# firstlight.rules The one module every part of First Light requires: `require("firstlight.rules")`. It holds the game's numbers (day length, temperatures, calorie burn, stove fuel rates, bear ranges, starting stores), the layout of the station and the sites around it, the shared blackboard `M.state`, the event bus `M.events`, and the clock. ## The clock `M.tick(dt)` is called once per play frame by the scene entrypoint. It advances `M.state.run.elapsed`, derives `M.state.clock` (day, fraction of day, hour, sun elevation, twilight openness) and emits `day`, `noon` and `firstLight`. `M.sleepToMorning()` jumps to 07:00 next day; `M.restore(elapsed)` rebuilds the clock from a persisted run. Pure helpers: `sunElevation(day, t)`, `twilightSeconds(day)`, `airC(day, t)`, `windChill(airC, windMs)`, `progress(day)`, `rng(seed, salt)`, `dist2d`. ## The blackboard `M.state` has one section per slice. A slice writes its own section and reads the others: `run`, `clock`, `weather`, `body`, `hut`, `stores`, `bear`, `journal`. ## Events `M.events.on(name, fn)` returns an unsubscribe function; `M.events.emit(name, payload)` calls every listener. The names and payloads are listed at the top of `init.luau`. `M.say(text, seconds)` emits `say` for the HUD.

# instruments <!-- zero:scaffolded-readme --> <!-- Replace the line below with what this module provides and who consumes it, then delete both comment lines. --> TODO: describe this module.

# theme <!-- zero:scaffolded-readme --> <!-- Replace the line below with what this module provides and who consumes it, then delete both comment lines. --> TODO: describe this module.