// Package engine provides a tick scheduler that drives all time-based
// world simulation.
//
// The Engine runs on a 600ms interval. Subscribers register callbacks with
// a tick interval (1 = every tick, N = every Nth tick). Callbacks return
// true to remain subscribed or false to auto-unsubscribe.
//
// The main game loop subscribes a single callback that advances combat,
// regeneration, wandering, woodcutting depletion, fire decay, and player
// actions all on the same tick beat.
package engine