fix(slack): preserve thread context for proactive replies

Capture Slack thread metadata for cron and message-tool deliveries so replies stay in the originating thread, and hydrate first thread mentions with recent Slack context.

Made-with: Cursor

nanobot/cron/service.py

@@ -379,6 +379,8 @@ class CronService:
         channel: str | None = None,
         to: str | None = None,
         delete_after_run: bool = False,
+        channel_meta: dict | None = None,
+        session_key: str | None = None,
     ) -> CronJob:
         """Add a new job."""
         _validate_schedule_for_add(schedule)
@@ -395,6 +397,8 @@ class CronService:
                 deliver=deliver,
                 channel=channel,
                 to=to,
+                channel_meta=channel_meta or {},
+                session_key=session_key,
             ),
             state=CronJobState(next_run_at_ms=_compute_next_run(schedule, now)),
             created_at_ms=now,

nanobot/cron/types.py

@@ -27,6 +27,8 @@ class CronPayload:
     deliver: bool = False
     channel: str | None = None  # e.g. "whatsapp"
     to: str | None = None  # e.g. phone number
+    channel_meta: dict = field(default_factory=dict)  # channel-specific routing (e.g. Slack thread_ts)
+    session_key: str | None = None  # original session key for correct session recording
 
 
 @dataclass