Apply Level 11.4 rewind execution candidate for Sample C

- Validates rewind execution and deterministic replay in network_sample_c
- Confirms timeline truncation and replay repopulation behavior
- Confirms replay status is surfaced through debug outputs
- Preserves strict sample-only scope with no engine-core changes

Validation:
- imports pass
- rewind prep reaches ready
- replay executes successfully
- bounded timeline remains correct after replay

Author: DavidQ

docs/dev/APPLY_VALIDATION_SPEC.md

@@ -0,0 +1,22 @@
+# Apply Validation Spec
+
+## Required Validation
+1. Import checks pass for:
+   - games/network_sample_c/main.js
+   - games/network_sample_c/game/FakeDivergenceTraceNetworkModel.js
+   - games/network_sample_c/game/NetworkSampleCScene.js
+   - games/network_sample_c/game/StateTimelineBuffer.js
+   - games/network_sample_c/game/ReconciliationLayerAdapter.js
+   - games/network_sample_c/debug/networkSampleCDebug.js
+
+2. Smoke validation confirms:
+   - rewind prep status becomes `ready` under divergence
+   - replay executes successfully
+   - replayed frame count is greater than zero when divergence exists
+   - timeline buffer remains bounded after replay
+   - timeline snapshots after anchor frame are replaced by replayed results
+
+3. Manual validation in sample page:
+   - `W` refreshes rewind-prep state
+   - `X` executes rewind replay
+   - debug panel shows replay status and timeline state

docs/dev/CODEX_COMMANDS.md

@@ -2,14 +2,15 @@ MODEL: GPT-5.3-codex
 REASONING: high
 
 COMMAND:
-Implement rewind execution and deterministic replay in network_sample_c only.
+Apply and validate the existing Level 11.4 rewind execution implementation in `games/network_sample_c` only.
 
-- Use StateTimelineBuffer
-- Use ReconciliationLayerAdapter outputs
-- Restore frame, replay inputs forward
-- Update timeline after replay
+Perform:
+- targeted import checks
+- targeted smoke checks for rewind prep and replay
+- manual validation support for W/X controls and debug outputs
+- surgical fixes only if validation reveals a defect
 
 DO NOT:
-- Modify engine core
-- Create or modify documentation
-- Expand beyond sample scope
+- modify engine core APIs
+- create or edit documentation
+- expand scope beyond `network_sample_c`

docs/dev/COMMIT_COMMENT.txt

@@ -1,13 +1,12 @@
-Implement rewind execution and deterministic replay for Level 11
+Apply Level 11.4 rewind execution candidate for Sample C
 
-- Adds rewind-to-frame execution using timeline buffer
-- Replays inputs forward deterministically
-- Updates timeline after replay
-- Extends debug surfaces to visualize replay path
+- Validates rewind execution and deterministic replay in network_sample_c
+- Confirms timeline truncation and replay repopulation behavior
+- Confirms replay status is surfaced through debug outputs
+- Preserves strict sample-only scope with no engine-core changes
 
 Validation:
-- Rewind restores correct frame
-- Replay produces consistent results
-- Timeline updates correctly
-
-No engine-core or shared system changes
+- imports pass
+- rewind prep reaches ready
+- replay executes successfully
+- bounded timeline remains correct after replay

docs/dev/INTEGRATION_NOTES.md

@@ -0,0 +1,13 @@
+# Integration Notes
+
+## Expected Boundaries
+- `StateTimelineBuffer` remains sample-scoped
+- `ReconciliationLayerAdapter` remains an adapter layer, not engine API
+- Model owns input-history capture and replay execution
+- Scene owns user-facing trigger bindings only
+- Debug plugin consumes model state and does not compute replay logic
+
+## Non-Goals
+- No rollback netcode across shared engine
+- No server reconciliation service
+- No Docker or dashboard work

docs/dev/ROLLBACK_GUARDRAILS.md

@@ -0,0 +1,14 @@
+# Rollback Guardrails
+
+## Guardrails
+- Replay path must be deterministic
+- Replay path must use recorded inputs, not live input sampling
+- Timeline truncation must occur before repopulation
+- Replay must restore from anchor snapshot, not current divergent state
+- Buffer size limits must remain enforced after replay
+
+## Failure Indicators
+- Replay result differs across repeated identical runs
+- Timeline grows without bound
+- Debug panel reports replay success but timeline does not update
+- Authoritative correction mutates state directly without replay

docs/dev/reports/change_summary.txt

@@ -1 +1 @@
-Adds Level 11.4 rewind execution and replay specifications
+Adds APPLY_PR bundle for Level 11.4 rewind execution validation and guarded integration in Sample C.

docs/dev/reports/file_tree.txt

@@ -1,11 +1,10 @@
 docs/
   pr/
-    BUILD_PR_LEVEL_11_4_REWIND_EXECUTION.md
+    APPLY_PR_LEVEL_11_4_REWIND_EXECUTION_CANDIDATE.md
   dev/
-    REWIND_EXECUTION_SPEC.md
-    DETERMINISTIC_REPLAY_RULES.md
-    TIMELINE_UPDATE_SPEC.md
-    DEBUG_REPLAY_VISUALS.md
+    APPLY_VALIDATION_SPEC.md
+    INTEGRATION_NOTES.md
+    ROLLBACK_GUARDRAILS.md
     codex_commands.md
     commit_comment.txt
     reports/

docs/dev/reports/validation_checklist.txt

@@ -1,4 +1,5 @@
-- Docs-only bundle
-- No engine-core changes
-- Sample-scoped implementation instructions
-- Matches repo structure
+- Docs-only APPLY bundle
+- No engine-core scope
+- No documentation delegated to Codex
+- Validation focused on Sample C rewind execution only
+- Repo structure preserved

docs/pr/APPLY_PR_LEVEL_11_4_REWIND_EXECUTION_CANDIDATE.md

@@ -0,0 +1,22 @@
+# APPLY PR LEVEL 11.4 — Rewind Execution Candidate
+
+## Objective
+Apply and validate the Level 11.4 rewind execution implementation in `network_sample_c` without expanding scope.
+
+## Apply Scope
+- Confirm Sample C rewind execution is integrated and runnable
+- Confirm deterministic replay behavior under repeated inputs
+- Confirm timeline truncation and repopulation work as intended
+- Confirm debug outputs reflect replay status and bounded history
+
+## Constraints
+- No engine-core changes
+- No docs changes by Codex
+- No expansion beyond `games/network_sample_c/*`
+
+## Acceptance Summary
+- Rewind-prep can reach `ready`
+- Rewind execution returns success
+- Replay frame count is reported
+- Timeline remains bounded after replay
+- Debug output reflects replay state consistently

games/network_sample_c/index.html

@@ -69,7 +69,7 @@ <h1>Network Sample C - Divergence / Trace Validation</h1>
     <canvas id="game" width="960" height="720"></canvas>
     <section>
       <h3>Controls</h3>
-      <p><code>Space</code>/<code>Enter</code> add manual trace marker. <code>D</code> inject mismatch. <code>R</code> request reconcile. <code>W</code> refresh rewind prep. <code>V</code> run validation.</p>
+      <p><code>Space</code>/<code>Enter</code> add manual trace marker. <code>D</code> inject mismatch. <code>R</code> request reconcile. <code>W</code> refresh rewind prep. <code>X</code> execute rewind replay. <code>V</code> run validation.</p>
     </section>
     <section>
       <h3>Network Commands</h3>