# Sprint 246 Execution Tracker - 2026-02-26

## Scope
- `sprint246_plan.md`

## Implemented

Pipeline updates in `tools/mcp/run_sprint_taskitem_pipeline.sh`:
- Added multishot controls:
  - `WSTONE_NATIVE_MULTISHOT_DECOMP` (default `0`)
  - `WSTONE_NATIVE_MULTISHOT_MAX_PROFILES` (default `12`)
  - `WSTONE_NATIVE_MULTISHOT_APPLY_MODE` (default `if_improves`)
- Added multishot generator pass behavior:
  - runs additional `whetstone_generate_taskitems` calls per active profile requirement
  - emits per-shot artifacts:
    - `02ac_generate_taskitems_multishot_<i>_raw.ndjson.json`
    - `02ac_generate_taskitems_multishot_<i>.json`
  - merges multishot task outputs into effective task set when improved
- Added summary telemetry:
  - `native_multishot`
  - `taskitems.effective_task_count`

## Validation Artifacts

A/B (autofill disabled, intrinsic boost enabled):
- multishot OFF:
  - `logs/taskitem_runs/TEST_ONLY_sprint246_multishot_20260226_152956/00_summary.json`
- multishot ON:
  - `logs/taskitem_runs/TEST_ONLY_sprint246_multishot_20260226_153033/00_summary.json`

Observed delta:
- `native_impact_coverage.failing_profile_count: 7 -> 0`
- `taskitems.effective_task_count: 2 -> 16`

Enforced gate behavior:
- pass with multishot ON:
  - `logs/taskitem_runs/TEST_ONLY_sprint246_multishot_enforce_20260226_153045/00_summary.json`
- fail with multishot OFF:
  - `logs/taskitem_runs/TEST_ONLY_sprint246_multishot_enforce_20260226_153047/06_native_impact_coverage.json`

## Explicit Completion Signal

- Sprint 246: `DONE` (implemented + enforced pass/fail behavior verified)