diff --git a/conductor/tracks/mma_core_engine_20260224/plan.md b/conductor/tracks/mma_core_engine_20260224/plan.md
index 3cd69aa..0156981 100644
--- a/conductor/tracks/mma_core_engine_20260224/plan.md
+++ b/conductor/tracks/mma_core_engine_20260224/plan.md
@@ -1,6 +1,6 @@
 # Implementation Plan: MMA Core Engine Implementation
 
-## Phase 1: Track 1 - The Memory Foundations (AST Parser)
+## Phase 1: Track 1 - The Memory Foundations (AST Parser) [checkpoint: ac31e41]
 - [x] Task: Dependency Setup (8fb75cc)
     - [x] Add `tree-sitter` and `tree-sitter-python` to `pyproject.toml` / `requirements.txt` (8fb75cc)
 - [x] Task: Core Parser Class (7a609ca)