feat: add FastAPI app factory and health check endpoint

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_health.py

@@ -0,0 +1,30 @@
+"""Tests for the health check endpoint."""
+
+from fastapi.testclient import TestClient
+
+
+class TestHealthCheck:
+    """Tests for GET /health."""
+
+    def test_health_returns_200(self, client: TestClient) -> None:
+        """GET /health should return HTTP 200."""
+        response = client.get("/health")
+        assert response.status_code == 200
+
+    def test_health_returns_status_ok(self, client: TestClient) -> None:
+        """GET /health should return a JSON body with status 'ok'."""
+        response = client.get("/health")
+        data = response.json()
+        assert data["status"] == "ok"
+
+    def test_health_includes_app_name(self, client: TestClient) -> None:
+        """GET /health should include the application name."""
+        response = client.get("/health")
+        data = response.json()
+        assert data["app"] == "sneakyswole"
+
+    def test_health_includes_version(self, client: TestClient) -> None:
+        """GET /health should include the application version."""
+        response = client.get("/health")
+        data = response.json()
+        assert "version" in data