Is my cat charging my tarot cards, or just sitting on them?

Probably ordinary cat behavior. Cards are just another interesting surface to sit on, especially when they have your attention. If thinking of it as a little energy recharge feels meaningful to you, that can be your personal interpretation too.

I’d keep the two explanations side by side. There’s no way to establish that the cat is intentionally charging the deck, but you can still treat the moment as a charming part of your practice if it feels right to you. Just move the cards if you need them kept clean or undisturbed.