Add impact-by-impact native decomposition coverage gates (sprint 241)

docs/sprint241_execution_tracker_2026-02-26.md

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+# Sprint 241 Execution Tracker - 2026-02-26
+
+## Scope
+- `sprint241_plan.md`
+
+## Implemented
+
+Impact list (dated):
+- `docs/native_decomposition_impact_list_2026-02-26.md`
+
+Profile set (one-by-one):
+- `tools/mcp/profiles/native_decomposition_impact_profiles.json`
+- profiles cover 12 impact surfaces:
+  - API contract evolution
+  - state migration/rollback
+  - security propagation
+  - SLO/latency budget
+  - rollout choreography
+  - multi-file transactional edit
+  - concurrency/locking
+  - projection/environment constraints
+  - polyglot boundary changes
+  - observability/telemetry integrity
+  - data integrity/precision
+  - recovery/replay critical flows
+
+Checker + wrappers:
+- `tools/mcp/check_native_decomposition_impact_coverage.py`
+- `tools/mcp/run_native_impact_coverage_gate.sh`
+- `tools/mcp/analyze_native_impact_coverage.py`
+
+Pipeline integration in `tools/mcp/run_sprint_taskitem_pipeline.sh`:
+- `WSTONE_NATIVE_IMPACT_COVERAGE_GATE` (default `0`)
+- `WSTONE_NATIVE_IMPACT_COVERAGE_ENFORCE` (default `0`)
+- `WSTONE_NATIVE_IMPACT_COVERAGE_PROFILES` (profile path)
+- emits `06_native_impact_coverage.json`
+- summary includes `native_impact_coverage`
+
+## Baseline Validation Artifacts
+
+- soft-gate run:
+  - `logs/taskitem_runs/TEST_ONLY_sprint241_impact_gate_20260226_150403/00_summary.json`
+- hard-gate run (expected block):
+  - `logs/taskitem_runs/TEST_ONLY_sprint241_impact_gate_20260226_150404/06_native_impact_coverage.json`
+- multi-profile fullstack sample:
+  - `logs/taskitem_runs/TEST_ONLY_sprint241_fullstack_impact_20260226_150416/00_summary.json`
+- aggregate report:
+  - `logs/taskitem_runs/TEST_ONLY_sprint241_native_impact_aggregate_20260226/native_impact_coverage_aggregate.json`
+
+Observed signal:
+- Fullstack sample activated `7` profiles, all failing under current shallow native decomposition.
+
+## Explicit Completion Signal
+
+- Sprint 241: `DONE` (implemented + pipeline-integrated + enforced smoke verified)