Give json-schema-ref-no-deref its own handler

One @register per function: revert the stacked decorators and add a dedicated
handler. It just initializes and lists tools (ClientSession never resolves
$refs), with a docstring explaining why that is sufficient.

Author: Kludex

.github/actions/conformance/client.py

@@ -164,10 +164,6 @@ async def handle_callback(self) -> tuple[str, str | None]:
 
 
 @register("initialize")
-# SEP-2106: json-schema-ref-no-deref only requires the client to call tools/list against a
-# server advertising a tool with a network $ref. ClientSession never walks inputSchema or
-# resolves $refs, so plain initialize + list_tools satisfies it; no dedicated handler needed.
-@register("json-schema-ref-no-deref")
 async def run_initialize(server_url: str) -> None:
     """Connect, initialize, list tools, close."""
     async with streamable_http_client(url=server_url) as (read_stream, write_stream):
@@ -178,6 +174,18 @@ async def run_initialize(server_url: str) -> None:
             logger.debug("Listed tools successfully")
 
 
+@register("json-schema-ref-no-deref")
+async def run_json_schema_ref_no_deref(server_url: str) -> None:
+    """Initialize and list tools; the scenario fails only if the client fetches a network $ref.
+
+    ClientSession never walks inputSchema or resolves $refs, so listing is enough (SEP-2106).
+    """
+    async with streamable_http_client(url=server_url) as (read_stream, write_stream):
+        async with ClientSession(read_stream, write_stream) as session:
+            await session.initialize()
+            await session.list_tools()
+
+
 @register("tools_call")
 async def run_tools_call(server_url: str) -> None:
     """Connect, initialize, list tools, call add_numbers(a=5, b=3), close."""