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.

bench/Scanner.Analyzers/lang/README.md

@@ -23,3 +23,9 @@ Results should be committed as deterministic CSV/JSON outputs with accompanying
 - Scenario `dotnet_multirid_fixture` exercises the .NET analyzer against the multi-RID test fixture that merges two applications and four runtime identifiers. Latest baseline run (Release build, 5 iterations) records a mean duration of **29.19 ms** (p95 106.62 ms, max 132.30 ms) with a stable component count of 2.
 - Syft v1.29.1 scanning the same fixture (`syft scan dir:…`) averaged **1 546 ms** (p95 ≈2 100 ms, max ≈2 100 ms) while also reporting duplicate packages; raw numbers captured in `dotnet/syft-comparison-20251023.csv`.
 - The new scenario is declared in `bench/Scanner.Analyzers/config.json`; rerun the bench command above after rebuilding analyzers to refresh baselines and comparison data.
+
+## Sprint LA2 — Python Analyzer Benchmark Notes (2025-10-23)
+
+- Added two Python scenarios to `config.json`: the virtualenv sample (`python_site_packages_scan`) and the RECORD-heavy pip cache fixture (`python_pip_cache_fixture`).
+- Baseline run (Release build, 5 iterations) records means of **5.64 ms** (p95 18.29 ms) for the virtualenv and **5.86 ms** (p95 13.29 ms) for the pip cache verifier; raw numbers stored in `python/hash-throughput-20251023.csv`.
+- The pip cache fixture exercises `PythonRecordVerifier` with 12 RECORD rows (7 hashed) and mismatched layer coverage, giving a repeatable hash-validation throughput reference for regression gating.