# Sprint 259 Execution Tracker - 2026-02-26

## Scope
- `sprint259_plan.md`

## Implemented

Pipeline adaptive retry in `tools/mcp/run_sprint_taskitem_pipeline.sh`:
- Added:
  - `WSTONE_NATIVE_RAW_TOP_GAP_ADAPTIVE_RETRY`
  - `WSTONE_NATIVE_RAW_TOP_GAP_RETRY_SIGNALS`
- Retry trigger condition:
  - weighted top-gap mode enabled
  - `best_top_gap_score <= baseline_top_gap_score`
- Retry behavior:
  - synthesize expanded top-gap requirements
  - rerun raw task generation
  - score retry candidate
  - apply retry output only if it improves fail count, top-gap score, or task count tie-break
- Added summary packet:
  - `native_raw_adaptive_retry`

## Validation Artifacts

Adaptive retry OFF:
- `logs/taskitem_runs/01a_fallback_intake_spec_20260226_163143/00_summary.json`

Adaptive retry ON:
- `logs/taskitem_runs/01a_fallback_intake_spec_20260226_163148/00_summary.json`
- retry artifacts:
  - `logs/taskitem_runs/01a_fallback_intake_spec_20260226_163148/02af_raw_adaptive_retry.json`
  - `logs/taskitem_runs/01a_fallback_intake_spec_20260226_163148/02af_raw_adaptive_retry_score.json`
  - `logs/taskitem_runs/01a_fallback_intake_spec_20260226_163148/02af_raw_adaptive_retry_requirements_report.json`

Observed result on hard sample:
- retry attempted successfully
- `retry_top_gap_score=0`
- `retry_fail=1`
- `applied=false` (no uplift to apply)

## Explicit Completion Signal

- Sprint 259: `DONE` (implemented + validated; no uplift on this sample)