feat(ludic.clock): the hours, the day, the moon and a calendar as a mechanic package

A ClockWorld port (owns_world, rest_scale, seed), verbs to set and advance it,
clock_new_day, a DayTurned queue (stayed up past midnight, or slept), a
calendar whose month, year and season are pure functions of the day, and a
System (PH_INPUT) with its own save section. Nine test blocks in
tests/clock_test.ludic with fakes for the port.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/ludic.clock/queries.ludic

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+# queries.ludic - what the world asks the clock
+export function clock_day() -> int { return ck_day }
+export function clock_hours() -> float { return ck_hours }
+export function clock_moon() -> float { return ck_moon }
+export function clock_scale() -> float { return ck_scale }
+
+# game seconds per real second right now, the rest speed-up included
+export function clock_rate() -> float { return ck_scale * ck_rest() }
+
+# the game hours `dt` real seconds are worth at the current rate
+export function clock_hours_in(dt: float) -> float { return dt * clock_rate() / 3600.0 }
+
+export function clock_is_night() -> bool { return ck_hours > ck_night_from or ck_hours < ck_night_to }
+
+# "07:05"
+export function clock_hhmm() -> string {
+  let h = int(Math.floor(ck_hours))
+  let m = int(Math.floor((ck_hours - float(h)) * 60.0))
+  var hs = `{h}`
+  var ms = `{m}`
+  if h < 10 { hs = `0{h}` }
+  if m < 10 { ms = `0{m}` }
+  return hs + ":" + ms
+}