Mac memory mysteriously eaten up, and it turns out dozens of orphan node processes were left behind by Feishu's official lark-mcp. The root cause is that its stdio lifecycle only handles data inflow, not pipe closure, so the process doesn't kill itself after the host exits. Upstream issues and PRs were filed but have just sat there unmerged, and the repo hasn't been updated for over a year.

The coreaudiod process was using 45G of memory. Digging into it, the leak came from a Claude Code hook playing sound effects. Fixed it by uninstalling PeonPing and switching to Ghostty's native terminal sound effects instead.