fix: hide readiness exception details (#113)

src/main.py

@@ -22,6 +22,10 @@ FRONTEND_DIR = Path(__file__).resolve().parent.parent / "frontend"
 class ContextPayloadError(ValueError):
     """Raised when Gitea returns a structurally invalid context payload."""
 
+
+class ReadinessPayloadError(ValueError):
+    """Raised when Gitea returns a structurally invalid readiness payload."""
+
 app.add_middleware(
     CORSMiddleware,
     allow_origins=["*"],
@@ -56,13 +60,19 @@ async def readiness():
             current_user(), timeout=READINESS_TIMEOUT_SECONDS
         )
         if not isinstance(user, dict) or not user.get("login"):
-            raise ValueError("Gitea current-user response did not include a login")
+            raise ReadinessPayloadError(
+                "Gitea current-user response did not include a login"
+            )
     except Exception as exc:
         timed_out = isinstance(exc, TimeoutError)
         error_message = (
             f"Gitea readiness check timed out after {READINESS_TIMEOUT_SECONDS:g}s"
             if timed_out
-            else str(exc)
+            else (
+                str(exc)
+                if isinstance(exc, ReadinessPayloadError)
+                else "Gitea readiness check is temporarily unavailable"
+            )
         )
         return JSONResponse(
             {