feat(deck): surface remapped labels in move-card response

Round-3 review polish on PR #885:

- deck_move_card_to_board now captures the moved DeckCard and returns its
  post-move label titles in CardOperationResponse.labels, so LLM clients can
  confirm the cross-board label remap (the tool's headline behaviour) without
  a follow-up deck_get_card. The field is optional and defaults to None for
  the other card operations that share this response model.
- Tighten test_move_card_to_board_restores_done_state to assert the returned
  card reflects the restored done state.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

nextcloud_mcp_server/models/deck.py

@@ -337,6 +337,14 @@ class CardOperationResponse(StatusResponse):
     card_id: int = Field(description="ID of the affected card")
     stack_id: int = Field(description="ID of the stack containing the card")
     board_id: int = Field(description="ID of the board containing the card")
+    labels: list[str] | None = Field(
+        default=None,
+        description=(
+            "Label titles on the card after the operation, when relevant — "
+            "e.g. after a cross-board move that remaps board-scoped labels to "
+            "the destination board"
+        ),
+    )
 
 
 # Label Response Models

nextcloud_mcp_server/server/deck.py

@@ -1291,7 +1291,7 @@ def configure_deck_tools(mcp: FastMCP):
             order: Position within the destination stack (default 0 = top)
         """
         client = await get_client(ctx)
-        await client.deck.move_card_to_board(
+        moved = await client.deck.move_card_to_board(
             source_board_id,
             source_stack_id,
             card_id,
@@ -1299,12 +1299,15 @@ def configure_deck_tools(mcp: FastMCP):
             target_stack_id,
             order,
         )
+        # Surface the post-move labels so callers can confirm the remap without
+        # a follow-up get_card (label remapping is this tool's whole point).
         return CardOperationResponse(
             success=True,
             message="Card moved to board successfully",
             card_id=card_id,
             stack_id=target_stack_id,
             board_id=target_board_id,
+            labels=[label.title for label in (moved.labels or [])],
         )
 
     # Label Tools

tests/client/deck/test_deck_move_card_api.py

@@ -122,7 +122,7 @@ async def test_move_card_to_board_restores_done_state(mocker):
     )
 
     client = DeckClient(mocker.AsyncMock(spec=httpx.AsyncClient), "testuser")
-    await client.move_card_to_board(
+    result = await client.move_card_to_board(
         source_board_id=1,
         source_stack_id=10,
         card_id=8,
@@ -134,6 +134,8 @@ async def test_move_card_to_board_restores_done_state(mocker):
     done_call = mock_make_request.call_args_list[3]
     assert done_call.args[0] == "PUT"
     assert done_call.args[1] == "/apps/deck/cards/8/done"
+    # The returned card reflects the re-fetched (restored) done state
+    assert result.done is not None
 
 
 async def test_move_card_to_board_rejects_stack_not_on_target_board(mocker):