chore: stabilize CI, faiss, metadata, docker, and simeon (#25)
- CI warm: ccache dep, continue-on-error, 60min timeout, YAMS_DISABLE_FAISS
- Faiss: YAMS_HAS_FAISS guard, Apple Clang disable, OpenMP detection
- Metadata: retry constraint failures, deduplicate batch UPSERT entries
- Docker: wget for Zig, gfortran, YAMS_DISABLE_FAISS=1
- CI config: free-disk-space v1.3.1, libomp-18-dev, experimental trigger
- Weekly benchmarks: faiss disable, ccache, diagnostics capture
- Simeon: bump to 7763a97, EntropyRouter, concept_count
- CorpusStats: extraction readiness fields
- Remove committed artifacts (.wrangler, .artifacts, dispatcher_external)
- Fix .vscode/settings.json hardcoded path
Signed-off-by: trvon <git@trevon.dev>
72647bbaf7