🤖Neo Angband: Borg v0.5.0

Added

• Activation identity and the in-shop signal, two of the three remaining BorgResolvers seams from PLANNED.md. makeCoreResolvers now also takes objects (ctx.registries.objects) and state (ctx.state), each independently optional so an older host still gets whichever seams it can supply data for.
• The Borg can now tell whether a worn item grants a named activation and whether it is charged (borg_equips_item / borg_activate_item), by walking the item’s artifact, ego or kind back to the Activation record that grants it - the same precedence obj-make.c applies when the object was created. A mod’s ego or artifact is resolved by the same lookup as core’s.
• The Borg can now tell which shop it is standing in (square_shopnum), which is what lets the town-flow ladder’s shop-interaction steps actually fire. Reads ctx.state directly; needed no new host plumbing, because a level’s Chunk already carries the bound feature registry it was generated with.
• Still open: the power of an unevaluated swap, buy or sell, which needs a core capability (hypothetical player-state simulation) that does not exist yet. See PLANNED.md.