# BRIEFING — 2026-10-02T05:48:00Z

## Mission
Fast survey and synthesis of shared engine modules, asset paths, script tags, and zero-regression boundaries between `client/webapp/` and `client/web_pc/`.

## 🔒 My Identity
- Archetype: explorer
- Roles: investigation, synthesis
- Working directory: c:\Projects\FreeExile\.agents\teamwork\survey_explorer_1_rep
- Original parent: 7eb101bf-362e-46b0-81cc-0a9216617c39
- Milestone: PC Web Client Architecture Survey

## 🔒 Key Constraints
- Read-only investigation — do NOT implement
- Zero regression to client/webapp/
- Focus specifically on asset loading paths, module script tags, and singletons/globals for client/web_pc/

## Current Parent
- Conversation ID: 7eb101bf-362e-46b0-81cc-0a9216617c39
- Updated: 2026-10-02T05:40:32Z

## Investigation State
- **Explored paths**: `client/webapp/index.html`, `client/webapp/js/data/i18n.js`, `client/webapp/js/data/chat_i18n_catalog.js`, `client/webapp/js/engine/animation_engine.js`, `client/webapp/js/engine/biome_texture_manager.js`, `client/webapp/js/engine/iso_math.js`, `client/webapp/js/engine/canvas_renderer.js`, `client/webapp/js/engine/combat_skills.js`, `client/webapp/js/engine/monster_system.js`, `client/webapp/js/audio/sfx_engine.js`, `client/webapp/js/ui/skill_bar_controller.js`, `client/webapp/js/ui/template_manager.js`, `tools/serve_webapp.py`, `tests/unit/test_mobile_webapp_config.py`.
- **Key findings**:
  1. Asset loading paths in `i18n.js`, `animation_engine.js`, and `biome_texture_manager.js` use document-relative paths (`./assets/...` and `assets/...`). Using `<base href="../webapp/">` inside `client/web_pc/index.html` seamlessly maps all 105+ sprite atlases, monsters, characters, weapons, banners, and biome textures to `client/webapp/assets/` without copying files or modifying any code in `client/webapp/`.
  2. Procedural audio in `sfx_engine.js` is 100% Web Audio API procedural synthesis with zero external audio files. Sound works with 0 asset path dependencies.
  3. `canvas_renderer.js` lines 67 & 69 access `joystickStick.style.transform` directly without a null guard when WASD keys are pressed. `client/web_pc/index.html` must include a hidden dummy element `#joystick-stick` (and `#joystick-zone`, `#joystick-base`, `#joy-key-*`) to prevent null-dereference crashes on WASD.
  4. Core singletons (`window.player`, `window.camera`, `window.FreeExileI18n`, `window.skillBarController`, `window.TileMapRenderer`, `window.TileGridLoader`, `window.sfxEngine`) are exposed on `window` and fully reusable by PC HUD and PC input controllers.
- **Unexplored areas**: None for survey scope. Ready for handoff synthesis.

## Key Decisions Made
- Confirmed `<base href="../webapp/">` is the optimal, zero-regression architectural solution for `client/web_pc/index.html`.
- Identified mandatory dummy elements in PC HTML to prevent crashes from legacy mobile references in `canvas_renderer.js`.

## Artifact Index
- `c:\Projects\FreeExile\.agents\teamwork\survey_explorer_1_rep\handoff.md` — Complete 5-component analysis and handoff report.