fix(cron): improve timezone scheduling and tz propagation

nanobot/cli/commands.py

@@ -719,21 +719,32 @@ def cron_list(
     table.add_column("Status")
     table.add_column("Next Run")
     
+    import datetime
     import time
+    from zoneinfo import ZoneInfo
     for job in jobs:
         # Format schedule
         if job.schedule.kind == "every":
             sched = f"every {(job.schedule.every_ms or 0) // 1000}s"
         elif job.schedule.kind == "cron":
             sched = job.schedule.expr or ""
+            if job.schedule.tz:
+                sched = f"{sched} ({job.schedule.tz})"
         else:
             sched = "one-time"
         
         # Format next run
         next_run = ""
         if job.state.next_run_at_ms:
-            next_time = time.strftime("%Y-%m-%d %H:%M", time.localtime(job.state.next_run_at_ms / 1000))
-            next_run = next_time
+            ts = job.state.next_run_at_ms / 1000
+            if job.schedule.kind == "cron" and job.schedule.tz:
+                try:
+                    dt = datetime.fromtimestamp(ts, ZoneInfo(job.schedule.tz))
+                    next_run = dt.strftime("%Y-%m-%d %H:%M")
+                except Exception:
+                    next_run = time.strftime("%Y-%m-%d %H:%M", time.localtime(ts))
+            else:
+                next_run = time.strftime("%Y-%m-%d %H:%M", time.localtime(ts))
         
         status = "[green]enabled[/green]" if job.enabled else "[dim]disabled[/dim]"
         
@@ -748,6 +759,7 @@ def cron_add(
     message: str = typer.Option(..., "--message", "-m", help="Message for agent"),
     every: int = typer.Option(None, "--every", "-e", help="Run every N seconds"),
     cron_expr: str = typer.Option(None, "--cron", "-c", help="Cron expression (e.g. '0 9 * * *')"),
+    tz: str | None = typer.Option(None, "--tz", help="IANA timezone for cron (e.g. 'America/Vancouver')"),
     at: str = typer.Option(None, "--at", help="Run once at time (ISO format)"),
     deliver: bool = typer.Option(False, "--deliver", "-d", help="Deliver response to channel"),
     to: str = typer.Option(None, "--to", help="Recipient for delivery"),
@@ -758,11 +770,15 @@ def cron_add(
     from nanobot.cron.service import CronService
     from nanobot.cron.types import CronSchedule
     
+    if tz and not cron_expr:
+        console.print("[red]Error: --tz can only be used with --cron[/red]")
+        raise typer.Exit(1)
+
     # Determine schedule type
     if every:
         schedule = CronSchedule(kind="every", every_ms=every * 1000)
     elif cron_expr:
-        schedule = CronSchedule(kind="cron", expr=cron_expr)
+        schedule = CronSchedule(kind="cron", expr=cron_expr, tz=tz)
     elif at:
         import datetime
         dt = datetime.datetime.fromisoformat(at)