docs(work): close sandcastle-dispatch-v1 epic

docs/work/sandcastle-dispatch-v1/03-dispatch-execute/_story.md

@@ -3,7 +3,7 @@ id: 03-dispatch-execute
 epic: sandcastle-dispatch-v1
 title: Dispatch execute mode — invoke sandcastle.run for impl + review
 type: technical-story
-status: todo
+status: done
 feature: scripts
 depends-on: [02-dispatch-planner]
 blocks: [04-dispatch-cli-wiring]
@@ -11,7 +11,7 @@ blocks: [04-dispatch-cli-wiring]
 
 ## Tasks
 
-- [ ] dispatchImplementer() — calls sandcastle.run with implementer prompt
-- [ ] dispatchReviewer() — calls sandcastle.run with reviewer prompt + diff
-- [ ] applyReviewerDecision() — prints what state mutation WOULD happen
-- [ ] Tests with mocked sandcastle.run
+- [x] dispatchImplementer() — calls sandcastle.run with implementer prompt
+- [x] dispatchReviewer() — calls sandcastle.run with reviewer prompt + diff
+- [x] applyReviewerDecision() — prints what state mutation WOULD happen
+- [x] Tests with mocked sandcastle.run