Add sprint 234 semantic planning coverage gate

docs/progress_log_2026-02-26.md

@@ -97,3 +97,11 @@
 - A/B run shows measurable decomposition delta (TEST_ONLY artifacts):
   - validation taskitems `2 -> 8`
   - avg execution specificity `75.0 -> 84.75`
+
+## Sprint 234 Added (Same Day)
+
+- Added semantic quality gate tooling:
+  - `tools/mcp/check_semantic_planning_gate.py`
+- Integrated optional semantic gate into pipeline with hard-fail behavior.
+- Smoke-verified gate-enabled run (TEST_ONLY):
+  - `logs/taskitem_runs/TEST_ONLY_sprint234_semantic_gate_smoke_20260226/00_summary.json`

docs/sprint234_execution_tracker_2026-02-26.md

@@ -0,0 +1,26 @@
+# Sprint 234 Execution Tracker - 2026-02-26
+
+## Scope
+- `sprint234_plan.md`
+
+## Implemented
+
+- Added gate checker tool:
+  - `tools/mcp/check_semantic_planning_gate.py`
+
+Pipeline integration in `tools/mcp/run_sprint_taskitem_pipeline.sh`:
+- `WSTONE_SEMANTIC_COVERAGE_GATE` (default `0`)
+- `WSTONE_SEMANTIC_MIN_COVERAGE` (default `0.9`)
+- `WSTONE_SEMANTIC_REQUIRE_CAPS_FOR_COMPLEX` (default `1`)
+- `WSTONE_SEMANTIC_MIN_COMPLEXITY_SCORE` (default `2`)
+- emits `00bb_semantic_planning_gate.json` when gate is enabled
+- summary now includes `semantic_planning_gate`
+
+## Baseline Smoke
+
+- gate-enabled smoke run (TEST_ONLY):
+  - `logs/taskitem_runs/TEST_ONLY_sprint234_semantic_gate_smoke_20260226/00_summary.json`
+
+## Explicit Completion Signal
+
+- Sprint 234: `DONE` (implemented + integrated + smoke verified)