v1.12.0 — Anomaly model status API

✨ Added

• `GET /api/anomaly/models` — reports each metric's Layer 2 (anomaly digest) training status: when it last trained, how many rows it used, and its current alert threshold. Lets anyone monitoring the app check on the anomaly model without a database client.

📝 Docs

• `docs/DESIGN_SPEC.md` §11.6 documents the new endpoint and what it deliberately leaves out (fitted model coefficients, which have no meaning outside the app itself).