Interface ShutdownProcess

packages/mcp-server/src/refresh-loop.ts:131–134

* Cloud Codex P1 (PR #1368, e4da094a59): registering custom SIGINT/SIGTERM * handlers without calling process.exit() suppresses Node's default termination * behavior, leaving the MCP process unable to shut down on signals. * * Cloud Codex P2 (PR #1368, 7de77a70d): exit(0) hides termination cause

 * Process is dependency-injected for tests.
 */
interface ShutdownProcess {
  on: (signal: 'SIGTERM' | 'SIGINT', handler: () => void) => unknown;
  exit: (code: number) => void;
}

const SIGNAL_NUMBERS: Record<'SIGTERM' | 'SIGINT', number> = { SIGTERM: 15, SIGINT: 2 };