Add automated validation for fullscreen rules.

Ensures no regression beyond sample 0713.
Validates proper fullscreen scaling behavior.

PR: LEVEL 23.9 FULLSCREEN VALIDATION AUTOMATION

Author: DavidQ

docs/dev/codex_commands.md

@@ -1,12 +1,8 @@
 MODEL: GPT-5.3-codex
-REASONING: high
+REASONING: medium
 
 COMMAND:
-- Scan all samples
-- Remove fullscreen usage except sample 0713
-- Fix sample 0713 fullscreen scaling:
-  - Must fill entire screen
-  - Must preserve aspect ratio
-  - No letterboxing or unused space
-- Do NOT modify engine core
-- Package results into repo structure
+- Implement validation scan across samples
+- Report any fullscreen usage outside sample 0713
+- Verify 0713 scaling behavior
+- No engine changes

docs/dev/commit_comment.txt

@@ -1,6 +1,6 @@
-Enforce fullscreen rule across all samples and fix sample 0713 scaling.
+Add automated validation for fullscreen rules.
 
-Locks fullscreen capability to sample 0713 only.
-Adds requirement to fully fill screen while maintaining aspect ratio.
+Ensures no regression beyond sample 0713.
+Validates proper fullscreen scaling behavior.
 
-PR: LEVEL 23.8 FULLSCREEN REGRESSION LOCK + FIX
+PR: LEVEL 23.9 FULLSCREEN VALIDATION AUTOMATION

docs/dev/reports/fullscreen_validation_rules.txt

@@ -0,0 +1,7 @@
+Validation Rules
+
+1. engine.fullscreen must ONLY exist in sample 0713
+2. Any other occurrence = failure
+3. Sample 0713 must:
+   - Fill full screen
+   - Maintain aspect ratio

docs/dev/reports/validation_checklist.txt

@@ -1,8 +1,6 @@
 Validation Checklist
 
-[ ] Only sample 0713 has fullscreen
-[ ] No other sample contains fullscreen flags
-[ ] Sample 0713 fills screen fully (no unused space)
-[ ] Aspect ratio preserved correctly
-[ ] No engine-level fullscreen enforcement added
-[ ] Codex respects rule in future PRs
+[ ] Validation rules defined
+[ ] Violations detectable
+[ ] Sample 0713 validated
+[ ] No false positives

docs/pr/BUILD_PR_LEVEL_23_9_FULLSCREEN_VALIDATION_AUTOMATION.md

@@ -0,0 +1,14 @@
+# BUILD PR LEVEL 23.9
+## Fullscreen Validation Automation
+
+### Purpose
+Automate detection of fullscreen violations across all samples.
+
+### Scope
+- Define validation rule set
+- Ensure only sample 0713 contains fullscreen
+- Detect regressions automatically
+
+### Acceptance
+- Validation detects any fullscreen usage outside 0713
+- Sample 0713 validated for full screen fill + aspect ratio