docs: mark Step 7.5 as complete in PLAN.md

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PLAN.md

@@ -291,14 +291,14 @@ Check off items as completed. Each phase builds on the previous.
 - [x] **Commit checkpoint** (68e1a59)
 
 ### Step 7.5: Move Animals
-- [ ] Create `web/routes/move.py`:
-  - [ ] GET /move - Move Animals form
-  - [ ] POST /actions/animal-move
-- [ ] Create `web/templates/move.py` with selection UI
-- [ ] Implement mismatch confirmation flow
-- [ ] Write tests: form renders, move validation, mismatch (409)
-- [ ] Write test: E2E test #8 (optimistic lock)
-- [ ] **Commit checkpoint**
+- [x] Create `web/routes/move.py`:
+  - [x] GET /move - Move Animals form
+  - [x] POST /actions/animal-move
+- [x] Create `web/templates/move.py` with selection UI
+- [x] Implement mismatch confirmation flow
+- [x] Write tests: form renders, move validation, mismatch (409)
+- [x] Write test: E2E test #8 (optimistic lock)
+- [x] **Commit checkpoint** (ff4fa86)
 
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