docs(materializer): Phase 5 opened — survey verdict + 5a/5b/5c slicingVerified

Anthony Green2026-07-02 21:31:55 -0400 8237b248efe34a2e8e25b18f22c36c25e60c92a5
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>