feat(api,ui): ForecastOps Control Center — read-only ops slice + /ops page

[w7-mgfcode]

Closes #217. Implements PRP-24 — ForecastOps Control Center (PRPs/PRP-24-forecastops-control-center.md).

What

A new operator-facing dashboard that connects ForecastLabAI's isolated Explorer/Visualize pages into one workflow.

Backend — new read-only vertical slice app/features/ops/:

• GET /ops/summary — system health, job/run status histograms, alias health, data freshness, and a "needs attention" list (recent failed jobs/runs + stale aliases).
• GET /ops/retraining-candidates?limit= — (store, product) queue ranked by a deterministic retraining-priority score (blends staleness + WAPE). limit bounded [1, 100] → 422 outside.
• No models.py, no Alembic migration — read-only, mirrors the analytics slice.

Frontend — new /ops Control Center page:

• pages/ops.tsx with 5 sections (System Health, KPI row, Data Freshness, Needs Attention table, Retraining Queue table); wired into the top nav as "Control Center".
• hooks/use-ops.ts (useOpsSummary polls every 15s; useRetrainingCandidates no polling), pure lib/ops-utils.ts helpers (+ vitest), Ops* response types.
• Reuses existing KPICard / StatusBadge / Card / Table / loading-error-empty components, getStatusVariant, and the existing useProviderHealth hook.

⚠️ Vision tension — cross-slice ORM import (called out per .claude/rules/product-vision.md)

app/features/ops/service.py imports the ORM models of three sibling slices — jobs (Job), registry (ModelRun, DeploymentAlias), and data_platform (SalesDaily) — to run server-side select() aggregation. This is a deliberate, accepted tension with the "a slice may NOT import from another slice" rule (AGENTS.md § Architecture), and was locked during PRP-24 planning (decision #1):

• The import surface is restricted to ORM models + read-only select() — no sibling service.py or schemas.py is ever imported.
• data_platform ORM is already a sanctioned cross-slice import (the analytics slice uses it); importing jobs/registry ORM is the new tension.
• The chosen alternative over an ASGITransport in-process-HTTP approach (the demo slice's pattern) — server-side SQL aggregation is the right tool for a read-only ops view.
• No CI import-linter enforces slice boundaries, so this does not fail the build — hence this explicit callout.

The Control Center operationalises the Measure + Manage functions of the NIST AI RMF; the alias-staleness check follows the MLflow alias-governance pattern.

Validation

• ruff check + ruff format --check — clean
• mypy app/ + pyright app/ — clean (--strict)
• pytest -m "not integration" — 1144 passed
• pytest -m integration app/features/ops/ — 6 passed
• frontend tsc --noEmit + lint + test --run — clean, 66 passed
• Manual: all four endpoints behave per Success Criteria; /ops page dogfooded in a browser (all 5 sections render, nav item present, 0 console errors)

No new dependency, no new table, no Alembic migration.

🤖 Generated with Claude Code

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