feat(compact): recover context overflow (PR3 phase 2)

docs/config-catalog.md

@@ -220,7 +220,9 @@ export interface BasicCompactConfig {
   maxTokens?: number
   /** Extra attempts after the first compaction when pressure remains above threshold. Defaults to `1`. */
   compactionRetries?: number
-  /** Enable the automatic `agent/pre-step` pressure listener. Defaults to `true`. */
+  /** Maximum retries after canonical context overflow; `0` disables recovery. Defaults to `1`. */
+  maxOverflowRetries?: number
+  /** Enable automatic post-step pressure and overflow-recovery listeners. Defaults to `true`. */
   auto?: boolean
 }