# Sprint 260 Execution Tracker - 2026-02-26

## Scope
- `sprint260_plan.md`

## Implemented

New tool:
- `tools/mcp/synthesize_raw_signal_targeted_variants.py`
  - Reads prioritized missing signals from raw backlog.
  - Emits focused and bundled normalized-requirement variants keyed to signal class.

Pipeline integration in `tools/mcp/run_sprint_taskitem_pipeline.sh`:
- Added:
  - `WSTONE_NATIVE_RAW_SIGNAL_TARGETED_VARIANTS`
  - `WSTONE_NATIVE_RAW_SIGNAL_TARGETED_MAX_VARIANTS`
- Raw search now optionally merges:
  - profile variants (`synthesize_raw_candidate_requirement_variants.py`)
  - signal-targeted variants (`synthesize_raw_signal_targeted_variants.py`)
- Added summary packet:
  - `native_raw_signal_targeted_variants`

## Validation Artifacts

OFF:
- `logs/taskitem_runs/01a_fallback_intake_spec_20260226_163629/00_summary.json`

ON:
- `logs/taskitem_runs/01a_fallback_intake_spec_20260226_163556/00_summary.json`
- generated signal variant payload:
  - `logs/taskitem_runs/01a_fallback_intake_spec_20260226_163556/02ae_raw_signal_targeted_variants.json`

Observed result on hard sample:
- OFF: `available_variants=2`, `attempted_variants=3`, `selected_variant=0`
- ON: `available_variants=8`, `attempted_variants=8`, `selected_variant=0`
- `best_top_gap_score` remained `0` and `failing_profile_count` remained `1`

## Explicit Completion Signal

- Sprint 260: `DONE` (implemented + validated; intrinsic uplift still pending)