All knobs are environment variables with safe defaults — no configuration file required.

Env	Default	Purpose
`DSH_PHOENIX_UNIT`	`dsh-web`	systemd user unit to restart
`DSH_PHOENIX_DELAY`	`8`	seconds between `stop` and `start`
`DSH_PHOENIX_ARMING_MS`	`5000`	ignore signals for N ms after load (prevents self-trigger)
`DSH_PHOENIX_DEBOUNCE_MS`	`3000`	collapse burst signals into one reboot
`DSH_PHOENIX_DEFER_POLL_MS`	`3000`	idle re-check interval while deferring
`DSH_PHOENIX_DEFER_SOFT_MS`	`300000`	soft safety deadline — log a warning at this point, keep waiting
`DSH_PHOENIX_DEFER_HARD_MS`	`900000`	hard safety deadline — force the restart (if policy is `auto`)
`DSH_PHOENIX_DEFER_POLICY`	`auto`	`auto` (force at hard deadline) or `wait` (never force; may defer indefinitely)
`DSH_PHOENIX_HEALTH_MS`	`4000`	browser heartbeat interval
`DSH_PHOENIX_RESTART_CMD`	(empty)	custom restart command override for non-systemd deployments (see the Requirements warning)
`DSH_PHOENIX_REARM_MS`	`8000`	boot delay before the lifecycle recovery/resume check
`DSH_PHOENIX_MAX_RESUME_ATTEMPTS`	`1`	resume attempts per restart (1 = one resume per restart; >1 retries; reaching it ends the continuation)
`DSH_PHOENIX_STATE_FILE`	(empty)	path to the durable lifecycle checkpoint; empty disables the lifecycle

dsh-phoenix

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