docs(agent): align event JSDoc with shipped behavior

- agent/error: drop the stale "(plus the logger)" claim; the machine only
  emits the event.
- agent/inbox/claimed: document that a rejected turn boundary ends the
  claimed message without discard or re-emission, and that a later batch
  may reuse the turn number.
- steer(): document that a rejected step leaves steering parked until the
  next wake.
- Fix stray double-space in the inbox inserted/discarded callbacks.
- Sync core.md/core.zh.md mirrors and regenerate the cordis catalog.

docs/core-data-structures/core.md

@@ -573,7 +573,8 @@ interface Agent {
   /**
    * Submit steering for the nearest step. An idle driver schedules a turn;
    * collecting and running drivers consume it at their next step boundary.
-   * Cancellation or disposal may discard pending steering.
+   * A rejected step leaves steering parked in the inbox until the next
+   * wake; cancellation or disposal may discard pending steering.
    * @param message - identified steering content and its producer provenance.
    */
   steer(message: UserMessage): void

docs/core-data-structures/core.zh.md

@@ -581,7 +581,8 @@ interface Agent {
   /**
    * Submit steering for the nearest step. An idle driver schedules a turn;
    * collecting and running drivers consume it at their next step boundary.
-   * Cancellation or disposal may discard pending steering.
+   * A rejected step leaves steering parked in the inbox until the next
+   * wake; cancellation or disposal may discard pending steering.
    * @param message - identified steering content and its producer provenance.
    */
   steer(message: UserMessage): void