# BRIEFING — 2026-10-01T00:56:15Z

## Mission
Analyze code changes needed in game_design_matrix_seeder.py for Milestone 1 (Piecewise EXP Curve & Seeder Upgrade), verify mathematical bounds, and prepare implementation guide for Worker M1.

## 🔒 My Identity
- Archetype: explorer
- Roles: investigation, synthesis
- Working directory: c:\Projects\FreeExile\.agents\teamwork\explorer_m1_progression_1
- Original parent: 6f4a2aa2-4315-4660-8cb7-8352a7220c95
- Milestone: Milestone 1 (Piecewise EXP Curve & Seeder Upgrade)

## 🔒 Key Constraints
- Read-only investigation — do NOT implement / do NOT modify source code
- Exact 7-segment piecewise exponential formula specification
- Verify Lv 1-20 cumulative EXP < 0.1% of Lv 1-100 total
- Verify Lv 99->100 Delta >= 30% of Lv 1-99 cumulative EXP

## Current Parent
- Conversation ID: 6f4a2aa2-4315-4660-8cb7-8352a7220c95
- Updated: not yet

## Investigation State
- **Explored paths**:
  - `server/world/game_design_matrix_seeder.py` (lines 241-256)
  - `server/world/game_design_matrix_schema.py` (lines 132-140)
  - `server/world/game_design_matrix_service.py` (lines 160-185, 240-248)
  - `server/world/game_design_matrix_types.py`
  - `data/game_design_matrix.db` (progression_benchmarks table inspection)
  - `tools/lint/verify_game_design_matrix.py`
  - `tests/unit/test_game_design_matrix.py`
- **Key findings**:
  - Existing `500 * (lvl ** 1.85)` produces only 2.5M EXP at Lv 100 with negligible 46k delta at 99->100 (1.84%).
  - 7-segment piecewise formula mathematically validated:
    - Lifetime EXP: 23,925,692,466 (~23.93B)
    - Cumulative Lv 1-20: 2,755,579 (0.0115% of total, << 0.1%)
    - Cumulative Lv 1-99: 17,989,242,456
    - Delta Lv 99->100: 5,936,450,010 (33.00% of cumulative 1-99, 24.81% of lifetime)
    - Strict monotonicity: 100% across all 99 transitions and 100 cumulative levels.
  - Recommended extracting mathematical curve logic into dedicated module `server/world/level_progression_curve.py` to prevent `game_design_matrix_seeder.py` from exceeding the 350-line soft cap.
  - Identified requirement to adjust `prev_xp = -1` in `game_design_matrix_service.py` and `CHECK (target_exp >= 0)` to allow Level 1 starting baseline of 0 EXP.
- **Unexplored areas**: None for Milestone 1.

## Key Decisions Made
- Validated all 7 piecewise segments and boundary transitions.
- Formulated concrete implementation plan and code snippets for Worker M1 in `report.md` and `handoff.md`.

## Artifact Index
- DISPATCH.md — Task dispatch record
- BRIEFING.md — Persistent context & identity
- progress.md — Liveness heartbeat
- report.md — Complete investigation & implementation guide
- handoff.md — 5-component handoff report