diff --git a/conductor/tracks/data_oriented_optimization_20260312/plan.md b/conductor/tracks/data_oriented_optimization_20260312/plan.md
index ee3c8c3..6942242 100644
--- a/conductor/tracks/data_oriented_optimization_20260312/plan.md
+++ b/conductor/tracks/data_oriented_optimization_20260312/plan.md
@@ -1,7 +1,7 @@
 # Implementation Plan: Data-Oriented Python Optimization Pass
 
 ## Phase 1: Guidelines and Instrumentation
-- [ ] Task: Update `conductor/product-guidelines.md` with Data-Oriented Python heuristics and the "less Python does the better" philosophy.
+- [x] Task: Update `conductor/product-guidelines.md` with Data-Oriented Python heuristics and the "less Python does the better" philosophy. (fbaef6c)
 - [ ] Task: Review existing profiling instrumentation in `src/performance_monitor.py` or diagnostic hooks.
 - [ ] Task: Expand profiling instrumentation to capture more detailed execution times for non-GUI data structures/processes if necessary.
 - [ ] Task: Conductor - User Manual Verification 'Phase 1: Guidelines and Instrumentation' (Protocol in workflow.md)