feat: add Promote Animal action route (Step 9.1 continued)

- Add /actions/promote/{animal_id} GET and /actions/animal-promote POST routes
- Add promote_form() template with nickname, sex, repro_status fields
- Add AnimalRepository.get() method for single-animal lookup
- 10 new tests for promote form rendering and submission

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

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

tests/test_web_actions.py

@@ -423,3 +423,164 @@ class TestHatchRecordingValidation:
         )
 
         assert resp.status_code == 422
+
+
+# =============================================================================
+# Animal Promotion Tests
+# =============================================================================
+
+
+@pytest.fixture
+def unpromoted_animal_id(seeded_db, client, location_strip1_id):
+    """Create an unpromoted animal for testing."""
+    # Create a cohort with one animal
+    resp = client.post(
+        "/actions/animal-cohort",
+        data={
+            "species": "duck",
+            "location_id": location_strip1_id,
+            "count": "1",
+            "life_stage": "adult",
+            "sex": "female",
+            "origin": "purchased",
+            "nonce": "test-fixture-cohort-1",
+        },
+    )
+    assert resp.status_code == 200
+
+    # Get the animal ID
+    row = seeded_db.execute(
+        "SELECT animal_id FROM animal_registry WHERE identified = 0 ORDER BY animal_id DESC LIMIT 1"
+    ).fetchone()
+    return row[0]
+
+
+class TestPromoteFormRendering:
+    """Tests for GET /actions/promote/{animal_id} form rendering."""
+
+    def test_promote_form_renders(self, client, unpromoted_animal_id):
+        """GET /actions/promote/{animal_id} returns 200 with form elements."""
+        resp = client.get(f"/actions/promote/{unpromoted_animal_id}")
+        assert resp.status_code == 200
+        assert "Promote" in resp.text
+
+    def test_promote_form_shows_animal_info(self, client, unpromoted_animal_id):
+        """Form shows animal information."""
+        resp = client.get(f"/actions/promote/{unpromoted_animal_id}")
+        assert resp.status_code == 200
+        # Should show animal ID (truncated)
+        assert unpromoted_animal_id[:8] in resp.text
+
+    def test_promote_form_has_nickname_field(self, client, unpromoted_animal_id):
+        """Form has nickname input field."""
+        resp = client.get(f"/actions/promote/{unpromoted_animal_id}")
+        assert resp.status_code == 200
+        assert 'name="nickname"' in resp.text
+
+    def test_promote_form_has_sex_dropdown(self, client, unpromoted_animal_id):
+        """Form has sex dropdown."""
+        resp = client.get(f"/actions/promote/{unpromoted_animal_id}")
+        assert resp.status_code == 200
+        assert 'name="sex"' in resp.text
+
+    def test_promote_form_not_found(self, client):
+        """Non-existent animal returns 404."""
+        resp = client.get("/actions/promote/01ABCDEFGHIJKLMNOPQRSTUV00")
+        assert resp.status_code == 404
+
+
+class TestPromoteSuccess:
+    """Tests for successful POST /actions/animal-promote."""
+
+    def test_promote_creates_event(self, client, seeded_db, unpromoted_animal_id):
+        """POST creates AnimalPromoted event when valid."""
+        resp = client.post(
+            "/actions/animal-promote",
+            data={
+                "animal_id": unpromoted_animal_id,
+                "nickname": "Daffy",
+                "nonce": "test-promote-nonce-1",
+            },
+            follow_redirects=False,
+        )
+
+        # Should redirect
+        assert resp.status_code == 303
+
+        # Verify event was created
+        event_row = seeded_db.execute(
+            "SELECT type FROM events WHERE type = 'AnimalPromoted' ORDER BY id DESC LIMIT 1"
+        ).fetchone()
+        assert event_row is not None
+        assert event_row[0] == "AnimalPromoted"
+
+    def test_promote_sets_identified(self, client, seeded_db, unpromoted_animal_id):
+        """POST sets identified flag on animal."""
+        resp = client.post(
+            "/actions/animal-promote",
+            data={
+                "animal_id": unpromoted_animal_id,
+                "nickname": "Huey",
+                "nonce": "test-promote-nonce-2",
+            },
+            follow_redirects=False,
+        )
+
+        assert resp.status_code == 303
+
+        # Verify identified is now true
+        row = seeded_db.execute(
+            "SELECT identified FROM animal_registry WHERE animal_id = ?",
+            (unpromoted_animal_id,),
+        ).fetchone()
+        assert row[0] == 1  # identified = true
+
+    def test_promote_sets_nickname(self, client, seeded_db, unpromoted_animal_id):
+        """POST sets nickname on animal."""
+        resp = client.post(
+            "/actions/animal-promote",
+            data={
+                "animal_id": unpromoted_animal_id,
+                "nickname": "Dewey",
+                "nonce": "test-promote-nonce-3",
+            },
+            follow_redirects=False,
+        )
+
+        assert resp.status_code == 303
+
+        # Verify nickname is set
+        row = seeded_db.execute(
+            "SELECT nickname FROM animal_registry WHERE animal_id = ?",
+            (unpromoted_animal_id,),
+        ).fetchone()
+        assert row[0] == "Dewey"
+
+
+class TestPromoteValidation:
+    """Tests for validation errors in POST /actions/animal-promote."""
+
+    def test_promote_missing_animal_id_returns_422(self, client):
+        """Missing animal_id returns 422."""
+        resp = client.post(
+            "/actions/animal-promote",
+            data={
+                "nickname": "Test",
+                "nonce": "test-promote-nonce-4",
+            },
+        )
+
+        assert resp.status_code == 422
+
+    def test_promote_not_found_returns_404(self, client):
+        """Non-existent animal returns 404."""
+        resp = client.post(
+            "/actions/animal-promote",
+            data={
+                "animal_id": "01ABCDEFGHIJKLMNOPQRSTUV00",
+                "nickname": "Test",
+                "nonce": "test-promote-nonce-5",
+            },
+        )
+
+        assert resp.status_code == 404