chore: record journal

.trellis/workspace/dingkang/index.md

@@ -8,7 +8,7 @@
 
 <!-- @@@auto:current-status -->
 - **Active File**: `journal-1.md`
-- **Total Sessions**: 3
+- **Total Sessions**: 4
 - **Last Active**: 2026-08-03
 <!-- @@@/auto:current-status -->
 
@@ -19,7 +19,7 @@
 <!-- @@@auto:active-documents -->
 | File | Lines | Status |
 |------|-------|--------|
-| `journal-1.md` | ~70 | Active |
+| `journal-1.md` | ~91 | Active |
 <!-- @@@/auto:active-documents -->
 
 ---
@@ -29,6 +29,7 @@
 <!-- @@@auto:session-history -->
 | # | Date | Title | Commits | Branch |
 |---|------|-------|---------|--------|
+| 4 | 2026-08-03 | Extract fountain module | `6271055` | `main` |
 | 3 | 2026-08-03 | Archive osmassets refactor plan | `6882921` | `main` |
 | 2 | 2026-08-03 | Refactor Cesium material export contract | `0635c09` | `main` |
 | 1 | 2026-08-03 | Initialize Trellis project guidelines | `4c5981c` | `main` |

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

@@ -68,3 +68,24 @@ Moved durable conclusions from the temporary osmassets refactor plan into change
 ### Status
 
 [OK] **Completed**
+
+
+## Session 4: Extract fountain module
+
+**Date**: 2026-08-03
+**Task**: Extract fountain module
+**Branch**: `main`
+
+### Summary
+
+Moved fountain assembly from generate_scene.py into blender/osmassets/fountain.py, updated P2 refactor docs, and verified py_compile, 51 pure tests, and Blender/Cesium parity before/after with identical snapshots.
+
+### Git Commits
+
+| Hash | Message |
+|------|---------|
+| `6271055` | (see git log) |
+
+### Status
+
+[OK] **Completed**