Promote Level 21 overlay system to baseline.

PR Details:
- Marks completion of Level 21

Author: DavidQ

docs/dev/CODEX_COMMANDS.md

@@ -1,8 +1,7 @@
 MODEL: GPT-5.4
-REASONING: medium
+REASONING: low
 
 COMMAND:
-Run full Level 21 validation:
-- Validate all features
-- Confirm stability
-- Update roadmap status only
+Promote Level 21 overlay system to baseline.
+Update roadmap status only.
+Package ZIP to <project folder>/tmp/

docs/dev/COMMIT_COMMENT.txt

@@ -1,4 +1,4 @@
-Validate Level 21 overlay system.
+Promote Level 21 overlay system to baseline.
 
 PR Details:
-- Full system validation for advanced overlays
+- Marks completion of Level 21

docs/dev/reports/validation_checklist.txt

@@ -1,4 +1,3 @@
-[ ] All features validated
-[ ] No regressions
 [ ] Stable
+[ ] No regressions
 [ ] Roadmap updated

docs/dev/roadmaps/MASTER_ROADMAP_HIGH_LEVEL.md

@@ -633,6 +633,7 @@
 - [x] Scene graph inspector
 - [x] Level 17 debug overlay baseline promoted after validation (1708-1713: bottom-right placement, KeyG cycle key, correct stack ordering)
 - [x] Level 18 overlay system baseline promoted after validation (input, mission, telemetry integration; no Level 17/18 overlay regressions)
+- [x] Level 21 overlay system baseline promoted after validation (context-aware behavior, synchronized state, event-driven updates, and performance optimization; no Level 17/19 overlay regressions)
 
 ### Sample Phase Tracks
 - [x] 3D phase normalized

docs/pr/BUILD_PR.md

@@ -1,20 +1,18 @@
-# BUILD_PR_LEVEL_21_6_OVERLAY_SYSTEM_VALIDATION
+# BUILD_PR_LEVEL_21_7_OVERLAY_PROMOTE_BASELINE
 
 ## Purpose
-Perform full validation of Level 21 overlay system.
+Promote validated Level 21 overlay system to baseline.
 
 ## Roadmap Improvement
-Confirms stability and readiness of advanced overlay features.
+Marks Level 21 complete and stable.
 
 ## Scope
-- Validate all Level 21 features
-- Ensure no regressions
+- Promote current implementation
+- Ensure no regression
 
 ## Test Steps
-1. Run all advanced overlays
-2. Stress test system
-3. Validate performance and behavior
+1. Run advanced overlays
+2. Confirm stability
 
 ## Expected
-- Stable system
-- No regressions
+- Stable baseline