feat: Implement approvals workflow and notifications integration

- Added approvals orchestration with persistence and workflow scaffolding.
- Integrated notifications insights and staged resume hooks.
- Introduced approval coordinator and policy notification bridge with unit tests.
- Added approval decision API with resume requeue and persisted plan snapshots.
- Documented the Excitor consensus API beta and provided JSON sample payload.
- Created analyzers to flag usage of deprecated merge service APIs.
- Implemented logging for artifact uploads and approval decision service.
- Added tests for PackRunApprovalDecisionService and related components.

docs/updates/2025-11-05-excitor-consensus-beta.md

@@ -0,0 +1,12 @@
+# 2025-11-05 – Excitor consensus API beta
+
+**Subject:** Excitor consensus export/API preview ships  \
+**Audience:** Docs Guild, VEX Lens Guild, Policy Engine Guild, Export Center Guild
+
+- Published `docs/modules/excitor/README.md` update capturing the Link-Not-Merge consensus milestone and pointing to the beta API surface.
+- Added `docs/vex/consensus-json.md` sample describing the canonical `consensus_state` payload (`rollupStatus`, `sources[]`, `policyRevisionId`, `consensusDigest`) emitted by the preview endpoint.
+- Documented DSSE packaging plus Export Center hooks so attested consensus bundles can ride along with devportal/offline exports once Excitor workers emit DSSE manifests (`docs/modules/export-center/devportal-offline.md`).
+
+**Follow-ups**
+- [ ] Coordinate with Policy Engine (`POLICY-ENGINE-30-101`) to reference consensus policy weighting knobs before GA.
+- [ ] Produce CLI quickstart once `stella vex consensus` verbs land (CLI backlog `CLI-VEX-30-002`).