# BRIEFING — 2026-10-04T09:33:00Z

## Mission
Implement FreeExile Character Stat Aggregator, SQLite Formula Persistence, and Server Engine Loop Integration with full test coverage and zero regressions.

## 🔒 My Identity
- Archetype: worker_core_1
- Roles: implementer, qa, specialist
- Working directory: c:\Projects\FreeExile\.agents\teamwork\worker_core_1
- Original parent: 0c96a21c-3538-4869-84a2-2591717ce252
- Milestone: M1-M4 (All Milestones)

## 🔒 Key Constraints
- Exclusive Write Boundaries:
  - server/stats/__init__.py
  - server/stats/stat_types.py (< 200 lines)
  - server/stats/formula_persistence.py (< 250 lines)
  - server/stats/stat_aggregator.py (< 350 lines)
  - server/world/server_engine_loop.py (MUST run `python tools/analysis/blast_radius.py --target server/world/server_engine_loop.py --ack` BEFORE editing!)
  - tests/unit/test_character_stat_aggregator.py (< 350 lines)
- Integrity Mandate: Genuine implementation, no hardcoded test shortcuts or dummy facades.
- Strict backward compatibility for ServerEngineLoop with legacy tests.
- All code must adhere to <= 350 soft cap / <= 500 hard cap and pass check_code_and_doc_hygiene.py --strict.

## Current Parent
- Conversation ID: 0c96a21c-3538-4869-84a2-2591717ce252
- Updated: 2026-10-04T09:33:00Z

## Task Summary
- **What to build**: Character Stat Aggregator system calculating and aggregating stats from base attributes, equipped item affixes (both Affix and AffixMod, 2H/DW grips), and Meridian passives under PoE math (Flat, Inc/Red, More/Less, tags, conditions), with AST formula persistence to SQLite (character_stat_calculations table in data/character_stat_formulas.db or :memory:), and ServerEngineLoop registration wiring.
- **Success criteria**: All unit tests pass (>= 10 test cases), existing engine/inventory/meridian tests pass, hygiene check passes cleanly.
- **Interface contracts**: c:\Projects\FreeExile\.agents\teamwork\orchestrator_21\PROJECT.md
- **Code layout**: c:\Projects\FreeExile\.agents\teamwork\orchestrator_21\PROJECT.md § Code Layout

## Key Decisions Made
- Use dataclass(slots=True, frozen=True) where possible for immutability and speed.
- Support both :memory: and on-disk SQLite paths in FormulaPersistenceService with WAL mode and normalized schema.
- Keep register_player signature 100% backward compatible with existing tests while injecting aggregated stats when available.
- Keep all files strictly under soft and hard caps, with methods <= 50 lines.

## Artifact Index
- .agents/teamwork/worker_core_1/BRIEFING.md — Persistent context & situational awareness
- .agents/teamwork/worker_core_1/progress.md — Heartbeat and step tracking
- .agents/teamwork/worker_core_1/handoff.md — 5-component handoff report
- server/stats/stat_types.py — Domain types and AST hierarchy (187 lines)
- server/stats/formula_persistence.py — SQLite persistence service (163 lines)
- server/stats/stat_aggregator.py — Core PoE math aggregator (329 lines)
- server/stats/__init__.py — Package exports (35 lines)
- server/world/server_engine_loop.py — Engine loop wiring (292 lines)
- tests/unit/test_character_stat_aggregator.py — Unit test suite with 12 tests (221 lines)

## Change Tracker
- **Files modified**:
  - `server/stats/stat_types.py`: Created domain types and AST hierarchy
  - `server/stats/formula_persistence.py`: Created SQLite persistence service
  - `server/stats/stat_aggregator.py`: Created PoE math aggregator
  - `server/stats/__init__.py`: Created package exports
  - `server/world/server_engine_loop.py`: Injected stat_aggregator and updated register_player
  - `tests/unit/test_character_stat_aggregator.py`: Created comprehensive 12-test suite
- **Build status**: 33/33 unit tests PASS (1.05s), 45/45 dependent tests PASS (1.56s)
- **Pending issues**: None

## Quality Status
- **Build/test result**: PASS (100% Green across all test suites)
- **Lint status**: PASS (Zero hygiene violations or warnings on modified files)
- **Tests added/modified**: 12 new comprehensive tests covering all requirements

## Loaded Skills
- None