feat(packages): ludic.crafting - recipes as an open registry, can / take / refund / make through a pack port, stations through a port, the hold-to-make, a Crafted fact

A recipe is `def CraftRecipes key { out, n, ins: [...], ns: [...], station, minutes, hold,
group, learned }`. The pack is the CraftPack port (count, take, add, room, and `leaves`: what
an item leaves once used, so water gives back its bottle); stations are CraftStations (ready,
start), unbound meaning hands only. craft_make hands a click recipe over or starts a timed one
at its station, refunding when the station refuses; the hold runs from the screen that shows it.
Uses ludic.base only; ten tests with a fake pack and fake stations.

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

packages/ludic.crafting/system.ludic

@@ -0,0 +1,12 @@
+# system.ludic - crafting as a system: a reset, and nothing saved (a hold never outlives its
+# screen; what a station holds is the station's)
+export function craft_reset() -> void {
+  craft_hold_stop()
+  q_clear(craft_facts())
+}
+
+export function craft_system() -> System {
+  let s = system_new("crafting", PH_SIMULATE)
+  s.reset = fn craft_reset
+  return s
+}