fix(cron): auto-deliver agent output to explicit targets

docs/automation/cron-jobs.md

@@ -127,6 +127,11 @@ Isolated jobs can deliver output to a channel. The job payload can specify:
 If `channel` or `to` is omitted, cron can fall back to the main session’s “last route”
 (the last place the agent replied).
 
+Delivery notes:
+- If `to` is set, cron auto-delivers the agent’s final output even if `deliver` is omitted.
+- Use `deliver: true` when you want last-route delivery without an explicit `to`.
+- Use `deliver: false` to keep output internal even if a `to` is present.
+
 Target format reminders:
 - Slack/Discord targets should use explicit prefixes (e.g. `channel:<id>`, `user:<id>`) to avoid ambiguity.
 - Telegram topics should use the `:topic:` form (see below).