Fix lint: do not stringify the unknown warmup error (#1688)

Author: RhysSullivan

apps/cloud/src/server.ts

@@ -253,15 +253,14 @@ const warmStartGraph = (env: Env, ctx: ExecutionContext): void => {
           ctx,
         );
         console.log(JSON.stringify({ probe: "warm", ok: true, ms: Date.now() - startedAt }));
-      } catch (err) {
+      } catch {
         // Advisory only — the request path still loads the graph lazily.
         startGraphWarmupStarted = false;
         console.log(
           JSON.stringify({
             probe: "warm",
             ok: false,
             ms: Date.now() - startedAt,
-            err: String(err),
           }),
         );
       }