fix(restart): send completion notice after channel is ready and unify runtime keys

nanobot/command/builtin.py

@@ -9,6 +9,7 @@ import sys
 from nanobot import __version__
 from nanobot.bus.events import OutboundMessage
 from nanobot.command.router import CommandContext, CommandRouter
+from nanobot.config.runtime_keys import RESTART_NOTIFY_CHANNEL_ENV, RESTART_NOTIFY_CHAT_ID_ENV
 from nanobot.utils.helpers import build_status_content
 
 
@@ -35,6 +36,8 @@ async def cmd_stop(ctx: CommandContext) -> OutboundMessage:
 async def cmd_restart(ctx: CommandContext) -> OutboundMessage:
     """Restart the process in-place via os.execv."""
     msg = ctx.msg
+    os.environ[RESTART_NOTIFY_CHANNEL_ENV] = msg.channel
+    os.environ[RESTART_NOTIFY_CHAT_ID_ENV] = msg.chat_id
 
     async def _do_restart():
         await asyncio.sleep(1)