diff --git a/.trellis/workspace/dingkang/index.md b/.trellis/workspace/dingkang/index.md
index eb59ccb..414805b 100644
--- a/.trellis/workspace/dingkang/index.md
+++ b/.trellis/workspace/dingkang/index.md
@@ -8,8 +8,8 @@
 
 <!-- @@@auto:current-status -->
 - **Active File**: `journal-1.md`
-- **Total Sessions**: 13
-- **Last Active**: 2026-08-03
+- **Total Sessions**: 14
+- **Last Active**: 2026-08-04
 <!-- @@@/auto:current-status -->
 
 ---
@@ -19,7 +19,7 @@
 <!-- @@@auto:active-documents -->
 | File | Lines | Status |
 |------|-------|--------|
-| `journal-1.md` | ~280 | Active |
+| `journal-1.md` | ~301 | Active |
 <!-- @@@/auto:active-documents -->
 
 ---
@@ -29,6 +29,7 @@
 <!-- @@@auto:session-history -->
 | # | Date | Title | Commits | Branch |
 |---|------|-------|---------|--------|
+| 14 | 2026-08-04 | Add area diagnostics command | `d4c3baf` | `main` |
 | 13 | 2026-08-03 | Fix OSM multipolygon buildings | `95f8458` | `main` |
 | 12 | 2026-08-03 | Optional GLB compression stage | `7ba8594` | `main` |
 | 11 | 2026-08-03 | Adopt Shapespark vegetation | `dbb5705` | `main` |
diff --git a/.trellis/workspace/dingkang/journal-1.md b/.trellis/workspace/dingkang/journal-1.md
index ee74ee5..8bfa1f8 100644
--- a/.trellis/workspace/dingkang/journal-1.md
+++ b/.trellis/workspace/dingkang/journal-1.md
@@ -278,3 +278,24 @@ Parsed building multipolygon relations, generated building holes, and respected
 ### Status
 
 [OK] **Completed**
+
+
+## Session 14: Add area diagnostics command
+
+**Date**: 2026-08-04
+**Task**: Add area diagnostics command
+**Branch**: `main`
+
+### Summary
+
+Added a fast diagnose:area command for OSM structure, building relation health, artifact status, and GLB digest checks; shared area config normalization between build and diagnostics.
+
+### Git Commits
+
+| Hash | Message |
+|------|---------|
+| `d4c3baf` | (see git log) |
+
+### Status
+
+[OK] **Completed**