diff --git a/.trellis/workspace/dingkang/index.md b/.trellis/workspace/dingkang/index.md
index 256203c..e245de7 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**: 2
+- **Total Sessions**: 3
 - **Last Active**: 2026-08-03
 <!-- @@@/auto:current-status -->
 
@@ -19,7 +19,7 @@
 <!-- @@@auto:active-documents -->
 | File | Lines | Status |
 |------|-------|--------|
-| `journal-1.md` | ~49 | Active |
+| `journal-1.md` | ~70 | Active |
 <!-- @@@/auto:active-documents -->
 
 ---
@@ -29,6 +29,7 @@
 <!-- @@@auto:session-history -->
 | # | Date | Title | Commits | Branch |
 |---|------|-------|---------|--------|
+| 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` |
 <!-- @@@/auto:session-history -->
diff --git a/.trellis/workspace/dingkang/journal-1.md b/.trellis/workspace/dingkang/journal-1.md
index cae85c7..87bc75c 100644
--- a/.trellis/workspace/dingkang/journal-1.md
+++ b/.trellis/workspace/dingkang/journal-1.md
@@ -47,3 +47,24 @@ Moved Cesium material export overrides into catalog-backed material contracts sa
 ### Status
 
 [OK] **Completed**
+
+
+## Session 3: Archive osmassets refactor plan
+
+**Date**: 2026-08-03
+**Task**: Archive osmassets refactor plan
+**Branch**: `main`
+
+### Summary
+
+Moved durable conclusions from the temporary osmassets refactor plan into changelog and Trellis specs, removed docs/refactor-plan.md, and verified no live docs/spec references to the deleted plan remain.
+
+### Git Commits
+
+| Hash | Message |
+|------|---------|
+| `6882921` | (see git log) |
+
+### Status
+
+[OK] **Completed**