chore: record journal

.trellis/workspace/dingkang/index.md

@@ -8,7 +8,7 @@
 
 <!-- @@@auto:current-status -->
 - **Active File**: `journal-1.md`
-- **Total Sessions**: 19
+- **Total Sessions**: 20
 - **Last Active**: 2026-08-04
 <!-- @@@/auto:current-status -->
 
@@ -19,7 +19,7 @@
 <!-- @@@auto:active-documents -->
 | File | Lines | Status |
 |------|-------|--------|
-| `journal-1.md` | ~406 | Active |
+| `journal-1.md` | ~427 | Active |
 <!-- @@@/auto:active-documents -->
 
 ---
@@ -29,6 +29,7 @@
 <!-- @@@auto:session-history -->
 | # | Date | Title | Commits | Branch |
 |---|------|-------|---------|--------|
+| 20 | 2026-08-04 | Split area preview orchestration | `396df51` | `main` |
 | 19 | 2026-08-04 | Add configurable area asset budgets | `463cb06` | `main` |
 | 18 | 2026-08-04 | Add OSM area preflight | `e1f5207` | `main` |
 | 17 | 2026-08-04 | Add full stage manifests | `5874cf9` | `main` |

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

@@ -404,3 +404,24 @@ Added configurable GLB budgets with documented exceptions, shared budget evaluat
 ### Status
 
 [OK] **Completed**
+
+
+## Session 20: Split area preview orchestration
+
+**Date**: 2026-08-04
+**Task**: Split area preview orchestration
+**Branch**: `main`
+
+### Summary
+
+Extracted preview route, vehicle glTF, and HTML/runtime assembly from build-area into focused modules; added preview asset tests and verified nantaizi preview, diagnostics, and quality gate.
+
+### Git Commits
+
+| Hash | Message |
+|------|---------|
+| `396df51` | (see git log) |
+
+### Status
+
+[OK] **Completed**