feat: Implement Filesystem and MongoDB provenance writers for PackRun execution context

- Added `FilesystemPackRunProvenanceWriter` to write provenance manifests to the filesystem.
- Introduced `MongoPackRunArtifactReader` to read artifacts from MongoDB.
- Created `MongoPackRunProvenanceWriter` to store provenance manifests in MongoDB.
- Developed unit tests for filesystem and MongoDB provenance writers.
- Established `ITimelineEventStore` and `ITimelineIngestionService` interfaces for timeline event handling.
- Implemented `TimelineIngestionService` to validate and persist timeline events with hashing.
- Created PostgreSQL schema and migration scripts for timeline indexing.
- Added dependency injection support for timeline indexer services.
- Developed tests for timeline ingestion and schema validation.

docs/modules/telemetry/operations/dashboards/telemetry-observability.json

@@ -0,0 +1,6 @@
+{
+  "_note": "Placeholder Grafana dashboard stub for Telemetry. Replace panels when metrics endpoints are available; keep offline-import friendly.",
+  "schemaVersion": 39,
+  "title": "Telemetry Observability (stub)",
+  "panels": []
+}