diff --git a/conductor/tracks/result_migration_small_files_20260617/plan.md b/conductor/tracks/result_migration_small_files_20260617/plan.md
index 5f1c47f2..44703a51 100644
--- a/conductor/tracks/result_migration_small_files_20260617/plan.md
+++ b/conductor/tracks/result_migration_small_files_20260617/plan.md
@@ -256,7 +256,7 @@ The 35 SMALL files are batched 5-7 per commit (per the umbrella spec). The 2 MED
 
 ### Phase 8: MEDIUM files (2 files, dedicated commits per umbrella)
 
-- [ ] **Task 8.1: Migrate `src/session_logger.py` (8 sites)**
+- [x] **Task 8.1: Migrate `src/session_logger.py` (8 sites)** [c329c869] 
   - WHERE: `src/session_logger.py:99, 131, 147, 160, 188, 201, 226, 245`
   - WHAT: All 8 sites are migration-target; convert each to `Result[T]`
   - HOW: `manual-slop_get_file_slice` for each site; convert