Validate overlay plugin system.

PR Details:
- Full system validation for Level 20

Author: DavidQ

docs/dev/CODEX_COMMANDS.md

@@ -2,7 +2,7 @@ MODEL: GPT-5.4
 REASONING: medium
 
 COMMAND:
-Implement plugin security boundaries:
-- Restrict unsafe operations
-- Enforce access rules
+Run full plugin system validation:
+- Validate all subsystems
+- Confirm stability
 - Update roadmap status only

docs/dev/COMMIT_COMMENT.txt

@@ -1,5 +1,4 @@
-Add plugin security boundaries.
+Validate overlay plugin system.
 
 PR Details:
-- Restricts unsafe plugin behavior
-- Improves system safety
+- Full system validation for Level 20

docs/dev/reports/validation_checklist.txt

@@ -1,4 +1,4 @@
-[ ] Restrictions enforced
-[ ] No unsafe access
-[ ] Normal plugins unaffected
+[ ] All subsystems validated
+[ ] No regressions
+[ ] System stable
 [ ] Roadmap updated

docs/dev/roadmaps/MASTER_ROADMAP_HIGH_LEVEL.md

@@ -825,6 +825,6 @@
 
 ### Track H — Final Stability Gate
 - [ ] full-repo validation sweep
-- [ ] zero regression requirement
+- [.] zero regression requirement
 - [ ] contract freeze readiness
 - [ ] readiness for long-term maintenance mode

docs/pr/BUILD_PR.md

@@ -1,21 +1,21 @@
-# BUILD_PR_LEVEL_20_8_OVERLAY_PLUGIN_SECURITY_BOUNDARIES
+# BUILD_PR_LEVEL_20_9_OVERLAY_PLUGIN_SYSTEM_VALIDATION
 
 ## Purpose
-Establish security boundaries for overlay plugins.
+Perform full validation of the overlay plugin system.
 
 ## Roadmap Improvement
-Enhances system safety by restricting plugin capabilities.
+Completes Level 20 plugin system readiness.
 
 ## Scope
-- Define allowed plugin operations
-- Restrict unsafe access
-- Validate secure execution
+- Validate registry, lifecycle, isolation, security, limits
+- Confirm no regressions
 
 ## Test Steps
-1. Attempt restricted operations
-2. Verify enforcement
-3. Confirm normal plugin behavior unaffected
+1. Load multiple plugins
+2. Trigger lifecycle events
+3. Test failures and limits
+4. Validate performance metrics
 
 ## Expected
-- Security rules enforced
-- No unsafe access
+- System stable
+- No regressions