fix web-probe observe status null handling

scripts/src/hwlab-node-impl.ts

@@ -6882,17 +6882,29 @@ function runNodeWebProbeObserveStatus(options: NodeWebProbeObserveOptions, spec:
   const result = runTransWorkspaceStdinScript(options.node, spec.workspace, script, options.commandTimeoutSeconds);
   const status = parseJsonObject(result.stdout);
   const observerId = webObserveIdFromStatus(status, options);
-  const index = status?.ok !== false && observerId !== null && options.stateDir !== null
+  const statusReadable = status !== null;
+  const ok = result.exitCode === 0 && statusReadable && status.ok !== false;
+  const degradedReason = result.timedOut
+    ? "web-probe-command-timeout"
+    : result.exitCode !== 0
+      ? "web-probe-observe-status-failed"
+      : !statusReadable
+        ? "web-probe-observe-status-unreadable"
+        : typeof status.degradedReason === "string"
+          ? status.degradedReason
+          : null;
+  const index = ok && observerId !== null && options.stateDir !== null
     ? upsertWebObserveIndexEntry(webObserveIndexEntryFromOptions(options, spec, observerId, status))
     : null;
   return {
-    ok: result.exitCode === 0 && status?.ok !== false,
-    status: result.exitCode === 0 ? "observed" : "blocked",
+    ok,
+    status: ok ? "observed" : "blocked",
     command: webObserveCommandLabel("status", options),
     id: observerId,
     node: options.node,
     lane: options.lane,
     workspace: spec.workspace,
+    degradedReason,
     observer: withWebObserveShortcuts(status, observerId),
     index,
     next: observerId === null ? null : webObserveNextCommands(observerId),