refactor(bus): type outbound runtime events

nanobot/channels/telegram.py

@@ -26,6 +26,7 @@ from telegram.ext import Application, CallbackQueryHandler, ContextTypes, Messag
 from telegram.request import HTTPXRequest
 
 from nanobot.bus.events import OutboundMessage
+from nanobot.bus.outbound_events import ProgressEvent
 from nanobot.bus.queue import MessageBus
 from nanobot.channels.base import BaseChannel
 from nanobot.command.builtin import build_help_text
@@ -36,7 +37,7 @@ from nanobot.utils.helpers import split_message
 
 TELEGRAM_MAX_MESSAGE_LEN = 4000  # Telegram message character limit
 # Telegram's actual API limit is 4096; we split raw markdown at 4000 as a
-# safety margin for mid-stream edits (plain text).  For _stream_end, we split
+# safety margin for mid-stream edits (plain text).  On stream end, we split
 # raw markdown into chunks whose rendered HTML fits Telegram's true 4096-char
 # boundary so the final rendered message never overflows.
 TELEGRAM_HTML_MAX_LEN = 4096
@@ -706,8 +707,10 @@ class TelegramChannel(BaseChannel):
             self.logger.warning("bot not running")
             return
 
+        progress_event = msg.event if isinstance(msg.event, ProgressEvent) else None
+
         # Only stop typing indicator and remove reaction for final responses
-        if not msg.metadata.get("_progress", False):
+        if progress_event is None:
             self._stop_typing(msg.chat_id)
             if reply_to_message_id := msg.metadata.get("message_id"):
                 with suppress(ValueError):
@@ -792,7 +795,7 @@ class TelegramChannel(BaseChannel):
 
         # Send text content
         if msg.content and msg.content != "[empty message]":
-            render_as_blockquote = bool(msg.metadata.get("_tool_hint"))
+            render_as_blockquote = bool(progress_event and progress_event.tool_hint)
             buttons = getattr(msg, "buttons", None) or []
             reply_markup = self._build_keyboard(buttons) if buttons else None
             text = msg.content
@@ -887,15 +890,23 @@ class TelegramChannel(BaseChannel):
     def _is_not_modified_error(exc: Exception) -> bool:
         return isinstance(exc, BadRequest) and "message is not modified" in str(exc).lower()
 
-    async def send_delta(self, chat_id: str, delta: str, metadata: dict[str, Any] | None = None) -> None:
+    async def send_delta(
+        self,
+        chat_id: str,
+        delta: str,
+        metadata: dict[str, Any] | None = None,
+        *,
+        stream_id: str | None = None,
+        stream_end: bool = False,
+        resuming: bool = False,
+    ) -> None:
         """Progressive message editing: send on first delta, edit on subsequent ones."""
         if not self._app:
             return
         meta = metadata or {}
         int_chat_id = int(chat_id)
-        stream_id = meta.get("_stream_id")
 
-        if meta.get("_stream_end"):
+        if stream_end:
             buf = self._stream_bufs.get(chat_id)
             if not buf or not buf.message_id or not buf.text:
                 return