feat(ui): ship release promotions cutover

docs/features/checked/web/release-promotions-cutover-ui.md

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+# Release Promotions Cutover UI
+
+## Verified Scope
+- Canonical `Releases` ownership for promotions list, create, and detail routes under `/releases/promotions`.
+- Legacy `/release-control/promotions*` and `/releases/promotion-queue*` bookmarks redirect to the canonical promotions subtree with query-state preservation.
+- Active release workbench handoff into the canonical promotion wizard with `releaseId` and `returnTo`.
+- Promotion wizard release-context hydration, Decisioning Studio handoff, and successful submission into promotion detail.
+
+## Verification Commands
+- `npm run test -- --watch=false --include src/tests/releases/release-promotions-cutover.spec.ts --include src/tests/releases/release-detail.live-refresh.spec.ts`
+- `npx playwright test --config playwright.config.ts tests/e2e/release-promotions-cutover.spec.ts --workers=1`
+- `npm run build`
+
+## Verification Results
+- Angular: `2` files passed, `8` tests passed.
+- Playwright: `2` scenarios passed.
+- Build: passed.
+- Build warnings: existing bundle-budget warnings only for the initial bundle and existing setup-wizard component stylesheet budgets.
+
+## Notes
+- Browser verification initially exposed a live-shell compile error in `sidebar-preference.service.ts`; the service contract was repaired so the shell can boot and the promotions flow can be exercised in-browser.
+- Verified on UTC: `2026-03-08T09:45:51.0108656Z`