feat(bot): support concurrent drafts and reply-based edits with error resilience

ai procurement/app/runtime.py

@@ -117,10 +117,11 @@ class BotContext:
     def admin_chat_ids(self) -> set[int]:
         return settings.admin_chat_ids
 
-    async def send(self, chat_id: int, text: str, reply_markup: dict | None = None) -> dict:
+    async def send(self, chat_id: int, text: str, reply_markup: dict | None = None,
+                   reply_to: int | None = None) -> dict:
         """Send + audit-log every outbound message."""
         try:
-            message = await self.bale.send_message(chat_id, text, reply_markup=reply_markup)
+            message = await self.bale.send_message(chat_id, text, reply_markup=reply_markup, reply_to=reply_to)
         except Exception:
             logger.exception("failed to send to chat %s", chat_id)
             message = {}
@@ -137,6 +138,15 @@ class BotContext:
         except Exception:
             await self.send(chat_id, text, reply_markup=reply_markup)
 
+    async def delete(self, chat_id: int, message_id: int | None) -> bool:
+        if not message_id:
+            return False
+        try:
+            return await self.bale.delete_message(chat_id, message_id)
+        except Exception:
+            logger.exception("failed to delete message %s in chat %s", message_id, chat_id)
+            return False
+
     async def _log(self, chat_id: int, direction: str, kind: str, body: str | None = None) -> None:
         try:
             async with SessionLocal() as session: