feat: Add RustFS artifact object store and migration tool

- Implemented RustFsArtifactObjectStore for managing artifacts in RustFS.
- Added unit tests for RustFsArtifactObjectStore functionality.
- Created a RustFS migrator tool to transfer objects from S3 to RustFS.
- Introduced policy preview and report models for API integration.
- Added fixtures and tests for policy preview and report functionality.
- Included necessary metadata and scripts for cache_pkg package.

src/StellaOps.Scanner.Analyzers.Lang/SPRINTS_LANG_IMPLEMENTATION_PLAN.md

@@ -37,6 +37,7 @@ All sprints below assume prerequisites from SP10-G2 (core scaffolding + Java ana
   - Usage hint propagation tests (EntryTrace → analyzer → SBOM).
   - Metrics counters (`scanner_analyzer_python_components_total`) documented.
 - **Progress (2025-10-21):** Python analyzer landed; Tasks 10-303A/B/C are DONE with dist-info parsing, RECORD verification, editable install detection, and deterministic `simple-venv` fixture + benchmark hooks recorded.
+- **Progress (2025-10-23):** Closed Tasks 10-307P/308P/309P – Python analyzer now emits quiet-provenance metadata via shared helpers, determinism harness covers `simple-venv`, `pip-cache`, and `layered-editable` fixtures, bench suite reports hash throughput (`python/hash-throughput-20251023.csv`), and Offline Kit docs list the Python plug-in in the language bundle manifest.
 
 ## Sprint LA3 — Go Analyzer & Build Info Synthesis (Tasks 10-304, 10-307, 10-308, 10-309 subset)
 - **Scope:** Extract Go build metadata from `.note.go.buildid`, embedded module info, and fallback to `bin:{sha256}`; surface VCS provenance.