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.

.gitignore

@@ -14,9 +14,11 @@ obj/
 .idea/
 .vscode/
 
-# Packages and logs
-*.log
-TestResults/
+# Packages and logs
+*.log
+TestResults/
+local-nuget/
+local-nugets/packages/
 
 .dotnet
 .DS_Store
@@ -32,4 +34,4 @@ out/offline-kit/web/**/*
 **/.cache/**/*
 **/dist/**/*
 tmp/**/*
-build/
+build/