# BRIEFING — 2026-10-02T06:16:00Z

## Mission
Analyze runtime .iphone-frame injection by iso_math.js and provide exact, verified fix recommendations for client/web_pc.

## 🔒 My Identity
- Archetype: explorer
- Roles: investigator, synthesizer
- Working directory: c:\Projects\FreeExile\.agents\teamwork\explorer_iter2_3\
- Original parent: 7eb101bf-362e-46b0-81cc-0a9216617c39
- Milestone: iter2_3

## 🔒 Key Constraints
- Read-only investigation — do NOT implement
- Analyze previous iteration failure reports from reviewer_1 and reviewer_2
- Recommend fix strategy for runtime injection of .iphone-frame into #app-viewport by iso_math.js
- Satisfy acceptance criteria ("0 mobile simulator elements in PC client") without touching client/webapp/

## Current Parent
- Conversation ID: 7eb101bf-362e-46b0-81cc-0a9216617c39
- Updated: 2026-10-02T06:08:36Z

## Investigation State
- **Explored paths**:
  - `client/webapp/js/engine/iso_math.js` (lines 1-110, setSimulatorMode & initial load)
  - `client/webapp/js/engine/canvas_renderer.js` (lines 35-55, keys lookup)
  - `client/webapp/js/ui/hud_orbs.js` (lines 1-40, 300-335, export HudOrbs)
  - `client/webapp/js/ui/minimap_hud.js` (lines 240-268, export default minimapInstance)
  - `client/web_pc/index.html` (head & script loading architecture)
  - `client/web_pc/js/pc_main.js` (initialization and modal bindings)
  - `client/web_pc/js/pc_hud_controller.js` (module imports and runtime calls)
  - `tests/e2e/test_pc_desktop_client_e2e.py` (open_pc_page init_script analysis)
  - `.agents/teamwork/reviewer_1/handoff.md` and `.agents/teamwork/reviewer_2/handoff.md`
- **Key findings**:
  1. `iso_math.js:91-92` reads `localStorage.getItem('fe_sim_mode') || 'iphone'`, defaulting to `'iphone'` on unseeded sessions and mutating `#app-viewport.className` to `"iphone-frame ..."`.
  2. Test helper `open_pc_page` in `test_pc_desktop_client_e2e.py:60` masked this bug by injecting `add_init_script` into Playwright instead of fixing `index.html`.
  3. `canvas_renderer.js:43` evaluates undeclared bare identifier `keys`, throwing `ReferenceError` unless `var keys` is declared at top-level script scope.
  4. `pc_hud_controller.js:6-8` fails V8 module linking with `SyntaxError` due to importing `{ hudOrbs, minimapHud }` instead of named `HudOrbs` and default `minimapHud`.
  5. Empirical test in headless Edge confirmed: Preamble + post-iso_math guard + import fix achieves 0 console errors and 0 .iphone-frame elements without touching `client/webapp/`.
- **Unexplored areas**: None. Root causes and defense-in-depth mitigations fully verified.

## Key Decisions Made
- Architecture recommendations structured into 3 defense-in-depth layers for layout protection, 1 preamble for `keys` declaration, and 1 module import repair.
- Zero modifications to `client/webapp/` ensures 100% mobile webapp regression safety.

## Artifact Index
- c:\Projects\FreeExile\.agents\teamwork\explorer_iter2_3\BRIEFING.md — Persistent working memory
- c:\Projects\FreeExile\.agents\teamwork\explorer_iter2_3\progress.md — Liveness heartbeat
- c:\Projects\FreeExile\.agents\teamwork\explorer_iter2_3\handoff.md — 5-component handoff report