Validate engine import baseline and confirm contract stability

Author: DavidQ

docs/dev/CODEX_COMMANDS.md

@@ -2,28 +2,15 @@ MODEL: GPT-5.3-codex
 REASONING: low
 
 COMMAND:
-Execute BUILD_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT.
+Execute APPLY_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT_VALIDATE.
 
-Do not ask for clarification.
+Do NOT modify runtime files.
 
-Create exactly:
-- docs/dev/reports/engine_import_baseline_report.md
-- docs/dev/reports/engine_import_contract_decision.md
-- docs/dev/reports/BUILD_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT_report.md
-- docs/dev/reports/validation_checklist.txt
+Steps:
+1. Verify required reports exist
+2. Verify no runtime changes occurred
+3. Validate contract decision clarity
+4. Create validation report
 
-Required work:
-1. Baseline current `/src/engine/` usage across src/, games/, samples/, tools/, and relevant HTML files.
-2. Summarize whether the current import style is already a stable baseline contract.
-3. Do NOT rewrite imports in this PR.
-4. Do NOT move files or folders.
-5. Do NOT touch templates/archive lanes.
-6. Do NOT change anything under:
-   - docs/dev/start_of_day/chatGPT/
-   - docs/dev/start_of_day/codex/
-
-If exact roadmap lines already exist and are justified by findings, bracket-only state updates are allowed.
-Otherwise, record unapplied delta and leave roadmap wording untouched.
-
-Package output to:
-<project folder>/tmp/BUILD_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT.zip
+Output:
+<project folder>/tmp/APPLY_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT_VALIDATE.zip

docs/dev/COMMIT_COMMENT.txt

@@ -1 +1 @@
-Baseline current /src/engine import usage and record the active engine import contract
+Validate engine import baseline and confirm contract stability

docs/dev/reports/APPLY_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT_VALIDATE_report.md

@@ -0,0 +1,27 @@
+# APPLY_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT_VALIDATE Report
+
+Generated: 2026-04-12
+
+## Step 1: Required Report Existence
+- `docs/dev/reports/engine_import_baseline_report.md`: PASS
+- `docs/dev/reports/engine_import_contract_decision.md`: PASS
+- `docs/dev/reports/BUILD_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT_report.md`: PASS
+- `docs/dev/reports/validation_checklist.txt`: PASS
+
+## Step 2: Runtime Change Verification
+- Check executed: `git diff --name-only -- src games samples tools`
+- Result: no entries
+- Validation: PASS (no current runtime file modifications detected)
+
+## Step 3: Contract Decision Clarity
+Validated decision document contains clear contract sections:
+- `## Decision`
+- `## Contract Summary`
+- `## Justification`
+- `## Decision Outcome`
+
+Validation: PASS (decision is explicit and actionable)
+
+## Outcome
+- APPLY validation completed.
+- No runtime files modified in this APPLY lane.

docs/dev/reports/validation_checklist.txt

@@ -1,32 +1,5 @@
-BUILD_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT
-Validation Checklist
-Generated: 2026-04-12
-
-[PASS] baseline scan completed across required directories
-Evidence:
-- scanned `src/`, `games/`, `samples/`, `tools/` for `/src/engine/` usage
-- included HTML-specific scan under same areas
-
-[PASS] baseline report created
-Evidence:
-- `docs/dev/reports/engine_import_baseline_report.md`
-
-[PASS] contract decision created
-Evidence:
-- `docs/dev/reports/engine_import_contract_decision.md`
-
-[PASS] BUILD report created
-Evidence:
-- `docs/dev/reports/BUILD_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT_report.md`
-
-[PASS] no import rewrites performed
-Evidence:
-- lane executed as scan+docs-only baseline/decision pass
-
-[PASS] no move/delete operations performed
-Evidence:
-- lane executed as docs-only reporting pass
-
-[PASS] protected start_of_day directories untouched
-Evidence:
-- `git diff --name-only -- docs/dev/start_of_day/chatGPT docs/dev/start_of_day/codex` -> no entries
+[ ] baseline report exists
+[ ] contract decision exists
+[ ] no runtime changes
+[ ] no start_of_day changes
+[ ] validation report created

docs/pr/APPLY_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT_VALIDATE.md

@@ -0,0 +1,21 @@
+# APPLY_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT_VALIDATE
+
+## Purpose
+Validate the baseline engine import contract and lock results.
+
+## Scope
+Validation only. No code changes.
+
+## Required Checks
+1. Confirm baseline report exists
+2. Confirm contract decision exists
+3. Confirm no runtime files changed
+4. Confirm no start_of_day changes
+5. Confirm contract decision is explicit
+
+## Output
+docs/dev/reports/engine_import_baseline_validation.md
+docs/dev/reports/validation_checklist.txt
+
+Package:
+<project folder>/tmp/APPLY_PR_ENGINE_IMPORT_BASELINE_AND_CONTRACT_VALIDATE.zip