chore: make ruff format and ty clean

Format two mcp modules with the current ruff, and narrow the text-block
check in conversation_store through a typed helper so ty stops flagging
dict.get on an unnarrowed block.

src/beaver_gateway/mcp/lenient.py

@@ -84,23 +84,19 @@ class LenientStdioTransport(ClientTransport):
         self, **session_kwargs: Unpack[SessionKwargs]
     ) -> AsyncIterator[ClientSession]:
         errlog: TextIO = self.log_file if self.log_file is not None else sys.stderr
-        async with _lenient_stdio_client(
-            StdioServerParameters(
-                command=self.command,
-                args=self.args,
-                env=self.env,
-                cwd=self.cwd,
-            ),
-            errlog=errlog,
-        ) as (read_stream, write_stream), ClientSession(
-            read_stream, write_stream, **session_kwargs
-        ) as session:
+        async with (
+            _lenient_stdio_client(
+                StdioServerParameters(
+                    command=self.command, args=self.args, env=self.env, cwd=self.cwd
+                ),
+                errlog=errlog,
+            ) as (read_stream, write_stream),
+            ClientSession(read_stream, write_stream, **session_kwargs) as session,
+        ):
             yield session
 
     def __repr__(self) -> str:
-        return (
-            f"<LenientStdioTransport(command={self.command!r}, args={self.args!r})>"
-        )
+        return f"<LenientStdioTransport(command={self.command!r}, args={self.args!r})>"
 
 
 @contextlib.asynccontextmanager
@@ -133,9 +129,7 @@ async def _lenient_stdio_client(  # noqa: PLR0915 — mirrors mcp.client.stdio.s
             command=command,
             args=server.args,
             env=(
-                {**env_default, **server.env}
-                if server.env is not None
-                else env_default
+                {**env_default, **server.env} if server.env is not None else env_default
             ),
             errlog=errlog,
             cwd=server.cwd,
@@ -164,9 +158,7 @@ async def _lenient_stdio_client(  # noqa: PLR0915 — mirrors mcp.client.stdio.s
                         if not stripped:
                             continue
                         try:
-                            message = types.JSONRPCMessage.model_validate_json(
-                                stripped
-                            )
+                            message = types.JSONRPCMessage.model_validate_json(stripped)
                         except Exception:  # noqa: BLE001 — by design, see module doc
                             _log.debug(
                                 "lenient stdio: dropped non-JSON line: %r",
@@ -194,10 +186,7 @@ async def _lenient_stdio_client(  # noqa: PLR0915 — mirrors mcp.client.stdio.s
         except anyio.ClosedResourceError:
             await anyio.lowlevel.checkpoint()
 
-    async with (
-        anyio.create_task_group() as tg,
-        process,
-    ):
+    async with anyio.create_task_group() as tg, process:
         tg.start_soon(stdout_reader)
         tg.start_soon(stdin_writer)
         try:

src/beaver_gateway/mcp/types.py

@@ -62,9 +62,7 @@ class PythonToolMcp(_BaseMcp):
     tools: tuple[Callable[..., object], ...]
 
 
-McpServerT = Annotated[
-    StdioMcp | HttpMcp | PythonToolMcp, Field(discriminator="kind")
-]
+McpServerT = Annotated[StdioMcp | HttpMcp | PythonToolMcp, Field(discriminator="kind")]
 
 
 class McpServer: