feat(goal): drive same-session goal rounds

packages/core/agent/src/types.ts

@@ -120,9 +120,10 @@ export interface Agent {
 
   /**
    * Clear queued and steering work, including work waiting to start, and abort
-   * the active step. The supplied reason is preserved across pre-step and active
-   * cancellation windows, and `whenIdle()` resolves after cancellation reaches
-   * quiescence. Idle cancellation is a no-op and does not arm a later cancel.
+   * the active step. An effective call first emits `agent/cancel-requested` with
+   * the resolved reason. The supplied reason is preserved across pre-step and
+   * active cancellation windows, and `whenIdle()` resolves after cancellation
+   * reaches quiescence. Idle cancellation is a no-op and does not arm a later cancel.
    */
   cancel(reason?: string): void
 
@@ -173,6 +174,16 @@ declare module 'cordis' {
      * @mode emit
      */
     'agent/queued'(this: Scoped<Agent>, agent: Agent, content: ContentBlock[], info: { source: MessageSource; steering: boolean }): void
+    /**
+     * Effective broad cancellation was requested, before queued/steering work
+     * is cleared or the active step is aborted. This observe-only notification
+     * cannot veto cancellation; listener failures are contained.
+     * @param agent - the agent whose current work is being cancelled.
+     * @param reason - resolved cancellation reason, including the default.
+     * Scope-filtered dispatch (`@deepseek-ai/dsh-scope`): agent-scoped listeners receive only that agent.
+     * @mode emit
+     */
+    'agent/cancel-requested'(this: Scoped<Agent>, agent: Agent, reason: string): void
 
     // ---- session lifecycle (emit) ----
     /**