraded').length);
   readonly unhealthyTargets = computed(() => this.targetRows().filter(t => { const s = t.healthStatus.trim().toLowerCase(); return s === 'unhealthy' || s === 'offline' || s === 'unknown'; }).length);
+  readonly unknownHealthTargets = computed(() => this.targetRows().filter(t => t.healthStatus.trim().toLowerCase() === 'unknown').length);
   readonly blockingFindings = computed(() => this.findingRows().filter(f => f.effectiveDisposition.trim().toLowerCase() === 'action_required').length);
   readonly staleCapsules = computed(() => this.capsuleRows().filter(c => c.status.trim().toLowerCase().includes('stale')).length);
   readonly degradedAgents = computed(() => this.agentRows().filter(a => a.status.trim().toLowerCase() !== 'active').length);
+  readonly helperContexts = computed(() => {
+    const contexts: string[] = [];
+    if (this.blockingFindings() > 0) {
+      contexts.push('critical-open');
+    }
+    if (this.failingTargetsCnt() > 0) {
+      contexts.push('gate-blocked');
+    }
+    if (this.unknownHealthTargets() > 0) {
+      contexts.push('health-unknown');
+    }
+    if (this.degradedAgents() > 0) {
+      contexts.push('agents-degraded');
+    }
+    if (!this.loading() && this.agentRows().length === 0) {
+      contexts.push('agents-none');
+    }
+    if (!this.loading()) {
+      if (this.activeTab() === 'targets' && this.targetRows().length === 0) {
+        contexts.push('empty-table');
+      }
+      if (this.activeTab() === 'readiness' && this.readinessReports().length === 0) {
+        contexts.push('empty-table');
+      }
+      if (this.activeTab() === 'agents' && this.agentRows().length === 0) {
+        contexts.push('empty-table');
+      }
+    }
+    return contexts;
+  });
 
   readonly deployHealth = computed(() => {
     if (this.unhealthyTargets() > 0) return 'UNHEALTHY';
@@ -540,12 +770,12 @@ export class TopologyEnvironmentDetailPageComponent {
     return h === 'HEALTHY' ? 'success' : h === 'DEGRADED' ? 'warning' : 'error';
   });
 
-  // ── Readiness computeds ──
+  // Readiness computeds
   readonly readyTargetsCnt = computed(() => this.readinessReports().filter(r => r.isReady).length);
   readonly failingTargetsCnt = computed(() => this.readinessReports().filter(r => !r.isReady && r.gates.some(g => g.status === 'fail')).length);
   readonly pendingTargetsCnt = computed(() => this.readinessReports().filter(r => !r.isReady && r.gates.some(g => g.status === 'pending') && !r.gates.some(g => g.status === 'fail')).length);
 
-  // ── Drift ──
+  // Drift
   readonly driftDetected = computed(() => {
     const targets = this.targetRows();
     if (targets.length < 2) return false;
@@ -562,7 +792,30 @@ export class TopologyEnvironmentDetailPageComponent {
     return targets.length - maxCount;
   });
 
-  // ── Promotion context ──
+  // Promotion context
+  readonly expectedReleaseVersion = computed(() => dominantReleaseVersion(this.targetRows()));
+  readonly runtimeVerificationRows = computed(() =>
+    this.targetRows().map((target) => ({
+      target,
+      summary: buildRuntimeVerificationSummary(
+        target,
+        this.hostMap().get(target.hostId),
+        this.expectedReleaseVersion(),
+      ),
+    })),
+  );
+  readonly runtimeVerifiedCount = computed(() =>
+    this.runtimeVerificationRows().filter(row => row.summary.status === 'verified').length,
+  );
+  readonly runtimeDriftCount = computed(() =>
+    this.runtimeVerificationRows().filter(row => row.summary.status === 'drift').length,
+  );
+  readonly runtimeOfflineCount = computed(() =>
+    this.runtimeVerificationRows().filter(row => row.summary.status === 'offline').length,
+  );
+  readonly runtimeUnmonitoredCount = computed(() =>
+    this.runtimeVerificationRows().filter(row => row.summary.status === 'not_monitored').length,
+  );
   readonly promotionLine = computed(() => {
     const envId = this.environmentId();
     const paths = this.promotionPaths();
@@ -571,13 +824,13 @@ export class TopologyEnvironmentDetailPageComponent {
     const upstream = paths.filter(p => p.targetEnvironmentId === envId).map(p => names.get(p.sourceEnvironmentId) ?? p.sourceEnvironmentId);
     const downstream = paths.filter(p => p.sourceEnvironmentId === envId).map(p => names.get(p.targetEnvironmentId) ?? p.targetEnvironmentId);
     const parts: string[] = [];
-    if (upstream.length) parts.push(upstream.join(', ') + ' →');
+    if (upstream.length) parts.push(upstream.join(', ') + ' ->');
     parts.push(`[${this.environmentLabel()}]`);
-    if (downstream.length) parts.push('→ ' + downstream.join(', '));
+    if (downstream.length) parts.push('-> ' + downstream.join(', '));
     return parts.join(' ');
   });
 
-  // ── Blockers ──
+  // Blockers
   readonly blockers = computed(() => {
     const items: { severity: 'error' | 'warning'; text: string }[] = [];
     if (this.unhealthyTargets() > 0) items.push({ severity: 'error', text: `${this.unhealthyTargets()} unhealthy target(s) require runtime remediation.` });
@@ -588,7 +841,7 @@ export class TopologyEnvironmentDetailPageComponent {
     return items;
   });
 
-  // ── Tabs (dynamic status dots + badges) ──
+  // Tabs (dynamic status dots + badges)
   readonly tabDefs = computed((): StellaPageTab[] => [
     { id: 'overview', label: 'Overview', icon: 'M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z|||M12 12m-3 0a3 3 0 1 0 6 0 3 3 0 1 0-6 0', status: this.deployHealthStatus() === 'success' ? 'ok' : this.deployHealthStatus() === 'warning' ? 'warn' : 'error' },
     { id: 'targets', label: 'Targets', icon: 'M2 2h20v8H2z|||M2 14h20v8H2z|||M6 6h.01|||M6 18h.01', badge: this.targetRows().length || undefined },
@@ -607,13 +860,16 @@ export class TopologyEnvironmentDetailPageComponent {
     { label: 'Runs', route: '/releases/deployments', description: 'Deployment runs' },
   ]);
 
-  // ── Helpers ──
+  // Helpers
   hostName(id: string): string { return this.hostNameMap().get(id) ?? id.substring(0, 8) + '...'; }
   agentName(id: string): string { return this.agentNameMap().get(id) ?? id.substring(0, 8) + '...'; }
   targetName(id: string): string { return this.targetNameMap().get(id) ?? id.substring(0, 12); }
   healthToStatus(h: string): 'success' | 'warning' | 'error' | 'neutral' { return healthToStatus(h); }
   severityStatus(s: string): 'error' | 'warning' | 'info' | 'neutral' { return severityToStatus(s); }
   fmtGate(g: string): string { return fmtGateName(g); }
+  runtimeStatusTone(status: RuntimeVerificationStatus): 'success' | 'warning' | 'error' | 'neutral' { return runtimeVerificationTone(status); }
+  shortId(value: string | null | undefined): string { return shortId(value); }
+  shortDigest(value: string | null | undefined): string { return shortDigest(value); }
 
   gateStatus(rpt: ReadinessReport, gateName: string): 'success' | 'error' | 'warning' | 'neutral' {
     const gate = rpt.gates.find(x => x.gateName === gateName);
@@ -622,8 +878,8 @@ export class TopologyEnvironmentDetailPageComponent {
 
   gateLabel(rpt: ReadinessReport, gateName: string): string {
     const gate = rpt.gates.find(x => x.gateName === gateName);
-    if (!gate) return '—';
-    switch (gate.status) { case 'pass': return '✓'; case 'fail': return '✗'; case 'pending': return '●'; default: return '—'; }
+    if (!gate) return '-';
+    switch (gate.status) { case 'pass': return 'OK'; case 'fail': return 'Fail'; case 'pending': return 'Pending'; default: return '-'; }
   }
 
   runStatusType(status: string): 'success' | 'warning' | 'error' | 'neutral' {
@@ -634,10 +890,14 @@ export class TopologyEnvironmentDetailPageComponent {
     return 'neutral';
   }
 
-  // ── Lifecycle ──
+  // Lifecycle
 
   constructor() {
     this.context.initialize();
+    effect(() => {
+      this.helperCtx.setScope('topology-environment-detail', this.helperContexts());
+    }, { allowSignalWrites: true });
+    this.destroyRef.onDestroy(() => this.helperCtx.clearScope('topology-environment-detail'));
     this.route.paramMap.subscribe(params => {
       const id = params.get('environmentId') ?? '';
       this.environmentId.set(id);
@@ -697,8 +957,14 @@ export class TopologyEnvironmentDetailPageComponent {
           let best = ''; let bestCount = 0;
           for (const [v, c] of counts) if (c > bestCount) { best = v; bestCount = c; }
           this.currentRelease.set(best.substring(0, 12));
+        } else {
+          this.currentRelease.set(null);
         }
 
+        this.runtimeSectionExpanded.set(
+          this.driftDetected() || this.runtimeOfflineCount() > 0 || this.runtimeUnmonitoredCount() > 0,
+        );
+
         this.loading.set(false);
       },
       error: (err: unknown) => {
@@ -708,7 +974,7 @@ export class TopologyEnvironmentDetailPageComponent {
     });
   }
 
-  // ── Actions ──
+  // Actions
 
   validateTarget(targetId: string): void {
     const s = new Set(this.validating()); s.add(targetId); this.validating.set(s);

src/Web/StellaOps.Web/src/app/features/topology/topology-host-detail-page.component.ts

@@ -1,22 +1,698 @@
-import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
-import { ActivatedRoute } from '@angular/router';
+import { ChangeDetectionStrategy, Component, computed, inject, signal } from '@angular/core';
+import { ActivatedRoute, RouterLink } from '@angular/router';
+import { catchError, forkJoin, of, take } from 'rxjs';
+
+import { PlatformContextStore } from '../../core/context/platform-context.store';
+import { RelativeTimePipe } from '../../shared/pipes/format.pipes';
+import { CopyToClipboardComponent } from '../../shared/ui/copy-to-clipboard/copy-to-clipboard.component';
+import { StatusBadgeComponent } from '../../shared/ui/status-badge/status-badge.component';
+import { TopologyDataService } from './topology-data.service';
+import { TopologyHost, TopologyTarget } from './topology.models';
+import {
+  dominantReleaseVersion,
+  hasRuntimeProbe,
+  HostConnectionProfile,
+  inferConnectionProfile,
+  inferProbeRecommendation,
+  normalizeProbeStatus,
+  probeStatusLabel,
+  probeStatusTone,
+  probeTypeLabel,
+  shortDigest,
+  shortId,
+} from './topology-runtime.helpers';
+
+interface HostActivityRow {
+  targetId: string;
+  targetName: string;
+  lastSyncAt: string | null;
+  releaseVersionId: string | null;
+  imageDigest: string | null;
+  drifted: boolean;
+}
 
 @Component({
   selector: 'app-topology-host-detail-page',
   standalone: true,
-  changeDetection: ChangeDetectionStrategy.OnPush,
+  imports: [RouterLink, RelativeTimePipe, CopyToClipboardComponent, StatusBadgeComponent],
   template: `
-    <section class="topology-page">
-      <header>
-        <h1>Host {{ hostId }}</h1>
-        <p>Inventory, connectivity tests, mapped targets, and agent diagnostics.</p>
+    <section class="host-detail">
+      <header class="hero">
+        <div class="hero__nav">
+          <a routerLink="/environments/hosts" class="back-link">Back to Hosts</a>
+        </div>
+
+        @if (host()) {
+          <div class="hero__main">
+            <div>
+              <div class="hero__title-row">
+                <h1>{{ host()!.hostName }}</h1>
+                <app-status-badge [status]="hostStatusTone(host()!.status)" [label]="host()!.status" [showIcon]="true" size="sm" />
+                <app-status-badge [status]="probeTone()" [label]="probeLabel()" [showIcon]="true" size="sm" />
+              </div>
+              <p class="hero__subtitle">{{ host()!.regionId }} / {{ host()!.environmentId }} / {{ host()!.runtimeType }}</p>
+            </div>
+
+            <div class="hero__chips">
+              <span class="chip">Targets {{ hostTargets().length }}</span>
+              <span class="chip">Probe {{ probeType() }}</span>
+              <span class="chip">Last seen {{ lastSeenLabel() }}</span>
+            </div>
+          </div>
+        } @else {
+          <div class="hero__main">
+            <div>
+              <h1>Host {{ hostId() }}</h1>
+              <p class="hero__subtitle">Waiting for topology data.</p>
+            </div>
+          </div>
+        }
       </header>
+
+      @if (error()) {
+        <div class="banner banner--error">{{ error() }}</div>
+      }
+
+      @if (loading()) {
+        <div class="loading">Loading host detail...</div>
+      } @else if (!host()) {
+        <div class="empty-state">
+          <p>No topology host matched {{ hostId() }} in the current scope.</p>
+        </div>
+      } @else {
+        <div class="layout">
+          <article class="card">
+            <h2>Host Overview</h2>
+            <div class="meta-grid">
+              <span class="meta-grid__label">Host ID</span>
+              <span class="meta-grid__value mono">{{ host()!.hostId }}</span>
+
+              <span class="meta-grid__label">Region</span>
+              <span class="meta-grid__value">{{ host()!.regionId }}</span>
+
+              <span class="meta-grid__label">Environment</span>
+              <span class="meta-grid__value">{{ host()!.environmentId }}</span>
+
+              <span class="meta-grid__label">Runtime</span>
+              <span class="meta-grid__value">{{ host()!.runtimeType }}</span>
+
+              <span class="meta-grid__label">Agent</span>
+              <span class="meta-grid__value">{{ host()!.agentId || 'Not assigned' }}</span>
+
+              <span class="meta-grid__label">Last seen</span>
+              <span class="meta-grid__value">{{ host()!.lastSeenAt ? (host()!.lastSeenAt | relativeTime) : 'No host heartbeat yet' }}</span>
+            </div>
+          </article>
+
+          <article class="card">
+            <h2>Connection Profile</h2>
+            <div class="meta-grid">
+              <span class="meta-grid__label">Connection</span>
+              <span class="meta-grid__value">{{ connectionProfile().connectionLabel }}</span>
+
+              <span class="meta-grid__label">Endpoint</span>
+              <span class="meta-grid__value">{{ connectionProfile().endpointLabel }}</span>
+
+              <span class="meta-grid__label">Port / Profile</span>
+              <span class="meta-grid__value">{{ connectionProfile().portLabel }}</span>
+
+              <span class="meta-grid__label">Credential ref</span>
+              <span class="meta-grid__value">Not exposed by topology API</span>
+
+              <span class="meta-grid__label">Connection test</span>
+              <span class="meta-grid__value">Use mapped target validation until host-level test endpoints exist.</span>
+            </div>
+
+            <p class="summary">{{ connectionProfile().summary }}</p>
+
+            <div class="actions">
+              <a [routerLink]="['/environments', 'targets']" [queryParams]="{ hostId: host()!.hostId }">Open mapped targets</a>
+              <a [routerLink]="['/ops/operations/agents']" [queryParams]="{ agentId: host()!.agentId }">Open agent</a>
+            </div>
+          </article>
+
+          <article class="card card--wide">
+            <div class="card__header">
+              <div>
+                <h2>Mapped Targets</h2>
+                <p>{{ hostTargets().length }} target(s) currently mapped to this host.</p>
+              </div>
+            </div>
+
+            <table class="stella-table stella-table--striped stella-table--hoverable">
+              <thead>
+                <tr>
+                  <th>Target</th>
+                  <th>Type</th>
+                  <th>Status</th>
+                  <th>Release</th>
+                  <th>Image Digest</th>
+                  <th></th>
+                </tr>
+              </thead>
+              <tbody>
+                @for (target of hostTargets(); track target.targetId) {
+                  <tr>
+                    <td>{{ target.name }}</td>
+                    <td>{{ target.targetType }}</td>
+                    <td>
+                      <app-status-badge [status]="hostStatusTone(target.healthStatus)" [label]="target.healthStatus" [showIcon]="true" size="sm" />
+                    </td>
+                    <td class="mono" [title]="target.releaseVersionId">{{ shortId(target.releaseVersionId) }}</td>
+                    <td class="mono" [title]="target.imageDigest">{{ shortDigest(target.imageDigest) }}</td>
+                    <td><a [routerLink]="['/environments/targets', target.targetId]" class="link">Inspect</a></td>
+                  </tr>
+                } @empty {
+                  <tr>
+                    <td colspan="6" class="muted">No mapped targets for this host.</td>
+                  </tr>
+                }
+              </tbody>
+            </table>
+          </article>
+
+          <article class="card">
+            <div class="card__header">
+              <div>
+                <h2>Runtime Probe</h2>
+                <p>{{ probePanelSummary() }}</p>
+              </div>
+            </div>
+
+            @if (!hasProbe()) {
+              <div class="probe-empty">
+                <p>No runtime probe heartbeat is currently bound to this host.</p>
+                <div class="meta-grid">
+                  <span class="meta-grid__label">Recommended probe</span>
+                  <span class="meta-grid__value">{{ probeType() }}</span>
+
+                  <span class="meta-grid__label">Command shell</span>
+                  <span class="meta-grid__value">{{ connectionProfile().shell }}</span>
+                </div>
+
+                <label class="toggle">
+                  <input type="checkbox" [checked]="enableRuntimeVerification()" (change)="enableRuntimeVerification.set(!enableRuntimeVerification())" />
+                  <span>Include runtime verification flag in install command preview</span>
+                </label>
+
+                <div class="command-block">
+                  <code>{{ installCommand() }}</code>
+                  <app-copy-to-clipboard [value]="installCommand()" ariaLabel="Copy host install command" />
+                </div>
+              </div>
+            } @else {
+              <div class="meta-grid">
+                <span class="meta-grid__label">Probe status</span>
+                <span class="meta-grid__value">
+                  <app-status-badge [status]="probeTone()" [label]="probeLabel()" [showIcon]="true" size="sm" />
+                </span>
+
+                <span class="meta-grid__label">Probe type</span>
+                <span class="meta-grid__value">{{ probeType() }}</span>
+
+                <span class="meta-grid__label">Last heartbeat</span>
+                <span class="meta-grid__value">{{ probeLastHeartbeatLabel() }}</span>
+
+                <span class="meta-grid__label">Coverage proxy</span>
+                <span class="meta-grid__value">{{ hostTargets().length }} mapped target(s)</span>
+              </div>
+
+              <p class="summary">
+                Exact probe health metrics such as CPU overhead, buffer utilization, and events per second are not yet exposed by the topology read model.
+              </p>
+            }
+          </article>
+
+          <article class="card">
+            <div class="card__header">
+              <div>
+                <h2>Recent Activity</h2>
+                <p>Latest topology sync rows derived from mapped targets.</p>
+              </div>
+            </div>
+
+            <table class="stella-table stella-table--striped">
+              <thead>
+                <tr>
+                  <th>Target</th>
+                  <th>Last Sync</th>
+                  <th>Release</th>
+                  <th>Digest</th>
+                  <th>Drift</th>
+                </tr>
+              </thead>
+              <tbody>
+                @for (row of recentActivity(); track row.targetId) {
+                  <tr [class.activity-row--drift]="row.drifted">
+                    <td>{{ row.targetName }}</td>
+                    <td>{{ row.lastSyncAt ? (row.lastSyncAt | relativeTime) : 'Never' }}</td>
+                    <td class="mono" [title]="row.releaseVersionId">{{ shortId(row.releaseVersionId) }}</td>
+                    <td class="mono" [title]="row.imageDigest">{{ shortDigest(row.imageDigest) }}</td>
+                    <td>
+                      <app-status-badge
+                        [status]="row.drifted ? 'warning' : 'success'"
+                        [label]="row.drifted ? 'Drifted' : 'In sync'"
+                        size="sm"
+                      />
+                    </td>
+                  </tr>
+                } @empty {
+                  <tr>
+                    <td colspan="5" class="muted">No target activity for this host yet.</td>
+                  </tr>
+                }
+              </tbody>
+            </table>
+          </article>
+        </div>
+      }
     </section>
   `,
+  styles: [`
+    .host-detail {
+      display: grid;
+      gap: 0.75rem;
+    }
+
+    .hero {
+      display: grid;
+      gap: 0.45rem;
+      padding: 0.8rem;
+      border: 1px solid var(--color-border-primary);
+      border-radius: var(--radius-md);
+      background: var(--color-surface-primary);
+    }
+
+    .hero__nav {
+      display: flex;
+      justify-content: flex-start;
+    }
+
+    .back-link {
+      color: var(--color-text-link);
+      text-decoration: none;
+      font-size: 0.74rem;
+      font-weight: 500;
+    }
+
+    .back-link:hover {
+      text-decoration: underline;
+    }
+
+    .hero__main {
+      display: flex;
+      justify-content: space-between;
+      gap: 0.75rem;
+      align-items: flex-start;
+      flex-wrap: wrap;
+    }
+
+    .hero__title-row {
+      display: flex;
+      flex-wrap: wrap;
+      align-items: center;
+      gap: 0.4rem;
+    }
+
+    .hero__title-row h1 {
+      margin: 0;
+      font-size: 1.2rem;
+      color: var(--color-text-heading);
+    }
+
+    .hero__subtitle {
+      margin: 0.15rem 0 0;
+      color: var(--color-text-secondary);
+      font-size: 0.78rem;
+    }
+
+    .hero__chips {
+      display: flex;
+      flex-wrap: wrap;
+      gap: 0.35rem;
+    }
+
+    .chip {
+      border: 1px solid var(--color-border-primary);
+      border-radius: var(--radius-full);
+      background: var(--color-surface-secondary);
+      color: var(--color-text-secondary);
+      font-size: 0.68rem;
+      padding: 0.12rem 0.45rem;
+      white-space: nowrap;
+    }
+
+    .banner {
+      border: 1px solid var(--color-border-primary);
+      border-radius: var(--radius-md);
+      padding: 0.55rem 0.7rem;
+      font-size: 0.78rem;
+    }
+
+    .banner--error {
+      color: var(--color-status-error-text);
+      background: var(--color-status-error-bg);
+      border-color: var(--color-status-error-border);
+    }
+
+    .loading,
+    .empty-state {
+      border: 1px solid var(--color-border-primary);
+      border-radius: var(--radius-md);
+      background: var(--color-surface-primary);
+      padding: 1rem;
+      color: var(--color-text-secondary);
+      font-size: 0.8rem;
+    }
+
+    .layout {
+      display: grid;
+      gap: 0.75rem;
+      grid-template-columns: repeat(2, minmax(0, 1fr));
+    }
+
+    .card {
+      border: 1px solid var(--color-border-primary);
+      border-radius: var(--radius-md);
+      background: var(--color-surface-primary);
+      padding: 0.75rem;
+      display: grid;
+      gap: 0.55rem;
+      align-content: start;
+    }
+
+    .card--wide {
+      grid-column: 1 / -1;
+    }
+
+    .card__header {
+      display: flex;
+      justify-content: space-between;
+      align-items: flex-start;
+      gap: 0.5rem;
+    }
+
+    .card h2 {
+      margin: 0;
+      font-size: 0.92rem;
+      color: var(--color-card-heading);
+      font-weight: 600;
+    }
+
+    .card__header p {
+      margin: 0.15rem 0 0;
+      color: var(--color-text-secondary);
+      font-size: 0.74rem;
+    }
+
+    .meta-grid {
+      display: grid;
+      grid-template-columns: auto 1fr;
+      gap: 0.25rem 0.7rem;
+    }
+
+    .meta-grid__label {
+      color: var(--color-text-muted);
+      font-size: 0.68rem;
+      text-transform: uppercase;
+      letter-spacing: 0.04em;
+      font-weight: 600;
+      padding-top: 0.1rem;
+    }
+
+    .meta-grid__value {
+      color: var(--color-text-secondary);
+      font-size: 0.76rem;
+      line-height: 1.45;
+    }
+
+    .summary {
+      margin: 0;
+      color: var(--color-text-secondary);
+      font-size: 0.74rem;
+      line-height: 1.5;
+    }
+
+    .actions {
+      display: flex;
+      flex-wrap: wrap;
+      gap: 0.35rem;
+    }
+
+    .actions a,
+    .link {
+      color: var(--color-text-link);
+      text-decoration: none;
+      font-size: 0.73rem;
+      font-weight: 500;
+    }
+
+    .actions a:hover,
+    .link:hover {
+      text-decoration: underline;
+    }
+
+    .probe-empty {
+      display: grid;
+      gap: 0.65rem;
+    }
+
+    .probe-empty p {
+      margin: 0;
+      color: var(--color-text-secondary);
+      font-size: 0.76rem;
+    }
+
+    .toggle {
+      display: flex;
+      gap: 0.45rem;
+      align-items: center;
+      color: var(--color-text-primary);
+      font-size: 0.74rem;
+    }
+
+    .command-block {
+      display: grid;
+      grid-template-columns: 1fr auto;
+      gap: 0.45rem;
+      align-items: start;
+      border: 1px solid var(--color-border-primary);
+      border-radius: var(--radius-sm);
+      background: var(--color-surface-secondary);
+      padding: 0.55rem;
+    }
+
+    .command-block code,
+    .mono {
+      font-family: var(--font-mono, monospace);
+      font-size: 0.72rem;
+      word-break: break-all;
+    }
+
+    .activity-row--drift {
+      background: var(--color-status-warning-bg, rgba(245, 158, 11, 0.1));
+    }
+
+    .muted {
+      color: var(--color-text-muted);
+      font-size: 0.74rem;
+    }
+
+    table {
+      width: 100%;
+    }
+
+    @media (max-width: 1080px) {
+      .layout {
+        grid-template-columns: 1fr;
+      }
+
+      .card--wide {
+        grid-column: auto;
+      }
+    }
+  `],
+  changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class TopologyHostDetailPageComponent {
+  private readonly topologyApi = inject(TopologyDataService);
   private readonly route = inject(ActivatedRoute);
-  readonly hostId = this.route.snapshot.paramMap.get('hostId') ?? 'unknown';
+
+  readonly context = inject(PlatformContextStore);
+
+  readonly hostId = signal('');
+  readonly loading = signal(true);
+  readonly error = signal<string | null>(null);
+  readonly enableRuntimeVerification = signal(true);
+
+  readonly hosts = signal<TopologyHost[]>([]);
+  readonly targets = signal<TopologyTarget[]>([]);
+
+  readonly host = computed(() => this.hosts().find((item) => item.hostId === this.hostId()) ?? null);
+
+  readonly hostTargets = computed(() => {
+    const host = this.host();
+    if (!host) {
+      return [];
+    }
+
+    return this.targets()
+      .filter((item) => item.hostId === host.hostId)
+      .sort((a, b) => a.name.localeCompare(b.name, 'en', { sensitivity: 'base' }));
+  });
+
+  readonly dominantHostRelease = computed(() => dominantReleaseVersion(this.hostTargets()));
+
+  readonly recentActivity = computed<HostActivityRow[]>(() => {
+    const expectedRelease = this.dominantHostRelease();
+
+    return this.hostTargets()
+      .map((target) => ({
+        targetId: target.targetId,
+        targetName: target.name,
+        lastSyncAt: target.lastSyncAt,
+        releaseVersionId: target.releaseVersionId || null,
+        imageDigest: target.imageDigest || null,
+        drifted:
+          !!expectedRelease &&
+          !!target.releaseVersionId &&
+          target.releaseVersionId.trim().length > 0 &&
+          target.releaseVersionId !== expectedRelease,
+      }))
+      .sort((a, b) => {
+        const aTime = a.lastSyncAt ? Date.parse(a.lastSyncAt) : 0;
+        const bTime = b.lastSyncAt ? Date.parse(b.lastSyncAt) : 0;
+        return bTime - aTime;
+      })
+      .slice(0, 5);
+  });
+
+  readonly connectionProfile = computed<HostConnectionProfile>(() => {
+    const host = this.host();
+    if (!host) {
+      return inferConnectionProfile('-', 'docker_host');
+    }
+
+    return inferConnectionProfile(host.hostName, host.runtimeType);
+  });
+
+  readonly hasProbe = computed(() => hasRuntimeProbe(this.host()));
+
+  readonly probeTone = computed(() => {
+    const host = this.host();
+    return probeStatusTone(normalizeProbeStatus(host?.probeStatus));
+  });
+
+  readonly probeLabel = computed(() => {
+    const host = this.host();
+    return probeStatusLabel(normalizeProbeStatus(host?.probeStatus));
+  });
+
+  readonly probeType = computed(() => {
+    const host = this.host();
+    const fallbackProbe = inferProbeRecommendation(host?.runtimeType ?? this.connectionProfile().connectionLabel);
+    return probeTypeLabel(host?.probeType ?? fallbackProbe);
+  });
+
+  readonly probePanelSummary = computed(() => {
+    if (!this.hasProbe()) {
+      return 'Install guidance is shown because no probe heartbeat is currently attached to this host.';
+    }
+
+    return `${this.probeType()} probe state is ${this.probeLabel().toLowerCase()}.`;
+  });
+
+  readonly installCommand = computed(() => {
+    const host = this.host();
+    const hostToken = host?.hostName ?? '<hostname>';
+    const includeVerificationFlag = this.enableRuntimeVerification();
+
+    if (this.connectionProfile().shell === 'powershell') {
+      const verificationSegment = includeVerificationFlag ? "$env:STELLA_RUNTIME_VERIFICATION='1'; " : '';
+      return `$env:STELLA_HOST='${hostToken}'; $env:STELLA_TOKEN='<token>'; ${verificationSegment}Invoke-WebRequest -UseBasicParsing https://stella-ops.local/api/v1/agents/install.ps1 | Invoke-Expression`;
+    }
+
+    const verificationSegment = includeVerificationFlag ? ' STELLA_RUNTIME_VERIFICATION=1' : '';
+    return `curl -sSL https://stella-ops.local/api/v1/agents/install.sh | STELLA_HOST=${hostToken} STELLA_TOKEN=<token>${verificationSegment} bash`;
+  });
+
+  constructor() {
+    this.context.initialize();
+
+    this.route.paramMap.subscribe((params) => {
+      const hostId = params.get('hostId') ?? '';
+      this.hostId.set(hostId);
+      if (hostId) {
+        this.load();
+      }
+    });
+  }
+
+  shortId(value: string | null | undefined): string {
+    return shortId(value);
+  }
+
+  shortDigest(value: string | null | undefined): string {
+    return shortDigest(value);
+  }
+
+  hostStatusTone(status: string): 'success' | 'warning' | 'error' | 'neutral' {
+    const normalized = status.trim().toLowerCase();
+    if (normalized === 'healthy') {
+      return 'success';
+    }
+    if (normalized === 'degraded') {
+      return 'warning';
+    }
+    if (normalized === 'offline' || normalized === 'unhealthy') {
+      return 'error';
+    }
+    return 'neutral';
+  }
+
+  lastSeenLabel(): string {
+    const currentHost = this.host();
+    if (!currentHost?.lastSeenAt) {
+      return 'No host heartbeat yet';
+    }
+
+    return new RelativeTimePipe().transform(currentHost.lastSeenAt) || currentHost.lastSeenAt;
+  }
+
+  probeLastHeartbeatLabel(): string {
+    const currentHost = this.host();
+    const value = currentHost?.probeLastHeartbeat ?? currentHost?.lastSeenAt;
+    if (!value) {
+      return 'No probe heartbeat yet';
+    }
+
+    return new RelativeTimePipe().transform(value) || value;
+  }
+
+  private load(): void {
+    this.loading.set(true);
+    this.error.set(null);
+
+    forkJoin({
+      hosts: this.topologyApi.list<TopologyHost>('/api/v2/topology/hosts', this.context).pipe(catchError(() => of([]))),
+      targets: this.topologyApi.list<TopologyTarget>('/api/v2/topology/targets', this.context).pipe(catchError(() => of([]))),
+    })
+      .pipe(take(1))
+      .subscribe({
+        next: ({ hosts, targets }) => {
+          this.hosts.set(hosts);
+          this.targets.set(targets);
+
+          if (!hosts.some((item) => item.hostId === this.hostId())) {
+            this.error.set(`Host ${this.hostId()} was not found in the current topology scope.`);
+          }
+
+          this.loading.set(false);
+        },
+        error: (err: unknown) => {
+          this.error.set(err instanceof Error ? err.message : 'Failed to load host detail.');
+          this.loading.set(false);
+        },
+      });
+  }
 }
-
-

src/Web/StellaOps.Web/src/app/features/topology/topology-hosts-page.component.ts

@@ -1,22 +1,36 @@
-import { ChangeDetectionStrategy, Component, computed, effect, inject, signal } from '@angular/core';
+import { ChangeDetectionStrategy, Component, computed, DestroyRef, effect, inject, signal } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import { ActivatedRoute, RouterLink } from '@angular/router';
 import { catchError, forkJoin, of, take } from 'rxjs';
 
 import { PlatformContextStore } from '../../core/context/platform-context.store';
+import { StellaHelperContextService } from '../../shared/components/stella-helper/stella-helper-context.service';
+import { RelativeTimePipe } from '../../shared/pipes/format.pipes';
+import { StatusBadgeComponent } from '../../shared/ui/status-badge/status-badge.component';
 import { TopologyDataService } from './topology-data.service';
 import { TopologyHost, TopologyTarget } from './topology.models';
+import {
+  hasRuntimeProbe,
+  inferConnectionProfile,
+  normalizeProbeStatus,
+  probeStatusLabel,
+  probeStatusTone,
+  probeTypeLabel,
+} from './topology-runtime.helpers';
+
+type HostStatusFilter = 'all' | 'healthy' | 'degraded' | 'offline' | 'unknown';
+type ProbeFilter = 'all' | 'monitored' | 'unmonitored';
 
 @Component({
   selector: 'app-topology-hosts-page',
   standalone: true,
-  imports: [FormsModule, RouterLink],
+  imports: [FormsModule, RouterLink, StatusBadgeComponent],
   template: `
     <section class="hosts">
       <header class="hosts__header">
         <div>
           <h1>Hosts</h1>
-          <p>Operational host inventory with runtime, heartbeat, and target mapping.</p>
+          <p>Operational host inventory with runtime probe coverage, heartbeat freshness, and target mapping.</p>
         </div>
         <div class="hosts__scope">
           <span>{{ context.regionSummary() }}</span>
@@ -39,7 +53,7 @@ import { TopologyHost, TopologyTarget } from './topology.models';
           </select>
         </div>
         <div class="filters__item">
-          <label for="hosts-status">Status</label>
+          <label for="hosts-status">Host Status</label>
           <select id="hosts-status" [ngModel]="statusFilter()" (ngModelChange)="statusFilter.set($event)">
             <option value="all">All</option>
             <option value="healthy">Healthy</option>
@@ -48,6 +62,14 @@ import { TopologyHost, TopologyTarget } from './topology.models';
             <option value="unknown">Unknown</option>
           </select>
         </div>
+        <div class="filters__item">
+          <label for="hosts-probe">Runtime Probe</label>
+          <select id="hosts-probe" [ngModel]="probeFilter()" (ngModelChange)="probeFilter.set($event)">
+            <option value="all">All</option>
+            <option value="monitored">Monitored</option>
+            <option value="unmonitored">Not monitored</option>
+          </select>
+        </div>
       </section>
 
       @if (error()) {
@@ -56,15 +78,31 @@ import { TopologyHost, TopologyTarget } from './topology.models';
 
       @if (loading()) {
         <div class="skeleton-table">
-          <div class="skeleton-row" style="width:100%"><div class="skeleton-line skeleton-line--title"></div></div>
-          <div class="skeleton-row"><div class="skeleton-line"></div><div class="skeleton-line skeleton-line--short"></div></div>
-          <div class="skeleton-row"><div class="skeleton-line"></div><div class="skeleton-line skeleton-line--short"></div></div>
-          <div class="skeleton-row"><div class="skeleton-line"></div><div class="skeleton-line skeleton-line--short"></div></div>
+          <div class="skeleton-row" style="width: 100%">
+            <div class="skeleton-line skeleton-line--title"></div>
+          </div>
+          <div class="skeleton-row">
+            <div class="skeleton-line"></div>
+            <div class="skeleton-line skeleton-line--short"></div>
+          </div>
+          <div class="skeleton-row">
+            <div class="skeleton-line"></div>
+            <div class="skeleton-line skeleton-line--short"></div>
+          </div>
+          <div class="skeleton-row">
+            <div class="skeleton-line"></div>
+            <div class="skeleton-line skeleton-line--short"></div>
+          </div>
         </div>
       } @else {
         <section class="split">
           <article class="card">
-            <h2>Hosts</h2>
+            <div class="card__header">
+              <div>
+                <h2>Hosts</h2>
+                <p>{{ monitoredHostsCount() }} monitored of {{ hosts().length }} in scope</p>
+              </div>
+            </div>
             <div class="table-wrap">
               <table class="stella-table stella-table--hoverable">
                 <thead>
@@ -74,24 +112,53 @@ import { TopologyHost, TopologyTarget } from './topology.models';
                     <th>Environment</th>
                     <th>Runtime</th>
                     <th>Status</th>
+                    <th>Runtime Probe</th>
+                    <th>Last Seen</th>
                     <th>Targets</th>
                   </tr>
                 </thead>
                 <tbody>
                   @for (host of filteredHosts(); track host.hostId) {
                     <tr [class.active]="selectedHostId() === host.hostId" (click)="selectedHostId.set(host.hostId)">
-                      <td class="cell-name">{{ host.hostName }}</td>
+                      <td class="cell-host">
+                        <div class="cell-host__main">
+                          <a [routerLink]="hostDetailLink(host.hostId)" class="cell-host__link">{{ host.hostName }}</a>
+                          <span class="cell-host__meta">{{ host.hostId }}</span>
+                        </div>
+                      </td>
                       <td>{{ host.regionId }}</td>
                       <td>{{ host.environmentId }}</td>
                       <td>{{ host.runtimeType }}</td>
-                      <td><span class="status-badge" [class.status-badge--healthy]="host.status.toLowerCase() === 'healthy'" [class.status-badge--degraded]="host.status.toLowerCase() === 'degraded'" [class.status-badge--unhealthy]="host.status.toLowerCase() === 'offline'" [class.status-badge--muted]="host.status.toLowerCase() === 'unknown'">{{ host.status }}</span></td>
+                      <td>
+                        <app-status-badge
+                          [status]="hostStatusTone(host.status)"
+                          [label]="host.status"
+                          [showIcon]="true"
+                          size="sm"
+                        />
+                      </td>
+                      <td>
+                        <div class="probe-cell" [title]="probeTooltip(host)">
+                          <app-status-badge
+                            [status]="probeTone(host)"
+                            [label]="probeLabel(host)"
+                            [showIcon]="true"
+                            size="sm"
+                          />
+                          @if (showProbeType(host)) {
+                            <span class="probe-cell__type">{{ probeType(host) }}</span>
+                          }
+                        </div>
+                      </td>
+                      <td>{{ lastSeenLabel(host) }}</td>
                       <td>{{ host.targetCount }}</td>
                     </tr>
                   } @empty {
-                    <tr><td colspan="6" class="empty-cell">
-                      <svg class="empty-cell__icon" viewBox="0 0 20 20" fill="currentColor" width="16" height="16"><path fill-rule="evenodd" d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7 4a1 1 0 11-2 0 1 1 0 012 0zm-1-9a1 1 0 00-1 1v4a1 1 0 102 0V6a1 1 0 00-1-1z" clip-rule="evenodd"/></svg>
-                      No hosts for current filters.
-                    </td></tr>
+                    <tr>
+                      <td colspan="8" class="empty-cell">
+                        No hosts for current filters.
+                      </td>
+                    </tr>
                   }
                 </tbody>
               </table>
@@ -101,24 +168,52 @@ import { TopologyHost, TopologyTarget } from './topology.models';
           <article class="card detail">
             <h2>Selected Host</h2>
             @if (selectedHost()) {
-              <p class="detail__name"><strong>{{ selectedHost()!.hostName }}</strong></p>
-              <div class="detail__grid">
-                <span class="detail__label">Status</span><span class="detail__value"><span class="status-badge" [class.status-badge--healthy]="selectedHost()!.status.toLowerCase() === 'healthy'" [class.status-badge--degraded]="selectedHost()!.status.toLowerCase() === 'degraded'" [class.status-badge--unhealthy]="selectedHost()!.status.toLowerCase() === 'offline'" [class.status-badge--muted]="selectedHost()!.status.toLowerCase() === 'unknown'">{{ selectedHost()!.status }}</span></span>
-                <span class="detail__label">Runtime</span><span class="detail__value">{{ selectedHost()!.runtimeType }}</span>
-                <span class="detail__label">Agent</span><span class="detail__value">{{ selectedHost()!.agentId }}</span>
-                <span class="detail__label">Last seen</span><span class="detail__value">{{ selectedHost()!.lastSeenAt ?? '-' }}</span>
-                <span class="detail__label">Impacted targets</span><span class="detail__value">{{ selectedHostTargets().length }}</span>
-                <span class="detail__label">Upgrade window</span><span class="detail__value">Fri 23:00 UTC</span>
+              <div class="detail__hero">
+                <div>
+                  <p class="detail__name">{{ selectedHost()!.hostName }}</p>
+                  <p class="detail__meta">{{ selectedHost()!.regionId }} / {{ selectedHost()!.environmentId }}</p>
+                </div>
+                <app-status-badge
+                  [status]="probeTone(selectedHost()!)"
+                  [label]="probeLabel(selectedHost()!)"
+                  [showIcon]="true"
+                  size="sm"
+                />
               </div>
+
+              <div class="detail__grid">
+                <span class="detail__label">Runtime</span>
+                <span class="detail__value">{{ selectedHost()!.runtimeType }}</span>
+
+                <span class="detail__label">Host status</span>
+                <span class="detail__value">{{ selectedHost()!.status }}</span>
+
+                <span class="detail__label">Connection</span>
+                <span class="detail__value">{{ selectedConnectionProfile().connectionLabel }}</span>
+
+                <span class="detail__label">Endpoint</span>
+                <span class="detail__value">{{ selectedConnectionProfile().endpointLabel }}:{{ selectedConnectionProfile().portLabel }}</span>
+
+                <span class="detail__label">Probe</span>
+                <span class="detail__value">{{ probeType(selectedHost()!) }}</span>
+
+                <span class="detail__label">Last seen</span>
+                <span class="detail__value">{{ lastSeenLabel(selectedHost()!) }}</span>
+
+                <span class="detail__label">Mapped targets</span>
+                <span class="detail__value">{{ selectedHostTargets().length }}</span>
+              </div>
+
+              <p class="detail__summary">{{ selectedConnectionProfile().summary }}</p>
+
               <div class="actions">
-                <a [routerLink]="['/setup/topology/targets']" [queryParams]="{ hostId: selectedHost()!.hostId }" queryParamsHandling="merge">Open Targets</a>
-                <a [routerLink]="['/setup/topology/agents']" [queryParams]="{ agentId: selectedHost()!.agentId }" queryParamsHandling="merge">Open Agent</a>
-                <a [routerLink]="['/ops/integrations']" queryParamsHandling="merge">Integrations</a>
+                <a [routerLink]="hostDetailLink(selectedHost()!.hostId)">Open Host Detail</a>
+                <a [routerLink]="['/environments/targets']" [queryParams]="{ hostId: selectedHost()!.hostId }">Open Targets</a>
+                <a [routerLink]="['/ops/operations/agents']" [queryParams]="{ agentId: selectedHost()!.agentId }">Open Agent</a>
               </div>
             } @else {
               <div class="empty-state">
-                <svg class="empty-state__icon" viewBox="0 0 20 20" fill="currentColor" width="20" height="20"><path fill-rule="evenodd" d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7-4a1 1 0 11-2 0 1 1 0 012 0zM9 9a1 1 0 000 2v3a1 1 0 001 1h1a1 1 0 100-2v-3a1 1 0 00-1-1H9z" clip-rule="evenodd"/></svg>
-                <span>Select a host row to inspect runtime drift and impact.</span>
+                <span>Select a host row to inspect runtime coverage and mapped targets.</span>
               </div>
             }
           </article>
@@ -168,7 +263,6 @@ import { TopologyHost, TopologyTarget } from './topology.models';
       padding: 0.1rem 0.45rem;
     }
 
-    /* --- Filters --- */
     .filters {
       border: 1px solid var(--color-border-primary);
       border-radius: var(--radius-md);
@@ -180,8 +274,15 @@ import { TopologyHost, TopologyTarget } from './topology.models';
       flex-wrap: wrap;
     }
 
-    .filters__item { display: grid; gap: 0.15rem; }
-    .filters__item--wide { flex: 1; min-width: 180px; }
+    .filters__item {
+      display: grid;
+      gap: 0.15rem;
+    }
+
+    .filters__item--wide {
+      flex: 1;
+      min-width: 180px;
+    }
 
     .filters label {
       font-size: 0.67rem;
@@ -209,7 +310,6 @@ import { TopologyHost, TopologyTarget } from './topology.models';
       box-shadow: 0 0 0 2px var(--color-focus-ring);
     }
 
-    /* --- Banner --- */
     .banner {
       border: 1px solid var(--color-border-primary);
       border-radius: var(--radius-md);
@@ -225,7 +325,6 @@ import { TopologyHost, TopologyTarget } from './topology.models';
       border-color: var(--color-status-error-border);
     }
 
-    /* --- Skeleton --- */
     .skeleton-table {
       border: 1px solid var(--color-border-primary);
       border-radius: var(--radius-md);
@@ -235,30 +334,43 @@ import { TopologyHost, TopologyTarget } from './topology.models';
       gap: 0.5rem;
     }
 
-    .skeleton-row { display: flex; gap: 0.75rem; }
+    .skeleton-row {
+      display: flex;
+      gap: 0.75rem;
+    }
 
     .skeleton-line {
       flex: 1;
       height: 0.65rem;
       border-radius: var(--radius-sm);
-      background: linear-gradient(90deg, var(--color-skeleton-base) 25%, var(--color-skeleton-highlight) 50%, var(--color-skeleton-base) 75%);
+      background: linear-gradient(
+        90deg,
+        var(--color-skeleton-base) 25%,
+        var(--color-skeleton-highlight) 50%,
+        var(--color-skeleton-base) 75%
+      );
       background-size: 200% 100%;
       animation: shimmer 1.5s ease-in-out infinite;
     }
 
-    .skeleton-line--title { height: 0.85rem; max-width: 30%; }
-    .skeleton-line--short { max-width: 40%; }
+    .skeleton-line--title {
+      height: 0.85rem;
+      max-width: 30%;
+    }
+
+    .skeleton-line--short {
+      max-width: 40%;
+    }
 
     @keyframes shimmer {
       0% { background-position: 200% 0; }
       100% { background-position: -200% 0; }
     }
 
-    /* --- Layout --- */
     .split {
       display: grid;
       gap: 0.6rem;
-      grid-template-columns: 1.45fr 1fr;
+      grid-template-columns: 1.55fr 1fr;
       align-items: start;
     }
 
@@ -268,12 +380,9 @@ import { TopologyHost, TopologyTarget } from './topology.models';
       background: var(--color-surface-primary);
       padding: 0.7rem;
       display: grid;
-      gap: 0.4rem;
-      transition: box-shadow 180ms ease;
+      gap: 0.5rem;
     }
 
-    .card:hover { box-shadow: var(--shadow-sm); }
-
     .card h2 {
       margin: 0;
       font-size: 0.92rem;
@@ -281,18 +390,30 @@ import { TopologyHost, TopologyTarget } from './topology.models';
       font-weight: 600;
     }
 
-    /* --- Table --- */
+    .card__header {
+      display: flex;
+      justify-content: space-between;
+      align-items: flex-start;
+      gap: 0.5rem;
+    }
+
+    .card__header p {
+      margin: 0.15rem 0 0;
+      color: var(--color-text-secondary);
+      font-size: 0.74rem;
+    }
+
     .table-wrap {
-      max-height: 420px;
+      max-height: 520px;
       overflow: auto;
       border-radius: var(--radius-sm);
     }
 
-    /* Table styling provided by global .stella-table class */
     th {
       position: sticky;
       top: 0;
       z-index: 1;
+      white-space: nowrap;
     }
 
     tbody tr {
@@ -300,41 +421,77 @@ import { TopologyHost, TopologyTarget } from './topology.models';
       transition: background 120ms ease;
     }
 
-    tbody tr:nth-child(even) { background: var(--color-surface-primary); }
-    tbody tr:hover { background: var(--color-brand-soft); }
+    tbody tr:hover {
+      background: var(--color-brand-soft);
+    }
 
     tbody tr.active {
       background: var(--color-brand-primary-10);
       box-shadow: inset 3px 0 0 var(--color-brand-primary);
     }
 
-    .cell-name { font-weight: 500; }
+    .cell-host__main {
+      display: grid;
+      gap: 0.12rem;
+    }
 
-    /* --- Status badges --- */
-    .status-badge {
+    .cell-host__link {
+      color: var(--color-text-link);
+      text-decoration: none;
+      font-weight: 600;
+    }
+
+    .cell-host__link:hover {
+      text-decoration: underline;
+    }
+
+    .cell-host__meta {
+      color: var(--color-text-muted);
+      font-size: 0.68rem;
+      font-family: var(--font-mono, monospace);
+    }
+
+    .probe-cell {
       display: inline-flex;
       align-items: center;
-      border-radius: var(--radius-full);
-      font-size: 0.67rem;
-      font-weight: 500;
-      padding: 0.1rem 0.4rem;
-      line-height: 1.3;
-      border: 1px solid transparent;
+      gap: 0.35rem;
       white-space: nowrap;
     }
 
-    .status-badge--healthy { background: var(--color-status-success-bg); color: var(--color-status-success-text); border-color: var(--color-status-success-border); }
-    .status-badge--degraded { background: var(--color-status-warning-bg); color: var(--color-status-warning-text); border-color: var(--color-status-warning-border); }
-    .status-badge--unhealthy { background: var(--color-status-error-bg); color: var(--color-status-error-text); border-color: var(--color-status-error-border); }
-    .status-badge--muted { background: var(--color-surface-tertiary); color: var(--color-text-muted); border-color: var(--color-border-primary); }
+    .probe-cell__type {
+      color: var(--color-text-muted);
+      font-size: 0.68rem;
+      font-weight: 500;
+    }
 
-    /* --- Detail panel --- */
-    .detail__name { margin: 0; font-size: 0.82rem; color: var(--color-text-primary); }
+    .detail {
+      align-content: start;
+    }
+
+    .detail__hero {
+      display: flex;
+      justify-content: space-between;
+      align-items: flex-start;
+      gap: 0.5rem;
+    }
+
+    .detail__name {
+      margin: 0;
+      font-size: 0.9rem;
+      font-weight: 700;
+      color: var(--color-text-primary);
+    }
+
+    .detail__meta {
+      margin: 0.12rem 0 0;
+      color: var(--color-text-secondary);
+      font-size: 0.74rem;
+    }
 
     .detail__grid {
       display: grid;
       grid-template-columns: auto 1fr;
-      gap: 0.2rem 0.6rem;
+      gap: 0.25rem 0.6rem;
       font-size: 0.74rem;
     }
 
@@ -347,12 +504,22 @@ import { TopologyHost, TopologyTarget } from './topology.models';
       padding-top: 0.1rem;
     }
 
-    .detail__value { color: var(--color-text-secondary); }
+    .detail__value {
+      color: var(--color-text-secondary);
+    }
 
-    .detail p { margin: 0; color: var(--color-text-secondary); font-size: 0.75rem; }
+    .detail__summary {
+      margin: 0;
+      color: var(--color-text-secondary);
+      font-size: 0.74rem;
+      line-height: 1.45;
+    }
 
-    /* --- Actions --- */
-    .actions { display: flex; flex-wrap: wrap; gap: 0.35rem; }
+    .actions {
+      display: flex;
+      flex-wrap: wrap;
+      gap: 0.35rem;
+    }
 
     .actions a {
       display: inline-flex;
@@ -372,39 +539,28 @@ import { TopologyHost, TopologyTarget } from './topology.models';
       color: var(--color-text-link-hover);
     }
 
-    /* --- Empty states --- */
-    .empty-cell {
+    .empty-cell,
+    .empty-state {
       text-align: center;
       color: var(--color-text-muted);
       font-size: 0.74rem;
       padding: 1rem 0.5rem;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      gap: 0.35rem;
     }
 
-    .empty-cell__icon { opacity: 0.4; flex-shrink: 0; }
-
-    .empty-state {
-      display: flex;
-      flex-direction: column;
-      align-items: center;
-      gap: 0.35rem;
-      padding: 1rem;
-      color: var(--color-text-muted);
-      font-size: 0.76rem;
-      text-align: center;
+    @media (max-width: 1080px) {
+      .split {
+        grid-template-columns: 1fr;
+      }
     }
 
-    .empty-state__icon { opacity: 0.35; }
-
-    .muted { color: var(--color-text-secondary); font-size: 0.74rem; }
-
     @media (max-width: 960px) {
-      .filters { flex-direction: column; }
-      .filters__item--wide { min-width: auto; }
-      .split { grid-template-columns: 1fr; }
+      .filters {
+        flex-direction: column;
+      }
+
+      .filters__item--wide {
+        min-width: auto;
+      }
     }
   `],
   changeDetection: ChangeDetectionStrategy.OnPush,
@@ -412,45 +568,68 @@ import { TopologyHost, TopologyTarget } from './topology.models';
 export class TopologyHostsPageComponent {
   private readonly topologyApi = inject(TopologyDataService);
   private readonly route = inject(ActivatedRoute);
+  private readonly destroyRef = inject(DestroyRef);
+  private readonly helperCtx = inject(StellaHelperContextService);
+
   readonly context = inject(PlatformContextStore);
 
   readonly loading = signal(false);
   readonly error = signal<string | null>(null);
   readonly searchQuery = signal('');
   readonly runtimeFilter = signal('all');
-  readonly statusFilter = signal('all');
+  readonly statusFilter = signal<HostStatusFilter>('all');
+  readonly probeFilter = signal<ProbeFilter>('all');
   readonly selectedHostId = signal('');
 
   readonly hosts = signal<TopologyHost[]>([]);
   readonly targets = signal<TopologyTarget[]>([]);
 
   readonly runtimeOptions = computed(() =>
-    [...new Set(this.hosts().map((item) => item.runtimeType))].sort((a, b) => a.localeCompare(b, 'en', { sensitivity: 'base' })),
+    [...new Set(this.hosts().map((item) => item.runtimeType))]
+      .filter((value) => value.trim().length > 0)
+      .sort((a, b) => a.localeCompare(b, 'en', { sensitivity: 'base' })),
   );
 
   readonly filteredHosts = computed(() => {
     const query = this.searchQuery().trim().toLowerCase();
     const runtime = this.runtimeFilter();
     const status = this.statusFilter();
+    const probe = this.probeFilter();
 
     return this.hosts().filter((item) => {
       const matchesQuery =
         !query ||
-        [item.hostName, item.hostId, item.regionId, item.environmentId, item.runtimeType]
-          .some((value) => value.toLowerCase().includes(query));
+        [
+          item.hostName,
+          item.hostId,
+          item.regionId,
+          item.environmentId,
+          item.runtimeType,
+          item.agentId,
+          probeStatusLabel(normalizeProbeStatus(item.probeStatus)),
+        ].some((value) => value.toLowerCase().includes(query));
       const matchesRuntime = runtime === 'all' || item.runtimeType === runtime;
       const normalizedStatus = item.status.trim().toLowerCase();
       const matchesStatus = status === 'all' || normalizedStatus === status;
-      return matchesQuery && matchesRuntime && matchesStatus;
+      const monitored = hasRuntimeProbe(item);
+      const matchesProbe =
+        probe === 'all' ||
+        (probe === 'monitored' && monitored) ||
+        (probe === 'unmonitored' && !monitored);
+
+      return matchesQuery && matchesRuntime && matchesStatus && matchesProbe;
     });
   });
 
   readonly selectedHost = computed(() => {
     const selectedId = this.selectedHostId();
+    const filteredHosts = this.filteredHosts();
+
     if (!selectedId) {
-      return this.filteredHosts()[0] ?? null;
+      return filteredHosts[0] ?? null;
     }
-    return this.hosts().find((item) => item.hostId === selectedId) ?? null;
+
+    return filteredHosts.find((item) => item.hostId === selectedId) ?? filteredHosts[0] ?? null;
   });
 
   readonly selectedHostTargets = computed(() => {
@@ -458,7 +637,34 @@ export class TopologyHostsPageComponent {
     if (!host) {
       return [];
     }
-    return this.targets().filter((item) => item.hostId === host.hostId);
+
+    return this.targets()
+      .filter((item) => item.hostId === host.hostId)
+      .sort((a, b) => a.name.localeCompare(b.name, 'en', { sensitivity: 'base' }));
+  });
+
+  readonly selectedConnectionProfile = computed(() => {
+    const host = this.selectedHost();
+    if (!host) {
+      return inferConnectionProfile('-', 'docker_host');
+    }
+
+    return inferConnectionProfile(host.hostName, host.runtimeType);
+  });
+
+  readonly monitoredHostsCount = computed(() => this.hosts().filter((host) => hasRuntimeProbe(host)).length);
+  readonly helperContexts = computed(() => {
+    const contexts: string[] = [];
+    if (!this.loading() && this.filteredHosts().length === 0) {
+      contexts.push('empty-table');
+    }
+    if (
+      this.hosts().some((host) => host.status.trim().toLowerCase() === 'unknown') ||
+      (!this.loading() && this.hosts().length > 0 && this.monitoredHostsCount() === 0)
+    ) {
+      contexts.push('health-unknown');
+    }
+    return contexts;
   });
 
   constructor() {
@@ -469,6 +675,7 @@ export class TopologyHostsPageComponent {
       if (hostId) {
         this.selectedHostId.set(hostId);
       }
+
       const environment = params.get('environment');
       if (environment) {
         this.searchQuery.set(environment);
@@ -479,6 +686,71 @@ export class TopologyHostsPageComponent {
       this.context.contextVersion();
       this.load();
     });
+
+    effect(() => {
+      this.helperCtx.setScope('topology-hosts', this.helperContexts());
+    }, { allowSignalWrites: true });
+    this.destroyRef.onDestroy(() => this.helperCtx.clearScope('topology-hosts'));
+  }
+
+  hostDetailLink(hostId: string): string[] {
+    return ['/environments/hosts', hostId];
+  }
+
+  hostStatusTone(status: string): 'success' | 'warning' | 'error' | 'neutral' {
+    const normalized = status.trim().toLowerCase();
+    if (normalized === 'healthy') {
+      return 'success';
+    }
+    if (normalized === 'degraded') {
+      return 'warning';
+    }
+    if (normalized === 'offline' || normalized === 'unhealthy') {
+      return 'error';
+    }
+    return 'neutral';
+  }
+
+  probeTone(host: TopologyHost): 'success' | 'error' | 'neutral' {
+    return probeStatusTone(normalizeProbeStatus(host.probeStatus));
+  }
+
+  probeLabel(host: TopologyHost): string {
+    return probeStatusLabel(normalizeProbeStatus(host.probeStatus));
+  }
+
+  probeType(host: TopologyHost): string {
+    const normalizedStatus = normalizeProbeStatus(host.probeStatus);
+    if (normalizedStatus !== 'active') {
+      return probeTypeLabel(host.probeType ?? inferConnectionProfile(host.hostName, host.runtimeType).probeRecommendation);
+    }
+
+    return probeTypeLabel(host.probeType ?? inferConnectionProfile(host.hostName, host.runtimeType).probeRecommendation);
+  }
+
+  showProbeType(host: TopologyHost): boolean {
+    return normalizeProbeStatus(host.probeStatus) === 'active';
+  }
+
+  probeTooltip(host: TopologyHost): string {
+    const lastSeen = host.probeLastHeartbeat ?? host.lastSeenAt;
+    const status = this.probeLabel(host);
+    const type = this.probeType(host);
+
+    if (!lastSeen) {
+      return `${status}${type ? ` - ${type}` : ''}`;
+    }
+
+    return `${status}${type ? ` - ${type}` : ''}. Last heartbeat ${this.relativeTime(lastSeen)}.`;
+  }
+
+  lastSeenLabel(host: TopologyHost): string {
+    const lastSeen = host.probeLastHeartbeat ?? host.lastSeenAt;
+    return lastSeen ? this.relativeTime(lastSeen) : '-';
+  }
+
+  private relativeTime(value: string): string {
+    return new RelativeTimePipe().transform(value) || value;
   }
 
   private load(): void {
@@ -494,9 +766,11 @@ export class TopologyHostsPageComponent {
         next: ({ hosts, targets }) => {
           this.hosts.set(hosts);
           this.targets.set(targets);
+
           if (!this.selectedHostId() && hosts.length > 0) {
             this.selectedHostId.set(hosts[0].hostId);
           }
+
           this.loading.set(false);
         },
         error: (err: unknown) => {
@@ -508,5 +782,3 @@ export class TopologyHostsPageComponent {
       });
   }
 }
-
-

src/Web/StellaOps.Web/src/app/features/topology/topology-runtime.helpers.ts

@@ -0,0 +1,313 @@
+import type {
+  TopologyHost,
+  TopologyProbeStatus,
+  TopologyProbeType,
+  TopologyTarget,
+} from './topology.models';
+
+export type RuntimeVerificationStatus =
+  | 'verified'
+  | 'drift'
+  | 'offline'
+  | 'not_monitored';
+
+export interface HostConnectionProfile {
+  connectionLabel: string;
+  endpointLabel: string;
+  portLabel: string;
+  shell: 'bash' | 'powershell';
+  probeRecommendation: TopologyProbeType;
+  summary: string;
+}
+
+export interface RuntimeVerificationSummary {
+  status: RuntimeVerificationStatus;
+  label: string;
+  detail: string;
+  probeTypeLabel: string;
+  lastVerifiedAt: string | null;
+  expectedReleaseVersion: string | null;
+  observedReleaseVersion: string | null;
+}
+
+function normalizeToken(value: string | null | undefined): string {
+  return (value ?? '').trim().toLowerCase();
+}
+
+export function normalizeProbeStatus(value: string | null | undefined): TopologyProbeStatus {
+  switch (normalizeToken(value)) {
+    case 'active':
+      return 'active';
+    case 'offline':
+      return 'offline';
+    default:
+      return 'not_installed';
+  }
+}
+
+export function normalizeProbeType(value: string | null | undefined): TopologyProbeType | null {
+  switch (normalizeToken(value)) {
+    case 'ebpf':
+      return 'ebpf';
+    case 'etw':
+      return 'etw';
+    case 'dyld':
+      return 'dyld';
+    default:
+      return null;
+  }
+}
+
+export function probeStatusLabel(status: TopologyProbeStatus): string {
+  switch (status) {
+    case 'active':
+      return 'Active';
+    case 'offline':
+      return 'Offline';
+    default:
+      return 'Not installed';
+  }
+}
+
+export function probeTypeLabel(type: TopologyProbeType | null | undefined): string {
+  switch (normalizeProbeType(type)) {
+    case 'ebpf':
+      return 'eBPF';
+    case 'etw':
+      return 'ETW';
+    case 'dyld':
+      return 'dyld';
+    default:
+      return 'Probe';
+  }
+}
+
+export function probeStatusTone(
+  status: TopologyProbeStatus,
+): 'success' | 'error' | 'neutral' {
+  switch (status) {
+    case 'active':
+      return 'success';
+    case 'offline':
+      return 'error';
+    default:
+      return 'neutral';
+  }
+}
+
+export function runtimeVerificationTone(
+  status: RuntimeVerificationStatus,
+): 'success' | 'warning' | 'error' | 'neutral' {
+  switch (status) {
+    case 'verified':
+      return 'success';
+    case 'drift':
+      return 'warning';
+    case 'offline':
+      return 'error';
+    default:
+      return 'neutral';
+  }
+}
+
+export function hasRuntimeProbe(host: Pick<TopologyHost, 'probeStatus'> | null | undefined): boolean {
+  return normalizeProbeStatus(host?.probeStatus) !== 'not_installed';
+}
+
+export function shortId(value: string | null | undefined, max = 12): string {
+  if (!value) {
+    return '-';
+  }
+
+  return value.length <= max ? value : `${value.slice(0, max)}...`;
+}
+
+export function shortDigest(value: string | null | undefined, head = 18): string {
+  if (!value) {
+    return '-';
+  }
+
+  return value.length <= head ? value : `${value.slice(0, head)}...`;
+}
+
+export function inferHostOsFamily(runtimeType: string | null | undefined): 'linux' | 'windows' | 'macos' {
+  const token = normalizeToken(runtimeType);
+
+  if (token.includes('winrm') || token.includes('windows') || token.includes('etw')) {
+    return 'windows';
+  }
+
+  if (token.includes('mac') || token.includes('darwin') || token.includes('dyld')) {
+    return 'macos';
+  }
+
+  return 'linux';
+}
+
+export function inferProbeRecommendation(runtimeType: string | null | undefined): TopologyProbeType {
+  switch (inferHostOsFamily(runtimeType)) {
+    case 'windows':
+      return 'etw';
+    case 'macos':
+      return 'dyld';
+    default:
+      return 'ebpf';
+  }
+}
+
+export function inferConnectionProfile(
+  hostName: string,
+  runtimeType: string | null | undefined,
+): HostConnectionProfile {
+  const token = normalizeToken(runtimeType);
+
+  if (token.includes('winrm') || token.includes('windows')) {
+    return {
+      connectionLabel: 'WinRM',
+      endpointLabel: hostName,
+      portLabel: '5985 / 5986',
+      shell: 'powershell',
+      probeRecommendation: 'etw',
+      summary: 'Windows host connection is managed over WinRM. Exact credentials are not exposed by the topology read model.',
+    };
+  }
+
+  if (token.includes('ssh')) {
+    return {
+      connectionLabel: 'SSH',
+      endpointLabel: hostName,
+      portLabel: '22',
+      shell: 'bash',
+      probeRecommendation: 'ebpf',
+      summary: 'Linux or UNIX host connection is managed over SSH. Exact credentials are not exposed by the topology read model.',
+    };
+  }
+
+  if (token.includes('compose')) {
+    return {
+      connectionLabel: 'Docker Compose',
+      endpointLabel: hostName,
+      portLabel: '2375 or local socket',
+      shell: 'bash',
+      probeRecommendation: 'ebpf',
+      summary: 'Compose workloads run on a host-backed Docker runtime. Connection specifics are currently summarized rather than exposed directly.',
+    };
+  }
+
+  if (token.includes('nomad')) {
+    return {
+      connectionLabel: 'Nomad',
+      endpointLabel: hostName,
+      portLabel: '4646',
+      shell: 'bash',
+      probeRecommendation: 'ebpf',
+      summary: 'Runtime activity is managed through Nomad control-plane workflows, not direct host credentials in the topology read model.',
+    };
+  }
+
+  if (token.includes('ecs')) {
+    return {
+      connectionLabel: 'ECS',
+      endpointLabel: hostName,
+      portLabel: 'AWS API',
+      shell: 'bash',
+      probeRecommendation: 'ebpf',
+      summary: 'Runtime activity is managed through ECS service workflows, not direct host credentials in the topology read model.',
+    };
+  }
+
+  return {
+    connectionLabel: 'Docker Host',
+    endpointLabel: hostName,
+    portLabel: '2375 or local socket',
+    shell: 'bash',
+    probeRecommendation: inferProbeRecommendation(runtimeType),
+    summary: 'Host runtime is Docker-backed. Exact connection and secret references are not exposed by the topology read model.',
+  };
+}
+
+export function dominantReleaseVersion(
+  targets: readonly Pick<TopologyTarget, 'releaseVersionId'>[],
+): string | null {
+  const counts = new Map<string, number>();
+  for (const target of targets) {
+    const version = (target.releaseVersionId ?? '').trim();
+    if (!version) {
+      continue;
+    }
+
+    counts.set(version, (counts.get(version) ?? 0) + 1);
+  }
+
+  let bestVersion: string | null = null;
+  let bestCount = -1;
+  for (const version of [...counts.keys()].sort((a, b) => a.localeCompare(b, 'en', { sensitivity: 'base' }))) {
+    const count = counts.get(version) ?? 0;
+    if (count > bestCount) {
+      bestCount = count;
+      bestVersion = version;
+    }
+  }
+
+  return bestVersion;
+}
+
+export function buildRuntimeVerificationSummary(
+  target: Pick<TopologyTarget, 'hostId' | 'releaseVersionId'>,
+  host: Pick<TopologyHost, 'hostName' | 'runtimeType' | 'probeStatus' | 'probeType' | 'probeLastHeartbeat' | 'lastSeenAt'> | null | undefined,
+  expectedReleaseVersion: string | null,
+): RuntimeVerificationSummary {
+  const probeStatus = normalizeProbeStatus(host?.probeStatus);
+  const inferredProbeType = inferProbeRecommendation(host?.runtimeType);
+  const probeType = normalizeProbeType(host?.probeType) ?? inferredProbeType;
+  const lastVerifiedAt = host?.probeLastHeartbeat ?? host?.lastSeenAt ?? null;
+  const observedReleaseVersion = (target.releaseVersionId ?? '').trim() || null;
+  const expectedVersion = (expectedReleaseVersion ?? '').trim() || null;
+  const hostLabel = host?.hostName ?? target.hostId;
+
+  if (probeStatus === 'not_installed') {
+    return {
+      status: 'not_monitored',
+      label: 'Not monitored',
+      detail: `No runtime probe heartbeat is currently bound to ${hostLabel}.`,
+      probeTypeLabel: probeTypeLabel(probeType),
+      lastVerifiedAt,
+      expectedReleaseVersion: expectedVersion,
+      observedReleaseVersion,
+    };
+  }
+
+  if (probeStatus === 'offline') {
+    return {
+      status: 'offline',
+      label: 'Offline',
+      detail: `${probeTypeLabel(probeType)} heartbeat for ${hostLabel} is stale.`,
+      probeTypeLabel: probeTypeLabel(probeType),
+      lastVerifiedAt,
+      expectedReleaseVersion: expectedVersion,
+      observedReleaseVersion,
+    };
+  }
+
+  if (expectedVersion && observedReleaseVersion && expectedVersion !== observedReleaseVersion) {
+    return {
+      status: 'drift',
+      label: 'Drift',
+      detail: `Observed release ${shortId(observedReleaseVersion)} differs from the dominant environment release ${shortId(expectedVersion)}.`,
+      probeTypeLabel: probeTypeLabel(probeType),
+      lastVerifiedAt,
+      expectedReleaseVersion: expectedVersion,
+      observedReleaseVersion,
+    };
+  }
+
+  return {
+    status: 'verified',
+    label: 'Verified',
+    detail: `Active ${probeTypeLabel(probeType)} heartbeat is present for ${hostLabel}.`,
+    probeTypeLabel: probeTypeLabel(probeType),
+    lastVerifiedAt,
+    expectedReleaseVersion: expectedVersion,
+    observedReleaseVersion,
+  };
+}

src/Web/StellaOps.Web/src/app/features/topology/topology.models.ts

@@ -6,6 +6,9 @@ export interface PlatformListResponse<T> {
   offset?: number;
 }
 
+export type TopologyProbeStatus = 'active' | 'offline' | 'not_installed';
+export type TopologyProbeType = 'ebpf' | 'etw' | 'dyld';
+
 export interface TopologyRegion {
   regionId: string;
   displayName: string;
@@ -57,6 +60,9 @@ export interface TopologyHost {
   agentId: string;
   targetCount: number;
   lastSeenAt: string | null;
+  probeStatus?: TopologyProbeStatus | null;
+  probeType?: TopologyProbeType | null;
+  probeLastHeartbeat?: string | null;
 }
 
 export interface TopologyAgent {
@@ -128,4 +134,3 @@ export interface ReadinessReport {
   evaluatedAt: string;
 }
 
-