fix(agent-loop): preserve unified send contracts

packages/core/session/src/types.ts

@@ -82,6 +82,8 @@ export interface CreateSessionOptions {
  */
 export interface TurnTriggerMap {
   message: { kind: 'message'; source: MessageSource }
+  /** Recovery turn reopened over the repaired current session log. */
+  retry: { kind: 'retry' }
   /**
    * An out-of-band context injection (`agent.inject()`) made while the agent
    * was idle. The loop wraps the injected `user/message` (a non-`user` source,