fix(01-05): align matrix confirmation scope with user and room

- carry Matrix room_id through command callbacks
- persist pending confirmations by user_id and room_id

adapter/matrix/converter.py

@@ -56,7 +56,7 @@ def extract_attachments(event: Any) -> list[Attachment]:
     return []
 
 
-def from_command(body: str, sender: str, chat_id: str) -> IncomingEvent:
+def from_command(body: str, sender: str, chat_id: str, room_id: str | None = None) -> IncomingEvent:
     raw = body.lstrip("!").strip()
     parts = raw.split()
     command = parts[0].lower() if parts else ""
@@ -69,7 +69,11 @@ def from_command(body: str, sender: str, chat_id: str) -> IncomingEvent:
             platform=PLATFORM,
             chat_id=chat_id,
             action=action,
-            payload={"source": "command", "command": command},
+            payload={
+                "source": "command",
+                "command": command,
+                **({"room_id": room_id} if room_id is not None else {}),
+            },
         )
 
     aliases = {
@@ -132,7 +136,7 @@ def from_room_event(event: Any, room_id: str, chat_id: str) -> IncomingEvent | N
     body = (getattr(event, "body", None) or "").strip()
     sender = getattr(event, "sender", "")
     if body.startswith("!"):
-        return from_command(body, sender=sender, chat_id=chat_id)
+        return from_command(body, sender=sender, chat_id=chat_id, room_id=room_id)
     return IncomingMessage(
         user_id=sender,
         platform=PLATFORM,