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

docs/work/sandcastle-dispatch-v1/01-sandcastle-install/_story.md

@@ -3,7 +3,7 @@ id: 01-sandcastle-install
 epic: sandcastle-dispatch-v1
 title: Install @ai-hero/sandcastle + Dockerfile
 type: technical-story
-status: in-progress
+status: done
 feature: tooling
 depends-on: []
 blocks: [02-dispatch-planner]
@@ -11,7 +11,7 @@ blocks: [02-dispatch-planner]
 
 ## Tasks
 
-- [ ] Story scaffold
-- [ ] Add @ai-hero/sandcastle to devDependencies
-- [ ] Create .sandcastle/Dockerfile (minimal node + pnpm)
-- [ ] Verify install + import resolves
+- [x] Story scaffold
+- [x] Add @ai-hero/sandcastle to devDependencies
+- [x] Create .sandcastle/Dockerfile (minimal node + pnpm)
+- [x] Verify install + import resolves