diff --git a/conductor/tracks/clean_install_test_20260603/plan.md b/conductor/tracks/clean_install_test_20260603/plan.md
index 91629c62..6d8f0bf2 100644
--- a/conductor/tracks/clean_install_test_20260603/plan.md
+++ b/conductor/tracks/clean_install_test_20260603/plan.md
@@ -1,22 +1,24 @@
 # Implementation Plan: Clean Install Test (clean_install_test_20260603)
 
-## Phase 1: Add pytest marker
+## Phase 1: Add pytest marker [checkpoint: 573d289]
 Focus: Register the `clean_install` marker in `pyproject.toml` so the test can be selected with `pytest -m clean_install` or filtered with `-m "not clean_install"`.
 
-- [ ] Task 1.1: Pre-edit checkpoint - `git add .`
-- [ ] Task 1.2: Edit `pyproject.toml` to add `clean_install` marker
-- [ ] Task 1.3: Run `pytest --collect-only` to confirm marker is recognized
-- [ ] Task 1.N: Atomic commit + git note
+- [x] Task 1.1: Pre-edit checkpoint - `git add .`
+- [x] Task 1.2: Edit `pyproject.toml` to add `clean_install` marker
+- [x] Task 1.3: Run `pytest --collect-only` to confirm marker is recognized
+- [x] Task 1.N: Atomic commit + git note (573d289)
 
-## Phase 2: Create the test file
+## Phase 2: Create the test file [checkpoint: d171c18]
 Focus: Create `tests/test_clean_install.py` with opt-in clone-and-verify logic.
 
-- [ ] Task 2.1: Pre-edit checkpoint - `git add .`
-- [ ] Task 2.2: Create `tests/test_clean_install.py` using `urllib.request` (deviation from plan, see spec.md)
-- [ ] Task 2.3: Run the test in skip mode - should be 1 skipped
-- [ ] Task 2.N: Atomic commit + git note
+- [x] Task 2.1: Pre-edit checkpoint - `git add .`
+- [x] Task 2.2: Create `tests/test_clean_install.py` using `urllib.request` (deviation from plan, see spec.md)
+- [x] Task 2.3: Run the test in skip mode - should be 1 skipped
+- [x] Task 2.N: Atomic commit + git note (d171c18)
 
 ## Phase 3: Phase Completion Verification
-- [ ] Task 3.1: Run the test in default mode - should be 1 skipped (gating works)
-- [ ] Task 3.2: `pytest --collect-only -m clean_install` confirms marker works
-- [ ] Task 3.N: conductor(checkpoint) commit + audit note
+- [x] Task 3.1: Run the test in default mode - 1 skipped (gating works)
+- [x] Task 3.2: `pytest --collect-only -m clean_install` confirms marker works
+- [x] Task 3.3: Negative marker filter works (-m "not clean_install" deselects the test)
+- [x] Task 3.4: Module imports cleanly
+- [x] Task 3.N: conductor(checkpoint) commit + audit note