feat(ui): adopt domain signal chips on mounted surfaces [SPRINT-013]

Replace hand-rolled digest truncation/copy and reachability badges with
shared DigestChipComponent and ReachabilityStateChipComponent on releases
list, evidence-thread, attestation-links, and reachability-center.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/features/checked/web/domain-signal-chips-adoption.md

@@ -0,0 +1,49 @@
+# Domain Signal Chips Adoption (DigestChip + ReachabilityStateChip)
+
+## Module
+Web
+
+## Status
+VERIFIED
+
+## Description
+Replaced hand-rolled digest truncation/copy markup and bespoke reachability state
+display with shared domain chip components (`DigestChipComponent`,
+`ReachabilityStateChipComponent`) across mounted (routed) consumer surfaces.
+
+## Implementation Details
+
+### DigestChipComponent adoption (4 consumers)
+- `src/Web/StellaOps.Web/src/app/features/releases/releases-list-page.component.ts`
+  - Replaced `shortDigest()` + `copyDigest()` + inline SVG copy button with `<app-digest-chip variant="bundle">`
+- `src/Web/StellaOps.Web/src/app/features/evidence-thread/components/evidence-thread-view/evidence-thread-view.component.ts`
+  - Replaced `shortDigest()` computed + `copyDigest()` snackbar-based copy with `<app-digest-chip variant="artifact">`
+- `src/Web/StellaOps.Web/src/app/features/evidence-thread/components/evidence-thread-list/evidence-thread-list.component.ts`
+  - Replaced `shortDigest()` method with `<app-digest-chip variant="artifact">`
+- `src/Web/StellaOps.Web/src/app/features/lineage/components/attestation-links/attestation-links.component.ts`
+  - Replaced `truncateDigest()` + `copyDigest()` + clipboard icon with `<app-digest-chip variant="artifact">`
+
+### ReachabilityStateChipComponent adoption (1 consumer)
+- `src/Web/StellaOps.Web/src/app/features/reachability/reachability-center.component.ts`
+  - Added `<app-reachability-state-chip>` to witness rows, mapping `isReachable` boolean to `ReachabilityState` type and `confidenceScore` to confidence input
+  - Added `reachabilityState()` helper method for type mapping
+
+### Shared chip source components
+- `src/Web/StellaOps.Web/src/app/shared/domain/digest-chip/digest-chip.component.ts`
+- `src/Web/StellaOps.Web/src/app/shared/domain/reachability-state-chip/reachability-state-chip.component.ts`
+
+## Focused tests
+- `src/Web/StellaOps.Web/src/app/features/releases/releases-list-page.component.spec.ts`
+- `src/Web/StellaOps.Web/src/app/features/lineage/components/attestation-links/attestation-links.component.spec.ts`
+- `src/Web/StellaOps.Web/src/app/features/reachability/reachability-center-chip-adoption.component.spec.ts`
+- Updated: `src/Web/StellaOps.Web/src/app/features/evidence-thread/__tests__/evidence-thread-view.component.spec.ts`
+
+## Exclusions
+- `finding-list` and `finding-row` consumers reserved for sprint 020
+- Dead witness pages and disconnected route files excluded
+- Only mounted (currently routed) surfaces adopted
+
+## Verification
+- Date: 2026-03-08
+- Sprint: SPRINT_20260308_013_FE_orphan_domain_signal_chips_adoption
+- Route verification: all consumers confirmed reachable via route tree