chore: record journal

.trellis/workspace/dingkang/journal-1.md

@@ -320,3 +320,24 @@ Added first-version cesium and compress stage manifests under _pipeline/stages,
 ### Status
 
 [OK] **Completed**
+
+
+## Session 16: Add area quality gate
+
+**Date**: 2026-08-04
+**Task**: Add area quality gate
+**Branch**: `main`
+
+### Summary
+
+Added a read-only check:area command backed by shared area diagnostics, documented the quality-gate failure policy, and verified nantaizi pass plus controlled missing-output failure.
+
+### Git Commits
+
+| Hash | Message |
+|------|---------|
+| `7fcc4ee` | (see git log) |
+
+### Status
+
+[OK] **Completed**