diff --git a/conductor/tracks/fix_rrule_until_conversion_20260219/plan.md b/conductor/tracks/fix_rrule_until_conversion_20260219/plan.md
index 61a0f24..89c356f 100644
--- a/conductor/tracks/fix_rrule_until_conversion_20260219/plan.md
+++ b/conductor/tracks/fix_rrule_until_conversion_20260219/plan.md
@@ -6,12 +6,12 @@
     - [x] Run the test and confirm it fails with `Error: Invalid UNTIL value: [object Object]`.
 - [x] Task: Conductor - User Manual Verification 'Reproduction' (Protocol in workflow.md)
 
-## Phase 2: Fix Implementation
+## Phase 2: Fix Implementation [checkpoint: 0f334b2]
 - [x] Task: Implement value formatting logic in `icalendar.ts` 331d0ab
     - [x] Update `expandRecurrences` to use a helper for property value conversion.
     - [x] Ensure `Date` objects are formatted as `YYYYMMDDTHHMMSSZ`.
     - [x] Run the test to confirm it passes.
-- [ ] Task: Conductor - User Manual Verification 'Fix Implementation' (Protocol in workflow.md)
+- [x] Task: Conductor - User Manual Verification 'Fix Implementation' (Protocol in workflow.md)
 
 ## Phase 3: Verification & Cleanup
 - [ ] Task: Full Regression Check