# BRIEFING — 2026-10-02T03:00:00Z

## Mission
Implement Milestone 3: Client Engine Texture Rendering Upgrade & Server 30-Biome Pipeline Integration for FreeExile.

## 🔒 My Identity
- Archetype: teamwork_preview_worker
- Roles: implementer, qa, specialist
- Working directory: c:\Projects\FreeExile\.agents\teamwork\worker_m3
- Original parent: 327366ba-dd05-4805-b53b-659a199b1450
- Milestone: Milestone 3: TileMapRenderer & Server 30-Biome Pipeline Integration

## 🔒 Key Constraints
- Exclusive write boundaries:
  - `client/webapp/js/engine/biome_texture_manager.js` (NEW, length <= 350 lines)
  - `client/webapp/js/engine/tile_map_renderer.js` (UPDATE, length <= 350 lines)
  - `client/webapp/js/engine/tile_grid_loader.js` (UPDATE, length <= 350 lines)
  - `client/webapp/index.html` (UPDATE, length <= 400 lines hard cap)
  - `server/world/map_biome_catalog.py` (UPDATE, length <= 700 lines)
  - `server/world/map_binary_serializer.py` (UPDATE)
  - `server/world/wilderness_map_generator.py` (UPDATE)
  - `tools/serve_webapp.py` (UPDATE)
  - `tests/unit/test_war_fog_and_procedural_map.py` (UPDATE line 50 assertion)
  - `.agents/teamwork/worker_m3/*`
- Texture RAM < 500 KB (active biome cache with eviction of older biomes). Node.js safe.
- OffscreenCanvas chunk cache (8 slots <= 16.5 MB RAM) and 4-plane SAT Diamond culling must remain 100% operational.
- Native Lifecycle Hook Blast Radius Gate: Pre-tool checks and acknowledgment via `python tools/analysis/blast_radius.py --target <path> --ack`.
- Zero lip-service, genuine implementations, no hardcoded cheating.
- Verification required: pytest unit & e2e, Node stress tests, hygiene audit.

## Current Parent
- Conversation ID: 327366ba-dd05-4805-b53b-659a199b1450
- Updated: 2026-10-02T03:00:00Z

## Task Summary
- **What to build**: Texture rendering pipeline with lazy loading of 30 Dark Fantasy biomes, LRU cache eviction (< 500 KB texture RAM), procedural pattern fallback, 2.5D elevation extrusion, deterministic decal distribution, 30-biome server pipeline serialization, `/api/map` query support, simulator UI dropdown selector.
- **Success criteria**: All 333 map/biome tests pass, Node.js LRU/tile grid/texture manager tests pass, zero hard cap hygiene violations.
- **Interface contracts**: PROJECT.md, task.md, map_style_catalog.js
- **Code layout**: client/webapp/js/engine/, server/world/, tools/, tests/unit/

## Key Decisions Made
- Built `BiomeTextureManager` with single-active-biome memory budget (< 500 KB RAM) and eviction of inactive biomes, deterministic pattern caching, and safe headless mock support in Node.js.
- Upgraded `TileMapRenderer` with `BiomeTextureManager` integration while keeping full 4-plane SAT Diamond Frustum culling and 8-slot LRU OffscreenCanvas cache (16.01 MB RAM <= 16.5 MB budget, > 100,000 FPS stationary/pan performance).
- Maintained 2.5D extrusion for elevated structures (Walls, Barricades, Altars) and deterministic coordinate-hashed prop decals on walkable tiles (Floor, Path) with probability < 0.15.
- Expanded server binary serializer (`map_binary_serializer.py`) to map 1..30 biomes bidirectionally with canonical Vietnamese names, legacy names, and integer string keys.
- Added `#debug-biome-selector` to `#simulator-bar` in `index.html` with in-place reactive map reloads and URL parameter synchronization, keeping HTML under 243 lines (cap 400).

## Change Tracker
- **Files modified**:
  - `client/webapp/js/engine/biome_texture_manager.js`: NEW, 257 lines (cap <= 350)
  - `client/webapp/js/engine/tile_map_renderer.js`: UPDATED, 291 lines (cap <= 350)
  - `client/webapp/js/engine/tile_grid_loader.js`: UPDATED, 233 lines (cap <= 350)
  - `client/webapp/index.html`: UPDATED, 243 lines (cap <= 400)
  - `server/world/map_biome_catalog.py`: UPDATED, 463 lines (cap <= 700)
  - `server/world/map_binary_serializer.py`: UPDATED
  - `server/world/wilderness_map_generator.py`: UPDATED
  - `tools/serve_webapp.py`: UPDATED
  - `tests/unit/test_war_fog_and_procedural_map.py`: UPDATED
- **Build status**: Pass (100% green).
- **Pending issues**: None.

## Quality Status
- **Build/test result**: 333/333 pytest suite passed (31.15s), 8/8 test_biome_texture_manager tests passed, 4/4 test_challenger_lru_thrashing_stress suites passed (0 leaks, 16.01 MB RAM), 48/48 test_challenger_tile_grid_stress passed.
- **Lint status**: 0 hard cap violations across all modified files; 100% i18n hygiene compliance.
- **Tests added/modified**: `test_war_fog_and_procedural_map.py` line 50 assertion updated from 5 to 30 biomes; Node test suites validated.

## Loaded Skills
- None required directly.

## Artifact Index
- task.md — Task assignment from orchestrator
- BRIEFING.md — Persistent context & situational awareness
- progress.md — Liveness & heartbeat
- handoff.md — 5-component handoff report