feat(msteams): wire agent integration for Teams messages

- Integrate dispatchReplyFromConfig() for full agent routing
- Add msteams to TextChunkProvider and OriginatingChannelType
- Add msteams case to route-reply (proactive not yet supported)
- Strip @mention HTML tags from Teams messages
- Fix session key to exclude messageid suffix
- Add typing indicator support
- Add proper logging for debugging

src/auto-reply/chunk.ts

@@ -17,7 +17,8 @@ export type TextChunkProvider =
   | "slack"
   | "signal"
   | "imessage"
-  | "webchat";
+  | "webchat"
+  | "msteams";
 
 const DEFAULT_CHUNK_LIMIT_BY_PROVIDER: Record<TextChunkProvider, number> = {
   whatsapp: 4000,
@@ -27,6 +28,7 @@ const DEFAULT_CHUNK_LIMIT_BY_PROVIDER: Record<TextChunkProvider, number> = {
   signal: 4000,
   imessage: 4000,
   webchat: 4000,
+  msteams: 4000,
 };
 
 export function resolveTextChunkLimit(