chore: record journal

.trellis/workspace/dingkang/index.md

@@ -8,7 +8,7 @@
 
 <!-- @@@auto:current-status -->
 - **Active File**: `journal-1.md`
-- **Total Sessions**: 1
+- **Total Sessions**: 2
 - **Last Active**: 2026-08-03
 <!-- @@@/auto:current-status -->
 
@@ -19,7 +19,7 @@
 <!-- @@@auto:active-documents -->
 | File | Lines | Status |
 |------|-------|--------|
-| `journal-1.md` | ~28 | Active |
+| `journal-1.md` | ~49 | Active |
 <!-- @@@/auto:active-documents -->
 
 ---
@@ -29,6 +29,7 @@
 <!-- @@@auto:session-history -->
 | # | Date | Title | Commits | Branch |
 |---|------|-------|---------|--------|
+| 2 | 2026-08-03 | Refactor Cesium material export contract | `0635c09` | `main` |
 | 1 | 2026-08-03 | Initialize Trellis project guidelines | `4c5981c` | `main` |
 <!-- @@@/auto:session-history -->
 

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

@@ -26,3 +26,24 @@ Initialized Trellis project scaffolding and replaced the incorrect frontend spec
 ### Status
 
 [OK] **Completed**
+
+
+## Session 2: Refactor Cesium material export contract
+
+**Date**: 2026-08-03
+**Task**: Refactor Cesium material export contract
+**Branch**: `main`
+
+### Summary
+
+Moved Cesium material export overrides into catalog-backed material contracts saved as Blender material custom properties. Kept legacy name-table fallback for old .blend files, updated Blender/spec guidance, and verified with unit tests, py_compile, diff check, and parity before/after comparison showing only expected cesium_export blend property diffs.
+
+### Git Commits
+
+| Hash | Message |
+|------|---------|
+| `0635c09` | (see git log) |
+
+### Status
+
+[OK] **Completed**