fix(shutdown): kill full child process trees and add synchronous exit handler to force-kill remaining child processes

changelog.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## 2026-03-03 - 1.1.1 - fix(shutdown)
+kill full child process trees and add synchronous exit handler to force-kill remaining child processes
+
+- Use tree-kill via SmartExit.killTreeByPid to terminate entire process trees (attempt SIGTERM, fallback to SIGKILL).
+- Replace previous delayed/process.kill calls with awaitable tree-kill for more reliable termination.
+- Add a synchronous process.on('exit') handler that force-kills any remaining child processes as a last-resort safety net.
+- No public API changes; internal robustness/bugfix to shutdown behavior.
+
 ## 2025-12-15 - 1.1.0 - feat(smartexit)
 Add silent logging option, structured shutdown logs, and killAll return stats