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.

src/Scheduler/StellaOps.Scheduler.WebService/GraphJobs/GraphJobUpdateResult.cs

@@ -1,6 +1,6 @@
 namespace StellaOps.Scheduler.WebService.GraphJobs;
 
-internal readonly record struct GraphJobUpdateResult<TJob>(bool Updated, TJob Job) where TJob : class
+public readonly record struct GraphJobUpdateResult<TJob>(bool Updated, TJob Job) where TJob : class
 {
     public static GraphJobUpdateResult<TJob> UpdatedResult(TJob job) => new(true, job);