# BRIEFING — 2026-10-01T03:05:00Z

## Mission
Empirically stress-test and challenge Milestone 2 (Character Animation & Visceral Combat Feel Engine) to find failure modes, verify kinetic state transitions, hit-stop pauses, DamageNumberPool ring buffer allocations, and test suites, delivering an unambiguous verdict.

## 🔒 My Identity
- Archetype: challenger (Empirical Challenger)
- Roles: critic, specialist
- Working directory: c:\Projects\FreeExile\.agents\teamwork\challenger_m2_1_gen3
- Original parent: 77cd448f-be37-473e-809c-59db9f78e386
- Milestone: Milestone 2 (Character Animation & Visceral Combat Feel Engine)
- Instance: 1 of 1

## 🔒 Key Constraints
- Review-only — do NOT modify implementation code directly; write verification tests and reproduction scripts to challenge assumptions.
- Empirical verification mandatory — bugs must be reproduced by executing code/tests.
- Deliver unambiguous verdict: APPROVE or REQUEST_CHANGES.
- Output handoff report in 5-component format to `c:\Projects\FreeExile\.agents\teamwork\challenger_m2_1_gen3\handoff.md`.

## Current Parent
- Conversation ID: 77cd448f-be37-473e-809c-59db9f78e386
- Updated: 2026-10-01T03:05:00Z

## Review Scope
- **Files to review**:
  - `client/webapp/js/engine/animation_engine.js`
  - `client/webapp/js/engine/combat_feel_engine.js`
  - `client/webapp/js/data/weapon_swing_catalog.js`
  - `client/webapp/js/engine/combat_skills.js`
  - `client/webapp/js/engine/canvas_renderer.js`
  - `tests/unit/test_m2_animation_and_combat_feel.py`
  - `tests/e2e/test_poe2_ui_animation_vfx_e2e.py`
  - Worker handoff: `c:\Projects\FreeExile\.agents\teamwork\worker_m2_1_gen3\handoff.md`

## Attack Surface
- **Hypotheses tested**:
  1. Kinetic state machine phase progression across frame rates (15-240 FPS) and action speeds (0.5-2.0x).
  2. Frame-accurate synchronization between `frameIndex` and `kineticPhase`.
  3. Action cancellation persistence in `AnimationEngine.cancelAction`.
  4. Hit-stop timer decay in `CombatFeelEngine.update(dt)`.
  5. Directional screen shake camera linkage via `CombatFeelEngine.getShakeOffset`.
  6. DamageNumberPool ring buffer capacity (256+ spawns), zero dynamic allocations, pop-in curve.
- **Vulnerabilities found**:
  1. **CRITICAL/HIGH**: `CombatFeelEngine.prototype.getShakeOffset` is missing. Directional screen shake matrix is dead code in `canvas_renderer.js`.
  2. **HIGH**: Premature `kineticPhase` computation before frame advancement causes 1-tick phase lag at 60 FPS and skips `recovery` phase entirely at 15 FPS / high attack speed.
  3. **MEDIUM**: `cancelAction` leaves `currentClip` as attack clip, causing next `updateAnimation` tick to revert `kineticPhase` to `wind_up`.
  4. **MEDIUM**: `CombatFeelEngine.hitStopTimer` is not decremented in `CombatFeelEngine.prototype.update(dt)`.
  5. **LOW**: `animation_engine.js` lacks `!isNaN(dt)` guard on `actualDt`.
- **Untested angles**:
  - WebGL shader bindings for 120 FPS Metal (scoped for M3/M5).

## Loaded Skills
- Source: None explicitly provided in dispatch
- Local copy: N/A
- Core methodology: Empirical verification, adversarial stress testing, property testing, and boundary analysis.

## Key Decisions Made
- Verdict: **REQUEST_CHANGES** due to 2 High-severity defects and 2 Medium-severity defects confirmed by executable reproduction tests in `tests/unit/test_challenger_m2_adversarial.py`.

## Artifact Index
- `DISPATCH.md` — Inbound dispatch message
- `BRIEFING.md` — Persistent situational awareness and identity
- `progress.md` — Liveness heartbeat and milestone tracking
- `handoff.md` — Comprehensive 5-component challenge report and verdict
- `tests/unit/test_challenger_m2_adversarial.py` — Automated empirical reproduction suite