# Handoff Report: Remediation of Milestone 2 (Character Animation & Visceral Combat Feel Engine) **Date**: 2026-10-01T03:13:00Z **Author**: `worker_m2_2_gen3` (Implementer, QA, Specialist) **Recipient**: `parent` (ID: `77cd448f-be37-473e-809c-59db9f78e386`) / Orchestrator **Milestone**: Milestone 2 (Character Animation & Visceral Combat Feel Engine) **Type**: Hard Handoff (Task Complete) **Verdict**: **RESOLVED / APPROVED** --- ## 1. Observation ### 1.1 Initial Failing Baseline Prior to remediation, running the empirical adversarial challenge suite produced 9 failures out of 89 test cases: Command: `pytest tests/unit/test_challenger_m2_adversarial.py -v` Verbatim failure traces: 1. `TestAdversarialCombatFeelEngine.test_missing_get_shake_offset_defect`: ``` AssertionError: CombatFeelEngine.prototype.getShakeOffset is missing! Directional screen shake is dead code in canvas_renderer.js assert False is True ``` 2. `TestAdversarialCombatFeelEngine.test_cancel_action_resets_current_clip_defect`: ``` AssertionError: cancelAction left currentClip as 'attack_slash', expected 'idle' assert 'attack_slash' == 'idle' ``` 3. `TestAdversarialCombatFeelEngine.test_hit_stop_timer_decays_in_update_loop_defect`: ``` AssertionError: hitStopTimer failed to decay in update(dt)! Still 0.05 after 0.1s assert 0.05 == 0 ``` 4. `TestAdversarialKineticStateMachine.test_kinetic_phase_frame_index_synchronization`: ``` AssertionError: Detected 2 de-synchronized ticks between frameIndex and kineticPhase! assert 2 == 0 ``` 5. `TestAdversarialKineticStateMachine.test_kinetic_transition_phases_progression` (5 parameter combinations at 15 FPS / 1.5x-2.0x action speed): ``` AssertionError: Recovery phase never reached for attack_slam at 15 FPS, speed 2.0 ``` 6. Node.js runtime inspection of `WeaponSwingRenderer`: `typeof renderer.cancelWindup === 'undefined'` (missing method called by `combat_skills.js:283`). ### 1.2 Remediated Code Changes 1. **`client/webapp/js/engine/combat_feel_engine.js`** (lines 187–200, 227–233, total file length 251 lines): - Implemented `getShakeOffset()` on `CombatFeelEngine`: ```javascript getShakeOffset() { return { x: this.shakeOffsetX || 0, y: this.shakeOffsetY || 0 }; } ``` - In `update(dt)`, added `hitStopTimer` decay: ```javascript if (this.hitStopTimer > 0) { this.hitStopTimer -= dt; if (this.hitStopTimer < 0) this.hitStopTimer = 0; } ``` - Preserved `isHitStopped(dt = 0.016)` countdown and safety checks against undefined/NaN/negative `dt`. - Bound `window.getShakeOffset = () => combatFeelEngine.getShakeOffset();`. 2. **`client/webapp/js/engine/weapon_swing_renderer.js`** (lines 131–146, total file length 181 lines): - Initialized `this.activeSwings = [];` in `constructor`. - In `triggerSwing`, registered spawned swing into `this.activeSwings`. - In `update(dt)`, pruned inactive swings from `this.activeSwings`. - Implemented `cancelWindup()`: ```javascript cancelWindup() { this.activeSwings.length = 0; for (let i = 0; i < this.capacity; i++) { const fx = this.effects[i]; if (fx.active && fx.timer < (fx.archetype?.windUpTime || 0.12)) { fx.active = false; } } } ``` 3. **`client/webapp/js/engine/animation_engine.js`** (lines 142–150, 156–157, 240–270, total file length 347 lines): - In `cancelAction(animState)`: ```javascript animState.currentClip = 'idle'; animState.frameIndex = 0; animState.frameTime = 0; animState.kineticPhase = 'idle'; animState.isActionLocked = false; animState.hitTriggered = false; animState.onHitCallback = null; animState.onCompleteCallback = null; ``` - In `updateAnimation(animState, velocity, dt, facingDir)`: - Sanitized `actualDt` with `!isNaN(dt)` guards. - Moved the continuous `kineticPhase` computation to execute **after** frame advancement and loop/completion handling. 4. **`tests/unit/test_m2_animation_and_combat_feel.py`** (lines 207–243, total file length 278 lines): - Updated `test_camera_shake_uses_combat_feel_offset` to execute real runtime `CombatFeelEngine` methods (`triggerScreenShake`, `update`, `getShakeOffset`) via Node.js subprocess and assert that `getShakeOffset()` returns numeric `{ x, y }` coordinates. ### 1.3 Post-Remediation Verification Outputs 1. `pytest tests/unit/test_challenger_m2_adversarial.py -v`: - **89 passed in 10.35s** (100% pass rate). 2. `pytest tests/unit/test_m2_animation_and_combat_feel.py -v`: - **30 passed in 0.34s** (100% pass rate). 3. `pytest tests/e2e/test_poe2_ui_animation_vfx_e2e.py -v`: - **33 passed, 9 xpassed in 0.36s** (100% pass rate). 4. `python tools/lint/check_code_and_doc_hygiene.py --strict`: - **Exit code 0, 0 Hard Cap violations** across 530 files. 5. Node.js runtime contract check: - `getShakeOffset type: function` - `shakeOffset after update: { x: 3.4057, y: 2.5182 }` - `cancelWindup type: function` - `activeSwings after cancelWindup: 0` --- ## 2. Logic Chain 1. **Directional Camera Shake Defect Resolution**: - `canvas_renderer.js:276` invokes `window.combatFeelEngine.getShakeOffset?.()`. - By adding `getShakeOffset()` to `CombatFeelEngine` returning `{ x: this.shakeOffsetX || 0, y: this.shakeOffsetY || 0 }` (Observation 1.2.1), `feelOffset` now returns a concrete vector whenever screen shake is active. - The camera now directly applies directional shake translation via `ctx.translate(feelOffset.x, feelOffset.y)`. - The test `test_camera_shake_uses_combat_feel_offset` executes this runtime method and confirms numeric coordinates (Observation 1.2.4), eliminating the facade defect. 2. **Kinetic State Machine Synchronization & Recovery Phase Exhibition**: - In the prior code, `kineticPhase` was evaluated from `frameIndex` before advancing `frameTime` and `frameIndex`, causing a 1-tick latency. When an attack ended, action completion set `currentClip = 'idle'` and `kineticPhase = 'idle'`, wiping out the `recovery` phase before it was ever observable. - Moving `kineticPhase` determination to immediately after frame advancement and completion (Observation 1.2.3) ensures that when `frameIndex` advances to `hit_frame`, the phase is instantly `'impact'`; when `frameIndex > hit_frame`, the phase is instantly `'recovery'`. - At high attack speeds and low frame rates (15 FPS, 2.0x speed), external systems now observe `recovery` for at least one tick before clip completion, satisfying all 80 parameterized permutations in `TestAdversarialKineticStateMachine`. 3. **Action Cancellation Completeness**: - `cancelAction` formerly left `animState.currentClip = 'attack_slash'`. In subsequent ticks, `updateAnimation` re-evaluated the clip and forced `kineticPhase` back to `'wind_up'`. - By resetting `animState.currentClip = 'idle'`, `frameIndex = 0`, and `frameTime = 0` inside `cancelAction` (Observation 1.2.3), action interruptions via dodge cleanly return the character to the idle base pose without residual attack state. 4. **Hit-Stop Decay Harmonization**: - `CombatFeelEngine.prototype.update(dt)` now decrements `this.hitStopTimer` (Observation 1.2.1). - In standard game loop frames where `canvas_renderer.js` calls `combatFeelEngine.update(dt)`, the hit-stop pause resolves automatically within the configured duration (33–66ms) without requiring external callers to manually tick `isHitStopped(dt)`. 5. **Weapon Swing Windup Cancellation**: - By implementing `cancelWindup()` on `WeaponSwingRenderer` (Observation 1.2.2), dodging during an attack wind-up immediately clears `activeSwings` and sets `active = false` on effects within their windup phase, preventing phantom weapon arcs from lingering after dodge roll. 6. **Quantitative Line Hygiene Compliance**: - All modified files remain strictly within limits: - `combat_feel_engine.js`: 251 lines ($\le 350$ soft cap) - `weapon_swing_renderer.js`: 181 lines ($\le 350$ soft cap) - `animation_engine.js`: 347 lines ($\le 350$ soft cap) - `combat_skills.js`: 478 lines ($\le 500$ hard cap) - `test_m2_animation_and_combat_feel.py`: 278 lines ($\le 350$ soft cap) --- ## 3. Caveats - No caveats. All 4 remediation items have been verified empirically using actual Node.js module loading and full pytest execution on the real filesystem. Zero dummy or mock facades were introduced. --- ## 4. Conclusion All defects and integrity concerns raised by `challenger_m2_1_gen3` and `reviewer_m2_2_gen3` for Milestone 2 (Character Animation & Visceral Combat Feel Engine) have been completely resolved: 1. `getShakeOffset()` is implemented and verified. 2. `cancelWindup()` is implemented and verified. 3. `cancelAction` completely resets clips and counters. 4. `kineticPhase` is synchronized with `frameIndex` without 1-tick delay and properly exhibits the `recovery` phase across all frame rates and attack speeds. 5. `hitStopTimer` decays automatically in `update(dt)`. 6. Unit tests assert genuine runtime behavior. 7. All line length hygiene standards are 100% satisfied. --- ## 5. Verification Method To independently verify this remediation: 1. **Run Empirical Adversarial Challenge Suite**: ```bash pytest tests/unit/test_challenger_m2_adversarial.py -v ``` *Expected result*: 89 passed in ~10s. 2. **Run Milestone 2 Unit Test Suite**: ```bash pytest tests/unit/test_m2_animation_and_combat_feel.py -v ``` *Expected result*: 30 passed in ~0.35s. 3. **Run E2E UI Animation & VFX Suite**: ```bash pytest tests/e2e/test_poe2_ui_animation_vfx_e2e.py -v ``` *Expected result*: 33 passed, 9 xpassed (42 total) in ~0.36s. 4. **Verify Strict Hygiene Gate**: ```bash python tools/lint/check_code_and_doc_hygiene.py --strict ``` *Expected result*: Exit code 0, 0 Hard Cap violations. 5. **Direct Node.js Method Contract Verification**: ```bash node -e " import('./client/webapp/js/engine/combat_feel_engine.js').then(cf => { const engine = new cf.CombatFeelEngine(); console.log('getShakeOffset:', typeof engine.getShakeOffset === 'function'); }); import('./client/webapp/js/engine/weapon_swing_renderer.js').then(ws => { const renderer = new ws.WeaponSwingRenderer(); console.log('cancelWindup:', typeof renderer.cancelWindup === 'function'); }); " ``` *Expected result*: Both output `true`.