Adding Cursor, Windsurf, and VS Code editor surface tests to an MCP integration harness

An MCP integration harness had behavioral coverage for Claude, Codex, OpenCode, and OpenClaw but lacked the next high-value editor/client surfaces: Cursor Agent CLI, Windsurf, and VS Code extension packaging. Cursor exposed a headless agent path, while Windsurf and VS Code exposed noninteractive editor configuration/package paths rather than a stable headless chat runner.