Step 553: add sprint 29 integration summary and closure gate

progress.md

@@ -9693,3 +9693,43 @@ reduction targets.
 - `editor/src/CostQualityRegressionSuite.h` within header-size limit (`60` <= `600`)
 - `editor/tests/step552_test.cpp` within test-file size guidance (`167` lines)
 - Header-only architecture and naming conventions remain aligned with `ARCHITECTURE.md`
+
+### Step 553: Sprint 29 Integration + Summary
+**Status:** PASS (8/8 tests)
+
+Completes Sprint 29 integration by synthesizing Step 544-552 readiness signals
+into phase-level and sprint-level outcomes with closure diagnostics.
+
+**Files added:**
+- `editor/src/Sprint29IntegrationSummary.h` - sprint integration module:
+  - aggregates all Phase 29a and 29b gate signals
+  - computes phase pass flags and final Sprint 29 pass flag
+  - emits failure-note diagnostics for missing gates
+  - emits completion notes on full sprint pass
+- `editor/tests/step553_test.cpp` - 8 tests covering:
+  - full sprint pass path
+  - phase-specific failure blocking behavior
+  - success/failure note emission
+  - multi-failure aggregation
+  - all-false boundary behavior
+  - phase-status isolation on single Phase 29b failure
+
+**Files modified:**
+- `editor/CMakeLists.txt` - `step553_test` target
+
+**Verification run:**
+- `cmake -S editor -B editor/build-native` - PASS
+- `cmake --build editor/build-native --target step553_test step552_test` - PASS
+- `./editor/build-native/step553_test` - PASS (8/8)
+- `./editor/build-native/step552_test` - PASS (12/12) regression coverage
+
+**Architecture gate check:**
+- `editor/src/Sprint29IntegrationSummary.h` within header-size limit (`70` <= `600`)
+- `editor/tests/step553_test.cpp` within test-file size guidance (`128` lines)
+- Header-only architecture and naming conventions remain aligned with `ARCHITECTURE.md`
+
+**Sprint 29 totals (544-553):**
+- **Steps completed:** 10
+- **New tests in this sprint plan:** 112/112 passing
+- **Phase 29a (544-548):** 56/56 passing
+- **Phase 29b (549-553):** 56/56 passing