feat: Add new provenance and crypto registry documentation

- Introduced attestation inventory and subject-rekor mapping files for tracking Docker packages.
- Added a comprehensive crypto registry decision document outlining defaults and required follow-ups.
- Created an offline feeds manifest for bundling air-gap resources.
- Implemented a script to generate and update binary manifests for curated binaries.
- Added a verification script to ensure binary artefacts are located in approved directories.
- Defined new schemas for AdvisoryEvidenceBundle, OrchestratorEnvelope, ScannerReportReadyPayload, and ScannerScanCompletedPayload.
- Established project files for StellaOps.Orchestrator.Schemas and StellaOps.PolicyAuthoritySignals.Contracts.
- Updated vendor manifest to track pinned binaries for integrity.

local-nugets/manifest.json

@@ -1,5 +1,5 @@
 {
-  "generated_utc": "2025-11-18T21:32:46.618821Z",
+  "generated_utc": "2025-11-18T21:41:22.263398Z",
   "source": "StellaOps binary prereq consolidation",
   "base_dir": "local-nugets",
   "count": 91,