# Add area quality gate

## Goal

Add a lightweight check:area command that turns diagnostics and manifests into pass/fail quality gates.

## Requirements

- Add a lightweight `check:area` npm command for an area quality gate.
- The command must not run QGIS, Blender, Cesium, compression, or rebuild stages.
- The command must reuse the same diagnostics source of truth used by
  `diagnose:area`; avoid duplicating OSM parsing, artifact checks, GLB budget
  checks, or manifest stale checks.
- The first quality gate must fail on:
  - invalid or missing OSM bounds
  - malformed building multipolygon relations
  - missing baseline GLB / metadata / Cesium preview artifacts
  - invalid metadata JSON
  - GLB size / node / image budgets exceeded
  - missing, invalid, or stale expected stage manifests
- Missing QGIS preview remains a warning in this first version.
- The command must print a concise pass/fail report and use exit code `0` for
  pass and `1` for fail.
- README and pipeline spec must document command usage and failure policy.

## Acceptance Criteria

- [x] `npm run check:area -- --config config/areas/nantaizi-lake-innovation-valley.json`
      passes against current nantaizi outputs.
- [x] The check report includes pass/fail counts and any warning lines.
- [x] `check:area` exits non-zero for a deliberately impossible missing-output
      config or equivalent controlled failure case.
- [x] `diagnose:area` still works after any shared diagnostics refactor.
- [x] Syntax checks pass for changed Node scripts.
- [x] README and Trellis pipeline spec document `check:area`.

## Notes

- Keep `prd.md` focused on requirements, constraints, and acceptance criteria.
- Lightweight tasks can remain PRD-only.
- For complex tasks, add `design.md` for technical design and `implement.md` for execution planning before `task.py start`.