# BRIEFING — 2026-10-02T05:28:00Z

## Mission
Survey ARPG PC input controls (Click-to-Move, RMB, QWER, 1-5, Spacebar Huyễn Ảnh Bộ, UI shortcuts I/C/Esc/Tab), controller integration with canvas_renderer, and the end-to-end testing/verification strategy for the PC Client (`client/web_pc/`).

## 🔒 My Identity
- Archetype: explorer
- Roles: survey_explorer_3, Investigator, Synthesizer
- Working directory: c:\Projects\FreeExile\.agents\teamwork\survey_explorer_3\
- Original parent: 7eb101bf-362e-46b0-81cc-0a9216617c39
- Milestone: PC Desktop Client Architecture & Controls Survey

## 🔒 Key Constraints
- Read-only investigation — do NOT implement
- Work strictly within .agents/teamwork/survey_explorer_3/
- Coordinate via send_message to parent (7eb101bf-362e-46b0-81cc-0a9216617c39)
- Strictly follow Handoff Protocol (Observation, Logic Chain, Caveats, Conclusion, Verification Method)

## Current Parent
- Conversation ID: 7eb101bf-362e-46b0-81cc-0a9216617c39
- Updated: 2026-10-02T05:28:00Z

## Investigation State
- **Explored paths**:
  - `client/webapp/index.html` (DOM structure, viewport, mobile frame, HUD, modals)
  - `client/webapp/js/main.js` (Keybindings, modal toggling, pause, tooltips)
  - `client/webapp/js/engine/canvas_renderer.js` (Movement loop, `player.destination`, Click-to-Move kinematics, `keys`)
  - `client/webapp/js/engine/joystick.js` (Virtual joystick, touch events, `window.keys` listener)
  - `client/webapp/js/engine/iso_math.js` (`worldToIso`, `isoToWorld`, `player` state, camera lerp, bounds)
  - `client/webapp/js/engine/combat_skills.js` (`doPrimaryAttack`, `doFire`, `doThunder`, `doFrost`, `doDodge`, canvas click listener)
  - `client/webapp/js/engine/monster_system.js` (`drinkHealthPotion`, `activeMonsters`, `getBestCombatTarget`, `spawnClickRipple`)
  - `client/webapp/js/engine/grid_pathfinder.js` (A* pathfinding, obstacle bitmasks)
  - `client/webapp/js/ui/skill_bar_controller.js` (Default slots, cooldown sweeps, key bindings, charges)
  - `tests/e2e/` (Playwright headless test architecture, quiet HTTP server)
  - `tools/lint/check_code_and_doc_hygiene.py` (Passed with zero hard cap violations)
- **Key findings**:
  - `canvas_renderer.js` ALREADY contains native Click-to-Move destination kinematics (`lines 84-95`). When `keys` are empty and `player.destination.active` is true, it computes directional vector, moves with `resolveMovementWithSliding()`, turns heading, and transitions to idle upon arrival.
  - In `canvas_renderer.js`, `W` was previously treated as move-up. In ARPG PC mode, `keys['w']` must NOT be set to true; `W` is routed to Martial Skill 2.
  - `isoToWorld(clickX, clickY)` in `iso_math.js` accurately transforms canvas screen space to isometric world coordinates taking camera offset into account.
  - `doDodge()` in `combat_skills.js` implements 0.25s i-frame, 1.75x speed boost, ghost trails, and attack cancellation.
  - `drinkHealthPotion()` in `monster_system.js` provides instant 450 HP recovery, chime SFX, and visual damage text.
  - Flask system (1-5) can be expanded to 5 slots: Health, Mana, Quicksilver (Speed), Granite (Defense), Diamond (Crit).
  - Clean controller design (`pc_input_controller.js`) replaces `joystick.js` on PC without modifying a single line in `client/webapp/`, guaranteeing zero mobile regression.
  - Testing strategy uses Playwright headless E2E (`tests/e2e/test_pc_desktop_client_e2e.py`) and Python unit tests (`tests/unit/test_pc_input_controller.py`).
- **Unexplored areas**: None for survey scope. All required components analyzed.

## Key Decisions Made
- Confirmed zero-modification requirement for `client/webapp/`: PC client at `client/web_pc/` loads shared engines via relative paths (`../webapp/js/...`) and substitutes `joystick.js` with `pc_input_controller.js`.
- Formulated complete 10-point test specification covering layout, input mechanics, cooldowns, modal toggles, i18n, and error-free execution.

## Artifact Index
- `c:\Projects\FreeExile\.agents\teamwork\survey_explorer_3\handoff.md` — Comprehensive survey & architectural handoff report
- `c:\Projects\FreeExile\.agents\teamwork\survey_explorer_3\progress.md` — Liveness heartbeat & milestone log
- `c:\Projects\FreeExile\.agents\teamwork\survey_explorer_3\BRIEFING.md` — Persistent agent memory