diff --git a/.kiro/specs/clusterconfig-schema-split/tasks.md b/.kiro/specs/clusterconfig-schema-split/tasks.md
index 78bd3cb9..d0521479 100644
--- a/.kiro/specs/clusterconfig-schema-split/tasks.md
+++ b/.kiro/specs/clusterconfig-schema-split/tasks.md
@@ -62,7 +62,7 @@
   - _Depends: 1.2_
   - _Boundary: Test Fixture Updates_
 
-- [ ] 4. Build the controller and run the full unit test suite
+- [x] 4. Build the controller and run the full unit test suite
   - Build `controller_unit_test` (meson target) with the regenerated capnp bindings and all updated source/test files
   - Run the full existing suite and compare against the pre-spec baseline
   - Observable: build completes with zero compile errors; `controller_unit_test` passes with no new failures attributable to the removed fields