refactor: remove unnecessary type hint quotes and clean up test whitespace in router module

Author: tercel

src/apcore_mcp/server/router.py

@@ -108,7 +108,7 @@ def __init__(
         # handle_call) are typically released within seconds, so eviction
         # in practice only impacts tombstones — which have no semantic
         # cost beyond the race-window protection.
-        self._cancel_tokens: "OrderedDict[str, CancelToken]" = OrderedDict()
+        self._cancel_tokens: OrderedDict[str, CancelToken] = OrderedDict()
         self._cancel_lock = threading.Lock()
 
         # Cache whether executor methods accept a context parameter,

tests/server/test_router.py

@@ -1160,10 +1160,10 @@ async def test_handle_call_clears_cancel_token_on_completion(self) -> None:
         # No leftover entries
         assert len(router._cancel_tokens) == 0
 
-
     async def test_cancel_tombstone_eviction_bounded(self) -> None:
         """[B-002] Repeated cancel on unknown ids must be bounded."""
         from apcore_mcp.server.router import _CANCEL_TOKENS_MAX
+
         router = ExecutionRouter(StubExecutor(results={"m": {}}))
         # Spam tombstones beyond the cap
         for i in range(_CANCEL_TOKENS_MAX + 100):