feat(cron): include delivery channel/to in finished event

When a cron job with agentTurn payload completes, include the delivery
target fields (channel and to) in the cron.finished event. This enables
gateway clients to deliver cron messages to specific channels instead
of broadcasting to all user platforms.

Use case: When an agent schedules a reminder like "Remind me on Discord: ...",
the external gateway can now deliver the message only to Discord instead
of all channels.

Changes:
- Add channel/to fields to CronEvent type
- Add channel/to fields to CronRunLogEntrySchema
- Include channel/to from job.payload when emitting finished event

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/cron/service/state.ts

@@ -10,6 +10,10 @@ export type CronEvent = {
   error?: string;
   summary?: string;
   nextRunAtMs?: number;
+  /** Delivery channel from the job payload (for agentTurn jobs). */
+  channel?: string;
+  /** Delivery target from the job payload (for agentTurn jobs). */
+  to?: string;
 };
 
 export type Logger = {

src/cron/service/timer.ts

@@ -103,6 +103,9 @@ export async function executeJob(
       runAtMs: startedAt,
       durationMs: job.state.lastDurationMs,
       nextRunAtMs: job.state.nextRunAtMs,
+      // Include delivery target from payload for agentTurn jobs
+      channel: job.payload.kind === "agentTurn" ? job.payload.channel : undefined,
+      to: job.payload.kind === "agentTurn" ? job.payload.to : undefined,
     });
 
     if (shouldDelete && state.store) {

src/gateway/protocol/schema/cron.ts

@@ -240,6 +240,10 @@ export const CronRunLogEntrySchema = Type.Object(
     runAtMs: Type.Optional(Type.Integer({ minimum: 0 })),
     durationMs: Type.Optional(Type.Integer({ minimum: 0 })),
     nextRunAtMs: Type.Optional(Type.Integer({ minimum: 0 })),
+    /** Delivery channel from the job payload (for agentTurn jobs). */
+    channel: Type.Optional(Type.String()),
+    /** Delivery target from the job payload (for agentTurn jobs). */
+    to: Type.Optional(Type.String()),
   },
   { additionalProperties: false },
 );