/// Atomic file writes (write temp + rename) so readers never observe a torn file.
/// Prune a reaped workbench's stale `projects` entry from the shared `~/.claude.json`.
/// Cron expression normalization and validation, shared by routine scheduling.
/// Owner-only (`0700`/`0600`) filesystem helpers for the daemon's secret-bearing tree.
/// Poison-tolerant locking for the in-memory stores.
/// Spawn child processes and reap them so triggers don't leak zombie (`<defunct>`) entries.
/// Startup print printed to stdout when the server begins listening.
/// Unix timestamp utilities.