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/store.py

@@ -51,13 +51,26 @@ async def next_chat_id(store: StateStore, matrix_user_id: str) -> str:
     return f"C{index}"
 
 
-async def get_pending_confirm(store: StateStore, room_id: str) -> dict | None:
-    return await store.get(f"{PENDING_CONFIRM_PREFIX}{room_id}")
+def _pending_confirm_key(user_id: str, room_id: str | None = None) -> str:
+    if room_id is None:
+        return f"{PENDING_CONFIRM_PREFIX}{user_id}"
+    return f"{PENDING_CONFIRM_PREFIX}{user_id}:{room_id}"
+
+async def get_pending_confirm(
+    store: StateStore, user_id: str, room_id: str | None = None
+) -> dict | None:
+    return await store.get(_pending_confirm_key(user_id, room_id))
+
+async def set_pending_confirm(
+    store: StateStore, user_id: str, room_id: str | dict, meta: dict | None = None
+) -> None:
+    if meta is None:
+        await store.set(_pending_confirm_key(user_id), room_id)
+        return
+    await store.set(_pending_confirm_key(user_id, str(room_id)), meta)
 
 
-async def set_pending_confirm(store: StateStore, room_id: str, meta: dict) -> None:
-    await store.set(f"{PENDING_CONFIRM_PREFIX}{room_id}", meta)
-
-
-async def clear_pending_confirm(store: StateStore, room_id: str) -> None:
-    await store.delete(f"{PENDING_CONFIRM_PREFIX}{room_id}")
+async def clear_pending_confirm(
+    store: StateStore, user_id: str, room_id: str | None = None
+) -> None:
+    await store.delete(_pending_confirm_key(user_id, room_id))