# BRIEFING — 2026-10-02T07:35:45Z

## Mission
Adversarially challenge runtime stability, console cleanliness, primary attack audio execution with sfxEngine.playWeaponSlash, 10 key/mouse action triggers without errors, multi-res display scaling, and server path traversal rejection (confirming 404 on all exploit vectors).

## 🔒 My Identity
- Archetype: teamwork_preview_challenger
- Roles: critic, specialist
- Working directory: c:\Projects\FreeExile\.agents\teamwork\challenger_18_4\
- Original parent: 75463099-5538-440a-8ff9-91c183526f7a
- Milestone: milestone_18_rechallenge
- Instance: 4 of 4

## 🔒 Key Constraints
- Review-only — do NOT modify implementation code
- Run tests and verification code empirically; do not trust worker claims
- Write report to c:\Projects\FreeExile\.agents\teamwork\challenger_18_4\handoff.md
- Render clear verdict (APPROVE or REJECT)

## Current Parent
- Conversation ID: 75463099-5538-440a-8ff9-91c183526f7a
- Updated: 2026-10-02T07:31:39Z

## Review Scope
- **Files to review**: `client/web_pc/`, `tools/serve_web_pc.py`, `tests/e2e/test_pc_desktop_client_e2e.py`
- **Interface contracts**: `PROJECT.md`, `worker_iter4/handoff.md`, `challenger_18_2/handoff.md`
- **Review criteria**: correctness, runtime stability, error cleanliness, audio invocation, multi-res scaling, traversal rejection

## Key Decisions Made
- Created independent empirical test harness `empirical_resilience_test.py`.
- Verified server path traversal rejection across 11 exploit vectors: 100% returned HTTP 404.
- Verified multi-resolution display scaling across 11 resolutions (16:9, 16:10, 21:9, 32:9, 4:3): 0 horizontal & 0 vertical scrollbars.
- Verified primary attack audio execution: `sfxEngine.playWeaponSlash` executes `playBladeSlash` with 0 TypeErrors.
- Verified 10 sequential key/mouse action triggers + RMB attack + dodge roll expiration: 0 page errors, 0 console errors.

## Artifact Index
- DISPATCH.md — Received task instructions
- BRIEFING.md — Persistent context & identity
- progress.md — Real-time progress and liveness heartbeat
- empirical_resilience_test.py — Dedicated challenger testing harness
- handoff.md — Final hard handoff report with empirical metrics and verdict

## Attack Surface
- **Hypotheses tested**:
  - H1: Server path traversal via `..`, `%2e%2e`, and `:` tokens returns 200 or 500 (Refuted: All return strict 404).
  - H2: Invoking `doPrimaryAttack()` throws `TypeError: sfxEngine.playWeaponSlash is not a function` (Refuted: Audio aliasing in `pc_main.js` correctly forwards to `playBladeSlash`).
  - H3: Spacebar dodge roll throws `TypeError: Cannot read properties of null (reading 'classList')` upon i-frame expiration (Refuted: `#badge-iframe` is present in DOM, 0 errors).
  - H4: Executing 10 key/mouse action triggers produces uncaught exceptions (Refuted: 0 page errors, 0 console errors).
  - H5: Ultrawide (21:9) and Super Ultrawide (32:9) cause horizontal/vertical overflow (Refuted: 0 scrollbars across all 11 aspect ratios).
- **Vulnerabilities found**: None. All prior defects have been empirically verified as eliminated.
- **Untested angles**: Full multiplayer WebSocket synchronization over remote WAN (out of scope for local desktop client).

## Loaded Skills
- None specified in dispatch