Crab grass attack! Help!

I have posted on this sub a couple of times as I progress through my lawn removal journey, and I am back yet again for advice! I naively thought digging up my front yard entirely (and by hand, no less) would eliminate the threat of grass aside from intrusion from neighboring lawns. I thought if I planted densely enough with crimson clover and native wildflower mixes, I might essentially eliminate the threat of grass intrusion. Oh how naive I was! Although the wildflowers and clover are pretty and doing well, with every new rain crabgrass appears. And in. every. single. available. space. Is it in the air? Is it dormant in the soil by the millions? How can i combat this crabgrass, especially without pulling up the intentional plants with it?? Is a little crabgrass acceptable, or will it eventually overrun and parasitize (I HATE how it entangles its roots with the roots of other plants) everything else? Should I dig up the most heavily crabgrassed areas and plant DENSELY (like carpet) with a native grass mix? Please advise! Any help is appreciated!