fix(conformance): pass json-schema-ref-no-deref client scenario

Register the SEP-2106 conformance scenario in the everythingClient and
remove it from expected-failures.yaml. The client already blocks
non-local $ref dereferencing via assertSchemaSafeToCompile.

Author: mattzcarey

test/conformance/expected-failures.yaml

@@ -21,8 +21,6 @@ client:
     # SEP-2243 (HTTP standardization): no fixture handler / client header support yet.
     - http-custom-headers
     - http-invalid-tool-headers
-    # SEP-2106 (JSON Schema $ref handling): client still dereferences network $refs.
-    - json-schema-ref-no-deref
     # SEP-2468 (authorization response iss parameter): not implemented in the client.
     - auth/iss-supported
     - auth/iss-not-advertised

test/conformance/src/everythingClient.ts

@@ -144,6 +144,12 @@ async function runToolsCallClient(serverUrl: string): Promise<void> {
 registerScenario('initialize', runBasicClient);
 registerScenario('tools_call', runToolsCallClient);
 
+// ============================================================================
+// JSON Schema $ref scenario (SEP-2106)
+// ============================================================================
+
+registerScenario('json-schema-ref-no-deref', runBasicClient);
+
 // ============================================================================
 // Auth scenarios - well-behaved client
 // ============================================================================