feat(workbench): persist operational workflows and events

tests/api/test_problem_details.py

@@ -0,0 +1,42 @@
+from fastapi import FastAPI, HTTPException
+from fastapi.testclient import TestClient
+
+from app.api.problem_details import install_problem_details_handlers
+
+
+def test_structured_http_error_preserves_domain_code_and_recovery_fields():
+    app = FastAPI()
+    install_problem_details_handlers(app)
+
+    @app.get("/lease")
+    async def expired_lease():
+        raise HTTPException(
+            status_code=409,
+            detail={
+                "code": "LEASE_EXPIRED",
+                "message": "Agent lease has expired",
+                "retryable": False,
+                "related_refs": ["task-1"],
+                "recovery_action": "claim_new_generation",
+                "retry_after_seconds": None,
+            },
+        )
+
+    response = TestClient(app).get("/lease")
+
+    assert response.status_code == 409
+    assert response.headers["content-type"].startswith("application/problem+json")
+    assert response.json() == {
+        "type": "https://tjwater.example/problems/LEASE-EXPIRED",
+        "title": "Conflict",
+        "status": 409,
+        "detail": "Agent lease has expired",
+        "instance": "/lease",
+        "code": "LEASE_EXPIRED",
+        "trace_id": response.json()["trace_id"],
+        "errors": [],
+        "retryable": False,
+        "related_refs": ["task-1"],
+        "recovery_action": "claim_new_generation",
+        "retry_after_seconds": None,
+    }