# BRIEFING — 2026-10-01T20:06:00Z

## Mission
Investigate and design performance benchmark tooling (`tools/perf/map_render_benchmark.js`) and test verification spec for M2:
1. Design `tools/perf/map_render_benchmark.js` to benchmark `TileMapRenderer` (fps >= 30, draw calls <= 4-6 chunk blits, RAM <= 8 MB).
2. Formulate verification criteria for non-regression of Waypoints (safe radius ring, pulse animation), Map Device (6 portals, activation rune), and props in `world_renderer.js`.
3. Verify test commands: `pytest tests/unit/`, `pytest tests/e2e/test_poe2_map_system_e2e.py`, `python tools/lint/check_code_and_doc_hygiene.py --strict`.

## 🔒 My Identity
- Archetype: explorer
- Roles: Read-only investigation, analyze problems, synthesize findings, produce structured reports
- Working directory: c:\Projects\FreeExile\.agents\teamwork\explorer_m2_3
- Original parent: bc45a740-aa86-45b5-8706-381960281bc6
- Milestone: Milestone 2: Map Portal Traversal & Client Test Verification
- Roles: Performance Benchmark & Test Spec Explorer
- Current parent: 1cc48fc5-ce57-4f48-8964-24cab4bfcacc
- Milestone: Milestone M2: Mobile-Optimized Tile Rendering Benchmark & Test Verification

## 🔒 Key Constraints
- Read-only investigation — do NOT implement
- Do NOT directly modify source code (except writing reports and analysis files in your own folder)
- Follow Handoff Protocol (5-Component Handoff Report: Observation, Logic Chain, Caveats, Conclusion, Verification Method)
- Use send_message to communicate results back to caller (parent id: bc45a740-aa86-45b5-8706-381960281bc6)
- Current caller / parent id: 1cc48fc5-ce57-4f48-8964-24cab4bfcacc
- Never place source code or data in `.agents/teamwork/`
- Respect line length caps: Code <= 350 soft / <= 500 hard, Docs <= 400 soft / <= 600 hard

## Current Parent
- Conversation ID: 1cc48fc5-ce57-4f48-8964-24cab4bfcacc
- Updated: 2026-10-01T20:06:00Z

## Investigation State
- **Explored paths**:
  - `client/webapp/js/engine/world_renderer.js` (lines 1-461)
  - `client/webapp/js/engine/canvas_renderer.js` (lines 280-325)
  - `client/webapp/js/engine/tile_grid_loader.js` (lines 1-153)
  - `client/webapp/js/engine/iso_math.js`
  - `tests/e2e/test_poe2_map_system_e2e.py` (81 tests, 100% passing)
  - `tools/lint/check_code_and_doc_hygiene.py`
  - `.agents/teamwork/orchestrator_11/PROJECT.md`
  - `.agents/teamwork/ORIGINAL_REQUEST.md` (R2: Mobile-Optimized Tile Rendering)
  - `.agents/teamwork/explorer_m2_1/DISPATCH.md` & `progress.md`
  - `.agents/teamwork/explorer_m2_2/DISPATCH.md`
- **Key findings**:
  1. `test_poe2_map_system_e2e.py` has 81 tests covering M1 (generation, serialization, sinuous path, encounter zones, dead ends, boss gate, POIs, safe spawn floor). All 81 pass in 0.98s.
  2. `world_renderer.js` currently has hardcoded math in lines 12-28 (`Math.abs(x-y) <= 1` stone, `Math.hypot(x-5, y-(-3)) < 3.2` water) which should be replaced by `TileMapRenderer.render(ctx, camera, viewport)`.
  3. `world_renderer.js` lines 188-379 render Map Device (6 portals in hexagonal formation orbiting altar, runic stone dais, central conduit glow, sigil `⚡`) and Waygates. Lines 380-458 render Wilderness Return Waypoint (pulsating safe zone dashed ellipse $rx \approx 362, ry \approx 181$, obelisk stone pillar, sigil `🏛️`). These MUST remain intact and non-regressed!
  4. Props (`mapProps`) are rendered in `canvas_renderer.js` (line 233) and depth-sorted in `entity_renderer.js` (line 54), not inside the tile loop.
  5. `TileGridLoader` (in `tile_grid_loader.js`) works in both browser and Node.js (`globalThis`), exposing `getTileAt`, `setTileAt`, `currentMapGrid`, `currentMapWidth`, `currentMapHeight`.
- **Unexplored areas**:
  - Exact Node.js mock/headless implementation for `map_render_benchmark.js`.
  - Full execution of `pytest tests/unit/` and `check_code_and_doc_hygiene.py --strict`.

## Key Decisions Made
- Design `map_render_benchmark.js` to run in Node.js with zero external dependencies (pure mock canvas 2D context tracking draw calls, blits, canvas allocations, and high-resolution timing via `performance.now()`), with optional browser support.
- Specify exact regression test matrix for Waypoints, Map Device, and props.
- Prepare standalone artifact `c:\Projects\FreeExile\.agents\teamwork\explorer_m2_3\proposed_map_render_benchmark.js` for Worker M2.

## Artifact Index
- `c:\Projects\FreeExile\.agents\teamwork\explorer_m2_3\BRIEFING.md` — Persistent agent memory
- `c:\Projects\FreeExile\.agents\teamwork\explorer_m2_3\DISPATCH.md` — Inbound instructions log
- `c:\Projects\FreeExile\.agents\teamwork\explorer_m2_3\progress.md` — Liveness heartbeat
- `c:\Projects\FreeExile\.agents\teamwork\explorer_m2_3\report.md` — In-depth investigation report
- `c:\Projects\FreeExile\.agents\teamwork\explorer_m2_3\handoff.md` — Final 5-component handoff report