saptak-preview

Add a new pack to Saptak. Walks every required touchpoint in docs/PACK_CONTRACT.md — pack directory scaffolding, compose services (seeder + dbt-runner + rag-seeder + graph-populator + streamer), OPA action prefix, six `*_PACK_*` dict entries in layer_details.py, queries.py SQL constants, workflows.py workflow + activities, main.py endpoints + worker registration, L2 broadcast + SSE endpoint, frontend PACKS + PACK_L7 + SVG dicts + PACK_L2_FEED + ROW_RENDERERS, style.css theme, acceptance test registration. Verifies via boot validator + pack_contract_completeness.py + pack_modality_completeness.py + the full make verify suite. Use when: "add a pack", "create a new pack", "scaffold pack <name>".

Run the Saptak verification suite. Picks the right depth based on what's asked: `make verify` (95s) against the running stack for routine checks; `make verify-clean-rebuild` (10 min) for the reviewer-grade from-empty proof; or just `pack_contract_completeness.py` (3s, no Docker) for fast static checks. Surfaces failures with the exact file/cell so the user can fix + re-run. Use when: "verify", "run verification", "check the demo", "make sure it still works", "is X still passing?".