# Sprint 254 Execution Tracker - 2026-02-26

## Scope
- `sprint254_plan.md`

## Implemented

New tool:
- `tools/mcp/synthesize_raw_gap_backlog.py`
  - Aggregates closure ladder run artifacts into prioritized raw-gap signals.
  - Mines `raw_only` attempt coverage checks where available.

Batch runner integration:
- `tools/mcp/run_native_profile_closure_ladder_batch.sh`
  - now emits:
    - `raw_gap_backlog.json`
    - `raw_gap_backlog.md`

## Validation Artifact

- `logs/taskitem_runs/TEST_ONLY_sprint254_closure_ladder_batch_20260226_r2/raw_gap_backlog.json`

Observed top missing signals (sample batch):
- `missing_prerequisite_op:whetstone_validate_taskitem`
- `missing_execution_contract:deterministic`
- `missing_prerequisite_op:whetstone_queue_ready`
- `missing_execution_contract:rollbackRequired`
- `missing_execution_contract:replayValidationRequired`

## Explicit Completion Signal

- Sprint 254: `DONE` (implemented + prioritized raw-gap backlog verified)