# BRIEFING — 2026-10-02T06:51:00Z

## Mission
Empirically stress-test PC Desktop Web Client controls and kinematics (Click-to-Move, Hold-to-Move dragging, W decoupling, Spacebar dodge roll, flask spam, chat focus guard) and deliver an empirical verdict.

## 🔒 My Identity
- Archetype: teamwork_preview_challenger
- Roles: critic, specialist
- Working directory: c:\Projects\FreeExile\.agents\teamwork\challenger_18_1\
- Original parent: 75463099-5538-440a-8ff9-91c183526f7a (orchestrator_18)
- Milestone: PC Desktop Web Client Controls & Kinematics Stress Testing
- Instance: 1 of 1

## 🔒 Key Constraints
- Review-only — do NOT modify implementation code (report findings/bugs, do not fix them yourself)
- Verification must be EMPIRICAL: write and run verification scripts, tests, generators, oracles
- No lip-service; substantiate everything with metrics and logs
- Write handoff.md in your working directory and notify parent via send_message

## Current Parent
- Conversation ID: 75463099-5538-440a-8ff9-91c183526f7a
- Updated: not yet

## Review Scope
- **Files to review**: `client/web_pc/js/controls/pc_input_controller.js`, `client/web_pc/js/engine/kinematics_engine.js`, `tests/unit/test_pc_input_controller.py`, `tests/e2e/test_pc_desktop_client_e2e.py`
- **Interface contracts**: `PROJECT.md`, `TEST_READY.md`, `ORIGINAL_REQUEST.md`
- **Review criteria**: Correctness, stress resilience, edge cases, attack interruption, i-frame timing, input decoupling, chat focus guard

## Attack Surface
- **Hypotheses tested**:
  1. Click-to-Move & Hold-to-Move coordinate stability under rapid bursts and extreme boundaries (Passed: 0 NaN, 0 Infinity).
  2. Standstill W key decoupling (Passed: 0.0 drift, WASD disabled, W mapped to skill).
  3. Spacebar dodge roll i-frame timing and attack interruption (Passed: attack canceled, 0.25s i-frame granted).
  4. Spacebar dodge charge accounting (Failed: double-decrement bug, 2 charges consumed per press).
  5. i-frame timer expiration in canvas_renderer.js (Failed: missing `#badge-iframe` in web_pc causes TypeError).
  6. Survival flask 1-5 rapid triggering and buff applications (Passed: buffs applied, cooldowns locked).
  7. Chat typing focus guard with Space and QWER12345 (Passed: hotkeys ignored while focused).
- **Vulnerabilities found**:
  - DEFECT-BADGE-IFRAME-NULL-CRASH (CRITICAL): `canvas_renderer.js:219` crashes with `TypeError: Cannot read properties of null (reading 'classList')` upon dodge expiration due to missing `#badge-iframe` in `client/web_pc/index.html`.
  - DEFECT-DODGE-DOUBLE-DECREMENT (HIGH): `pc_input_controller.js:195` and `combat_skills.js:304` both trigger cooldown, consuming 2 charges on a single Spacebar press (3 -> 1).
- **Untested angles**: Full multi-player network sync under desync conditions (out of scope for client input challenger).

## Loaded Skills
- None specified by parent.

## Key Decisions Made
- Executed existing test suite (`test_pc_input_controller.py`, `test_pc_desktop_client_e2e.py`): 9 passed.
- Implemented and executed empirical stress test harness (`empirical_stress_test.py`): 4 suites passed, 2 suites failed.
- Rendered empirical verdict: **REJECT** due to 1 CRITICAL runtime crash and 1 HIGH charge accounting bug.

## Artifact Index
- DISPATCH.md — Parent task instructions and specifications
- BRIEFING.md — Situational awareness and identity
- progress.md — Liveness heartbeat log
- empirical_stress_test.py — Full automated adversarial stress testing harness
- stress_test_results.json — Empirical JSON telemetry output from test execution
- test_targeted_findings.py — Isolated verification script for W drift, dodge double-decrement, and badge-iframe crash
- test_chat_guard.py — Isolated verification script for chat typing focus guard
- handoff.md — 5-Component adversarial challenge report and verdict