Add raw candidate search scoring and no-uplift guardrail (sprints 248-249)

docs/sprint248_execution_tracker_2026-02-26.md

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+# Sprint 248 Execution Tracker - 2026-02-26
+
+## Scope
+- `sprint248_plan.md`
+
+## Implemented
+
+New tool:
+- `tools/mcp/score_native_tasks_profile_coverage.py`
+  - Scores any raw task set against active impact profiles.
+
+Pipeline integration in `tools/mcp/run_sprint_taskitem_pipeline.sh`:
+- Added controls:
+  - `WSTONE_NATIVE_RAW_CANDIDATE_SEARCH` (default `0`)
+  - `WSTONE_NATIVE_RAW_CANDIDATE_MAX_VARIANTS` (default `8`)
+- Added raw candidate generation/scoring artifacts:
+  - `02ae_candidate_<n>.json`
+  - `02ae_candidate_<n>_tasks.json`
+  - `02ae_candidate_<n>_score.json`
+- Added summary packet:
+  - `native_raw_candidate_search`
+
+## A/B Validation (no overlays)
+
+- candidate search OFF:
+  - `logs/taskitem_runs/TEST_ONLY_sprint248_rawsearch_20260226_153902/00_summary.json`
+- candidate search ON:
+  - `logs/taskitem_runs/TEST_ONLY_sprint248_rawsearch_20260226_153903/00_summary.json`
+
+Observed result:
+- attempted variants: `8`
+- selected variant: `0` (base)
+- `failing_profile_count: 7 -> 7`
+- no raw candidate uplift on this hard sample.
+
+## Explicit Completion Signal
+
+- Sprint 248: `DONE` (implemented + measured; no uplift on current sample)