# BRIEFING — 2026-10-02T07:10:15Z

## Mission
Investigate root causes and formulate exact remediation diffs/instructions for #badge-iframe DOM missing error and sfxEngine.playWeaponSlash runtime exception in Web PC client without touching client/webapp/.

## 🔒 My Identity
- Archetype: teamwork_preview_explorer
- Roles: DOM & Runtime Exception Remediation Explorer
- Working directory: c:\Projects\FreeExile\.agents\teamwork\explorer_18_2\
- Original parent: 75463099-5538-440a-8ff9-91c183526f7a
- Milestone: Milestone 18 - Web PC Client Polish & Verification

## 🔒 Key Constraints
- Read-only investigation — do NOT implement code changes directly in project source
- client/webapp/ must remain 100% untouched to prevent mobile webapp regressions
- Exact code diffs and step-by-step instructions must be provided in handoff.md for worker_18_2
- Must report back to parent (orchestrator_18) via send_message

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

## Investigation State
- **Explored paths**:
  - `client/web_pc/index.html` (DOM tree, `#hud-char-status-card`, missing `#badge-iframe`)
  - `client/webapp/index.html` (reference `#badge-iframe` definition at line 85)
  - `client/webapp/js/engine/canvas_renderer.js:217-222` (uncaught TypeError at line 219)
  - `client/webapp/js/engine/combat_skills.js:295-325` (line 301 optional chaining, line 309 call to `sfxEngine.playWeaponSlash()`)
  - `client/webapp/js/audio/sfx_engine.js:195, 400-440` (`SFXEngine.playBladeSlash`, export of `sfxEngine`, lack of `playWeaponSlash`)
  - `client/web_pc/js/pc_main.js` (orchestration, modular structure, audio unlock)
  - `client/web_pc/js/pc_input_controller.js:186-216` (Space dodge and RMB/KeyR primary attack trigger; double cooldown on dodge)
  - Audit/Challenge reports: `auditor_18_1`, `challenger_18_1`, `challenger_18_2`, `reviewer_18_2`
- **Key findings**:
  1. `canvas_renderer.js:219` attempts `document.getElementById('badge-iframe').classList.add('hidden')` without `?.`. Because `client/web_pc/index.html` lacked `#badge-iframe`, any dodge roll threw `TypeError: Cannot read properties of null (reading 'classList')` upon 0.25s expiration. Empirically confirmed via `test_targeted_findings.py`.
  2. `combat_skills.js:309` invokes `sfxEngine.playWeaponSlash()`. `sfx_engine.js` defines `playBladeSlash()`. Because `window.sfxEngine` is truthy, the call throws `TypeError: sfxEngine.playWeaponSlash is not a function`. Empirically confirmed via `test_do_primary.py`.
  3. `pc_input_controller.js:195` calls `this.triggerUiCooldown('dodge', 3.0)` after `doDodge()`, which already triggers the cooldown in `combat_skills.js:304`, causing a double decrement of dodge charges (3 -> 1 on single press).
- **Unexplored areas**: None for the core investigation scope.

## Key Decisions Made
1. Place `<div id="badge-iframe" class="hidden px-1.5 py-0.2 rounded bg-amber-500/20 text-amber-300 border border-amber-400/40 font-mono text-[8px] animate-pulse">I-FRAME</div>` inside `#hud-char-status-card` next to `#txt-char-level`.
2. Implement multi-tier audio aliasing in `client/web_pc/js/pc_main.js`: import `sfxEngine, SFXEngine` and alias `playWeaponSlash = function(...args) { return this.playBladeSlash(...args); }` on `SFXEngine.prototype`, `sfxEngine`, and inside `PcMain.initAudioAliasing()` for `window.sfxEngine`. Zero edits in `client/webapp/`.
3. Include actionable recommendation for `pc_input_controller.js:195` to fix dodge charge double decrement.

## Artifact Index
- c:\Projects\FreeExile\.agents\teamwork\explorer_18_2\DISPATCH.md — Incoming task assignments and instructions
- c:\Projects\FreeExile\.agents\teamwork\explorer_18_2\BRIEFING.md — Persistent working memory and state
- c:\Projects\FreeExile\.agents\teamwork\explorer_18_2\progress.md — Liveness heartbeat and progress tracking
- c:\Projects\FreeExile\.agents\teamwork\explorer_18_2\handoff.md — 5-component handoff report for worker_18_2