ludic.needs: a body's four needs, their rates, meals and the countdown to a collapse as a fact

Warmth, food, water and energy as bars of 0..100; what an hour of doing something
costs them (the package's rates: a full bar is a day at a trip's median); the
countdown when one runs out, reported as NEEDS_CRITICAL / NEEDS_RESTORED /
NEEDS_COLLAPSED facts. The body's work, the air, clothing, the sun, the
difficulty and the effects come through the NeedsWorld port. Its own save
section. Uses ludic_base only; 13 tests.

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

packages/ludic.needs/queries.ludic

@@ -0,0 +1,36 @@
+# queries.ludic - what the world asks the body
+export function needs_level(k: int) -> float {
+  if not nd_ok(k) { return 0.0 }
+  return nd_lv()[k]
+}
+
+export function needs_warmth() -> float { return nd_lv()[NEED_WARMTH] }
+export function needs_food() -> float { return nd_lv()[NEED_FOOD] }
+export function needs_water() -> float { return nd_lv()[NEED_WATER] }
+export function needs_energy() -> float { return nd_lv()[NEED_ENERGY] }
+
+# seconds left before a collapse (0: no countdown), and the need it is for
+export function needs_last_legs() -> float { return nd_legs }
+export function needs_last_need() -> int { return nd_last }
+export function needs_collapses() -> int { return nd_collapses }
+
+# the walk's pace, times: the ramp of each need, and 0.6 more on last legs
+export function needs_pace() -> float {
+  let lv = nd_lv()
+  var m = nd_pace(lv[NEED_WARMTH]) * nd_pace(lv[NEED_FOOD])
+  if NeedsWorld.thirst() { m = m * nd_pace(lv[NEED_WATER]) }
+  if nd_legs > 0.0 { m = m * 0.6 }
+  return m
+}
+
+# running needs legs, calories and a body that is not already in trouble
+export function needs_can_run() -> bool {
+  let lv = nd_lv()
+  return lv[NEED_ENERGY] > 8.0 and lv[NEED_FOOD] > 20.0 and lv[NEED_WARMTH] > 20.0 and lv[NEED_WATER] > 20.0
+}
+
+# the lowest of the four
+export function needs_lowest() -> float {
+  let lv = nd_lv()
+  return Math.min(Math.min(lv[NEED_WARMTH], lv[NEED_FOOD]), Math.min(lv[NEED_WATER], lv[NEED_ENERGY]))
+}