diff --git a/.trellis/workspace/dingkang/index.md b/.trellis/workspace/dingkang/index.md
index f5b1b85..d81a5f8 100644
--- a/.trellis/workspace/dingkang/index.md
+++ b/.trellis/workspace/dingkang/index.md
@@ -8,7 +8,7 @@
 
 <!-- @@@auto:current-status -->
 - **Active File**: `journal-1.md`
-- **Total Sessions**: 15
+- **Total Sessions**: 16
 - **Last Active**: 2026-08-04
 <!-- @@@/auto:current-status -->
 
@@ -19,7 +19,7 @@
 <!-- @@@auto:active-documents -->
 | File | Lines | Status |
 |------|-------|--------|
-| `journal-1.md` | ~322 | Active |
+| `journal-1.md` | ~343 | Active |
 <!-- @@@/auto:active-documents -->
 
 ---
@@ -29,6 +29,7 @@
 <!-- @@@auto:session-history -->
 | # | Date | Title | Commits | Branch |
 |---|------|-------|---------|--------|
+| 16 | 2026-08-04 | Add area quality gate | `7fcc4ee` | `main` |
 | 15 | 2026-08-04 | Add GLB stage manifests | `2832383` | `main` |
 | 14 | 2026-08-04 | Add area diagnostics command | `d4c3baf` | `main` |
 | 13 | 2026-08-03 | Fix OSM multipolygon buildings | `95f8458` | `main` |
diff --git a/.trellis/workspace/dingkang/journal-1.md b/.trellis/workspace/dingkang/journal-1.md
index 9ca9a38..1fd18bd 100644
--- a/.trellis/workspace/dingkang/journal-1.md
+++ b/.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**