test(mcp): import the fake server class under mcp 1.x and 2.x

mcp 2.x removed mcp.server.fastmcp (the high-level server is now
mcp.server.MCPServer), so the fake stdio server in this test failed to
start on hosts with mcp 2.x installed and four tests failed there. CI pins
mcp<2, so this only affected local runs. Try the 1.x import first and fall
back to the 2.x name.

tests/test_mcp_runtime_profile_scope.py

@@ -51,7 +51,10 @@ WRITE_TOOL = "mcp__atlassian__jira_create_issue"
 
 FAKE_SERVER = textwrap.dedent('''
     import os
-    from mcp.server.fastmcp import FastMCP
+    try:  # mcp 1.x (CI pins mcp<2)
+        from mcp.server.fastmcp import FastMCP
+    except ImportError:  # mcp 2.x renamed the high-level server to MCPServer
+        from mcp.server import MCPServer as FastMCP
 
     mcp = FastMCP("fake-atlassian")