Retrigger Cerber on rank changes without startup crashes

[Copilot]

Cerber only applied to cards when the joker was obtained or when cards were added, so cards that became 2s mid-run were skipped. The first pass at fixing that also hooked Card:set_base too early in card initialization, causing startup crashes when base was still nil.

• Behavior

  • Retrigger Cerber when a playing card's rank changes into a 2 during gameplay.
  • Keep the existing one-time full-deck application when Cerber itself is obtained.
  • Restore the original joker text: All 2s become Negative.

• Implementation

  • Centralized Cerber application logic in shared helpers for single-card and multi-card paths.
  • Hooked Card:set_base and SMODS.change_base so transform effects and debug rank changes can reapply Cerber immediately.
  • Limited the hook to transitions from a non-2 rank into 2, avoiding unnecessary work on unrelated base changes.

• Crash fix

  • Replaced get_id() reads in the transform hooks with safe rank checks against card.base.id.
  • Hardened Cerber’s helper path to no-op cleanly while a card is still being initialized.

local function cerber_card_id(card)
	return card and card.base and card.base.id or nil
end

function Card:set_base(...)
	local previous_id = cerber_card_id(self)
	local x = { card_set_base(self, ...) }
	if previous_id ~= 2 and cerber_card_id(self) == 2 then
		Neuratro.trigger_cerber_on_card(self)
	end
	return unpack(x)
end