Materialize, which already charges, now also owns affordability: when credits
are below Price it lists "cannot afford <price> credits" and builds nothing.
The restore menu's separate price < Credits check is deleted; the menu still
shows Loadouts.Price and lists Materialize's failures.
Tests: one credit short builds nothing, leaves credits unchanged and lists the
failure. A fixture gun with an InstantWeapon behavior proves TryUnequip removes
the weapon and its item from every weapon group.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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