Add advanced overlay interactions.

PR Details:
- Introduces interactive overlay elements

Author: DavidQ

docs/dev/CODEX_COMMANDS.md

@@ -1,7 +1,8 @@
 MODEL: GPT-5.4
-REASONING: low
+REASONING: medium
 
 COMMAND:
-Promote Level 21 overlay system to baseline.
-Update roadmap status only.
-Package ZIP to <project folder>/tmp/
+Implement advanced overlay interactions:
+- Add click/drag/resize
+- Maintain gameplay safety
+- Update roadmap status only

docs/dev/COMMIT_COMMENT.txt

@@ -1,4 +1,4 @@
-Promote Level 21 overlay system to baseline.
+Add advanced overlay interactions.
 
 PR Details:
-- Marks completion of Level 21
+- Introduces interactive overlay elements

docs/dev/reports/validation_checklist.txt

@@ -1,3 +1,4 @@
-[ ] Stable
-[ ] No regressions
+[ ] Interaction works
+[ ] No gameplay interference
+[ ] Stable behavior
 [ ] Roadmap updated

docs/dev/roadmaps/MASTER_ROADMAP_HIGH_LEVEL.md

@@ -634,6 +634,7 @@
 - [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)
+- [x] Level 21 advanced overlay interactions implemented (click/drag/resize) with gameplay-safe explicit interaction mode
 
 ### Sample Phase Tracks
 - [x] 3D phase normalized

docs/pr/BUILD_PR.md

@@ -1,18 +1,20 @@
-# BUILD_PR_LEVEL_21_7_OVERLAY_PROMOTE_BASELINE
+# BUILD_PR_LEVEL_22_1_OVERLAY_ADVANCED_INTERACTIONS
 
 ## Purpose
-Promote validated Level 21 overlay system to baseline.
+Introduce advanced user interactions with overlays.
 
 ## Roadmap Improvement
-Marks Level 21 complete and stable.
+Begins Level 22 interaction enhancements.
 
 ## Scope
-- Promote current implementation
-- Ensure no regression
+- Add interactive elements (click, drag, resize)
+- Ensure gameplay compatibility
 
 ## Test Steps
-1. Run advanced overlays
-2. Confirm stability
+1. Interact with overlay elements
+2. Verify behavior
+3. Confirm gameplay unaffected
 
 ## Expected
-- Stable baseline
+- Interactive overlays
+- Stable system