build: complete upgrade to fastapi 0.141, mcp sdk v2, fastmcp 4 and httpx2

tests/wf_mcp/proxy/test_admin.py

@@ -159,7 +159,7 @@ def test_proxy_admin_reload_sends_list_changed_notifications(tmp_path: Path) ->
 
     asyncio.run(run_proxy())
 
-    methods = [notification.root.method for notification in notifications]
+    methods = [notification.method for notification in notifications]
     assert "notifications/tools/list_changed" in methods
     assert "notifications/resources/list_changed" in methods
     assert "notifications/prompts/list_changed" in methods
@@ -205,5 +205,5 @@ def test_proxy_config_mutation_does_not_notify_before_reload(tmp_path: Path) ->
 
     asyncio.run(run_proxy())
 
-    methods = [notification.root.method for notification in notifications]
+    methods = [notification.method for notification in notifications]
     assert "notifications/tools/list_changed" not in methods

tests/wf_mcp/proxy/test_tools.py

@@ -6,10 +6,10 @@ from pathlib import Path
 from typing import Any
 
 import anyio
-import httpx
+import httpx2
 import mcp.types as mcp_types
 import pytest
-from mcp.shared.exceptions import McpError
+from mcp.shared.exceptions import MCPError
 
 from wf_mcp.models import BrokerConfig, ConnectionConfig
 from wf_mcp.proxy import create_proxy_client
@@ -142,17 +142,17 @@ def test_proxy_listing_degrades_when_one_source_has_connection_error(
     ("exc", "expected_log_name"),
     [
         (
-            McpError(
+            MCPError.from_error_data(
                 mcp_types.ErrorData(
                     code=mcp_types.INTERNAL_ERROR,
                     message="connection closed",
                 )
             ),
-            "McpError",
+            "MCPError",
         ),
         (anyio.ClosedResourceError(), "ClosedResourceError"),
         (anyio.EndOfStream(), "EndOfStream"),
-        (httpx.ConnectError("connection refused"), "ConnectError"),
+        (httpx2.ConnectError("connection refused"), "ConnectError"),
     ],
 )
 def test_proxy_listing_degrades_when_session_transport_closes(