feat: implement Animal Registry view with filtering and pagination (Step 8.1)

- Add status field to filter DSL parser and resolver
- Create AnimalRepository with list_animals and get_facet_counts
- Implement registry templates with table, facet sidebar, infinite scroll
- Create registry route handler with HTMX partial support
- Default shows only alive animals; status filter overrides

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

PLAN.md

@@ -305,15 +305,16 @@ Check off items as completed. Each phase builds on the previous.
 ## Phase 8: Registry & Event Log
 
 ### Step 8.1: Animal Registry View
-- [ ] Create `web/routes/registry.py`:
-  - [ ] GET /registry with filters and pagination
-- [ ] Create `web/templates/registry.py`:
-  - [ ] Table: ID, species, sex, life_stage, location, tags, last event, status
-  - [ ] Facet sidebar with counts
-- [ ] Create `repositories/animals.py` with list_animals, get_facet_counts
-- [ ] Implement infinite scroll (50/page, cursor=base64)
-- [ ] Write tests: renders with animals, pagination works, filters apply
-- [ ] **Commit checkpoint**
+- [x] Create `web/routes/registry.py`:
+  - [x] GET /registry with filters and pagination
+- [x] Create `web/templates/registry.py`:
+  - [x] Table: ID, species, sex, life_stage, location, tags, last event, status
+  - [x] Facet sidebar with counts
+- [x] Create `repositories/animals.py` with list_animals, get_facet_counts
+- [x] Implement infinite scroll (50/page, cursor=base64)
+- [x] Write tests: renders with animals, pagination works, filters apply
+- [x] Add `status` filter field to selection DSL (parser + resolver)
+- [x] **Commit checkpoint**
 
 ### Step 8.2: Event Log Projection & View
 - [ ] Create migration for event_log_by_location table with cap trigger