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/ports.ludic

@@ -0,0 +1,20 @@
+# ports.ludic - what crafting asks the game: the pack, and the stations
+# the pack. `leaves` is what an item leaves behind once used (water leaves its bottle), -1 nothing.
+export port CraftPack {
+  count: fn(int) -> int
+  take: fn(int, int) -> bool
+  add: fn(int, int) -> int
+  room: fn(int) -> int = fn cr_no_limit
+  leaves: fn(int) -> int = fn cr_leaves_nothing
+}
+function cr_no_limit(it: int) -> int { return 2147483647 }
+function cr_leaves_nothing(it: int) -> int { return -1 }
+
+# the stations. Unbound, there are none: only the hands are ready, and nothing can be started.
+# `start(station, recipe)` puts a timed recipe in; false gives the makings back.
+export port CraftStations {
+  ready: fn(int) -> bool = fn cr_hands_only
+  start: fn(int, int) -> bool = fn cr_no_start
+}
+function cr_hands_only(station: int) -> bool { return station == CRAFT_HANDS }
+function cr_no_start(station: int, recipe: int) -> bool { return false }