Repair release investigation workspace contracts

docs/features/checked/web/release-investigation-routes.md

@@ -15,10 +15,15 @@ Integrated disconnected release-investigation route families (timeline, deploy-d
 ## Canonical URL Contract
 - `/releases/investigation/timeline` - Investigation timeline overview
 - `/releases/investigation/timeline/:correlationId` - Correlated event drill-in
-- `/releases/investigation/deploy-diff` - Deployment diff (query params: from, to)
-- `/releases/investigation/change-trace` - Change trace viewer
+- `/releases/investigation/deploy-diff` - Deployment diff workspace; direct load shows a recovery state when no `from`/`to` digests are present
+- `/releases/investigation/change-trace` - Change trace workspace; direct load shows a recovery state until a comparison or trace id is selected
 - `/releases/investigation/change-trace/:traceId` - Specific trace detail
 
+## Direct-Load Workspace Contract
+- `/releases/investigation/deploy-diff` no longer fails with `Missing Parameters`. Direct navigation now shows `No Comparison Selected` plus recovery actions back to `/releases/deployments` and `/releases/overview`.
+- `/releases/investigation/change-trace` no longer renders an inert `No Change Trace Loaded` shell. Direct navigation now shows `No Comparison Selected` plus recovery actions to `/releases/deployments`, or back to deploy-diff when `from`/`to` digests are already present.
+- Both workspaces preserve tenant/scope query context when it exists and fall back to the canonical `demo-prod` tenant on a fresh shell load.
+
 ## Timeline Decision
 **Bounded-secondary-route** (not absorb-into-run-workspace). The investigation timeline is a correlation-based tool that spans multiple services by correlationId, which is conceptually different from the run workspace's timeline tab showing run execution flow. Mounting it under `/releases/investigation/timeline` avoids URL collision and keeps both capabilities distinct.
 
@@ -30,6 +35,10 @@ Integrated disconnected release-investigation route families (timeline, deploy-d
   - `src/Web/StellaOps.Web/src/app/features/deploy-diff/deploy-diff.routes.ts` - Updated canonical URL reference
   - `src/Web/StellaOps.Web/src/app/features/change-trace/change-trace.routes.ts` - Added breadcrumb, title, sprint ref
 - **Tests**: `src/Web/StellaOps.Web/src/app/routes/releases.routes.spec.ts`
+- **Recheck (2026-03-09)**:
+  - `deploy-diff` is now backed by the live lineage compare contract instead of the dead `/api/v1/sbom/diff` path.
+  - `change-trace` is now backed by the restored `/api/change-traces/build` and `/api/change-traces/{traceId}` compatibility endpoints in SbomService.
+  - Focused verification passed on `src/Web/StellaOps.Web/src/app/features/deploy-diff/pages/deploy-diff.page.spec.ts` and `src/Web/StellaOps.Web/src/app/features/change-trace/change-trace-viewer.component.spec.ts`.
 
 ## Deliberately Excluded Legacy Behaviors
 - The old timeline route at `/timeline` (standalone top-level) is not revived