fix(mcp): Bound fast-exit server close on stdio disconnect

When the MCP parent process exits abruptly with in-flight requests, shutdown can
block indefinitely waiting for server.close(). This keeps npm exec wrapper
processes alive and allows the child node process to climb in RSS.

Add a transport-disconnect fast-exit path that detaches lifecycle handlers,
races server.close() against a short timeout, and then exits immediately.
This preserves normal shutdown behavior for other reasons and keeps Sentry
enabled.

Also add focused unit tests for the bounded close helper outcomes.

Fixes #273

Author: cameroncooke

package-lock.json

@@ -76,7 +76,7 @@
     "@clack/prompts": "^1.0.1",
     "@modelcontextprotocol/sdk": "^1.25.1",
     "@sentry/cli": "^3.1.0",
-    "@sentry/node": "^10.38.0",
+    "@sentry/node": "^10.43.0",
     "bplist-parser": "^0.3.2",
     "chokidar": "^5.0.0",
     "uuid": "^11.1.0",