Dr. Jill Richardson of the Australian Society for the Protection of Cruelty to Animals' Poison Control Centre approved this list, which DOES include Corydalis:
https://www.cathealth.com/cat-care/toxic-items/1262-cat-toxic-plant-list
However it doesn't appear in this list compiled by our own Cats' Protection:
https://www.cats.org.uk/media/12932/outdoor-plants-may-2023.pdf
That suggest to me that its toxicity may well be more theoretical than actual, possibly because cats don't like the taste of it.
My cats wander around multiple gardens and I've no idea what's in most of them. However they all seem healthy enough to me, so I'm not panicking over any potential toxicity problems. (I'm far more wary around the start of winter, when I know that people in my street might well be topping up the anti-freeze in their cars. Just a few drops of that, licked up off a driveway after a minor spillage, is enough to kill a cat).