fix(agents): handle overloaded failover separately (#38301)

* fix(agents): skip auth-profile failure on overload

* fix(agents): note overload auth-profile fallback fix

* fix(agents): classify overloaded failures separately

* fix(agents): back off before overload failover

* fix(agents): tighten overload probe and backoff state

* fix(agents): persist overloaded cooldown across runs

* fix(agents): tighten overloaded status handling

* test(agents): add overload regression coverage

* fix(agents): restore runner imports after rebase

* test(agents): add overload fallback integration coverage

* fix(agents): harden overloaded failover abort handling

* test(agents): tighten overload classifier coverage

* test(agents): cover all-overloaded fallback exhaustion

* fix(cron): retry overloaded fallback summaries

* fix(cron): treat HTTP 529 as overloaded retry

docs/automation/cron-jobs.md

@@ -370,6 +370,7 @@ When a job fails, OpenClaw classifies errors as **transient** (retryable) or **p
 ### Transient errors (retried)
 
 - Rate limit (429, too many requests, resource exhausted)
+- Provider overload (for example Anthropic `529 overloaded_error`, overload fallback summaries)
 - Network errors (timeout, ECONNRESET, fetch failed, socket)
 - Server errors (5xx)
 - Cloudflare-related errors
@@ -407,7 +408,7 @@ Configure `cron.retry` to override these defaults (see [Configuration](/automati
     retry: {
       maxAttempts: 3,
       backoffMs: [60000, 120000, 300000],
-      retryOn: ["rate_limit", "network", "server_error"],
+      retryOn: ["rate_limit", "overloaded", "network", "server_error"],
     },
     webhook: "https://example.invalid/legacy", // deprecated fallback for stored notify:true jobs
     webhookToken: "replace-with-dedicated-webhook-token", // optional bearer token for webhook mode
@@ -665,7 +666,7 @@ openclaw system event --mode now --text "Next heartbeat: check battery."
 - OpenClaw applies exponential retry backoff for recurring jobs after consecutive errors:
   30s, 1m, 5m, 15m, then 60m between retries.
 - Backoff resets automatically after the next successful run.
-- One-shot (`at`) jobs retry transient errors (rate limit, network, server_error) up to 3 times with backoff; permanent errors disable immediately. See [Retry policy](/automation/cron-jobs#retry-policy).
+- One-shot (`at`) jobs retry transient errors (rate limit, overloaded, network, server_error) up to 3 times with backoff; permanent errors disable immediately. See [Retry policy](/automation/cron-jobs#retry-policy).
 
 ### Telegram delivers to the wrong place