Add semantic fallback gap audit and budget gate (sprints 236-237)

docs/sprint237_execution_tracker_2026-02-26.md

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+# Sprint 237 Execution Tracker - 2026-02-26
+
+## Scope
+- `sprint237_plan.md`
+
+## Implemented
+
+- Added gate checker:
+  - `tools/mcp/check_semantic_fallback_budget.py`
+- Added wrapper for audit+gate:
+  - `tools/mcp/run_semantic_fallback_budget_gate.sh`
+- Added policy controls:
+  - `WSTONE_SEMANTIC_MAX_FALLBACK_RATE` (default `0.35`)
+  - `WSTONE_SEMANTIC_FALLBACK_MIN_RECORDS` (default `5`)
+  - `WSTONE_SEMANTIC_FALLBACK_INCLUDE_GLOB` (run selection)
+
+## Baseline Gate Artifacts
+
+- expected fail (strict budget):
+  - `logs/taskitem_runs/TEST_ONLY_sprint237_semantic_fallback_gate_fail_20260226/semantic_fallback_budget_gate.json`
+- expected pass (relaxed budget):
+  - `logs/taskitem_runs/TEST_ONLY_sprint237_semantic_fallback_gate_pass_20260226/semantic_fallback_budget_gate.json`
+
+## Explicit Completion Signal
+
+- Sprint 237: `DONE` (implemented + pass/fail gate smoke verified)