refactor(packages): 0.R5 - the shop's week is rolled by its tick and asking reads it; needs start filled and vehicles start with their list; character, physics, vehicles and nativeecho's lazy starts are defaults; --tighten over all four

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

packages/ludic.shop/system.ludic

@@ -9,5 +9,8 @@ export function shop_reset(shop_st: mut ShopState) -> void {
 export function shop_system() -> System {
   let s = system_new("shop", PH_COMMIT)
   s.reset = fn shop_reset
+  s.tick = fn shop_tick
   return s
 }
+# the week's demand, rolled when the week turns - the questions read it
+function shop_tick(shop_st: mut ShopState, t: Tick) -> void { shop_roll(shop_st) }