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>

tests/test_selection_parser.py

@@ -27,13 +27,52 @@ class TestSimpleFilters:
 
     def test_all_supported_fields(self) -> None:
         """All supported fields should parse."""
-        result = parse_filter("location:strip1 species:duck sex:male life_stage:adult tag:healthy")
-        assert len(result.filters) == 5
+        result = parse_filter(
+            "location:strip1 species:duck sex:male life_stage:adult tag:healthy status:alive"
+        )
+        assert len(result.filters) == 6
         assert result.filters[0].field == "location"
         assert result.filters[1].field == "species"
         assert result.filters[2].field == "sex"
         assert result.filters[3].field == "life_stage"
         assert result.filters[4].field == "tag"
+        assert result.filters[5].field == "status"
+
+
+class TestStatusField:
+    """Test the status field for filtering by animal status."""
+
+    def test_status_alive(self) -> None:
+        """status:alive -> filter by alive status."""
+        result = parse_filter("status:alive")
+        assert result == FilterAST([FieldFilter("status", ["alive"])])
+
+    def test_status_multiple_values(self) -> None:
+        """status:alive|dead -> OR of statuses."""
+        result = parse_filter("status:alive|dead")
+        assert result == FilterAST([FieldFilter("status", ["alive", "dead"])])
+
+    def test_status_all_values(self) -> None:
+        """All status values should parse."""
+        result = parse_filter("status:alive|dead|harvested|sold|merged_into")
+        assert result == FilterAST(
+            [FieldFilter("status", ["alive", "dead", "harvested", "sold", "merged_into"])]
+        )
+
+    def test_status_negated(self) -> None:
+        """-status:dead -> exclude dead animals."""
+        result = parse_filter("-status:dead")
+        assert result == FilterAST([FieldFilter("status", ["dead"], negated=True)])
+
+    def test_status_combined_with_other_fields(self) -> None:
+        """status:alive species:duck -> combine status with other filters."""
+        result = parse_filter("status:alive species:duck")
+        assert result == FilterAST(
+            [
+                FieldFilter("status", ["alive"]),
+                FieldFilter("species", ["duck"]),
+            ]
+        )
 
 
 class TestOrSyntax: