readiness matrix: downgrade impls to 🚧 for 7620

[chfast]

Because of the recent spec change.

[pdobacz]

Sounds good, but if we're being pedantic, we could degrade also megaspec and EIP, because #86 - this needs rebase, some editorial changes, and potentially expanding by the "no deadsubcontainers" rule.

OTOH the - **EIP-7620** - ethereum/EIPs#8522 (Remove TXCREATE, InitcodeTransaction and the Creator Contract) line can be taken down now, and the 7702 story put in its place (or not?)

[pdobacz]

IIRC, the issue was with the initcode mode validation, and it is now fully specced out (Megaspec & EIPs). Evmone impl is in review, not sure about besu. However, I'm now more inclined to think that if we're doing such feedback-addressing updates, maybe we shouldn't be so strict with downgrading, as the bulk of work is still done.

Also, we had plans to additionally mark cells which are done-done (passing comprehensive reference tests). We can be strict about that.

[pdobacz]

I'm not sure this update is up-to-date anymore. Close or refresh?

[axic]

Ping @chfast @pdobacz

[pdobacz]

Ping @chfast @pdobacz

looks fairly out-of-date by now, closing. I'll look over the readiness tables in general shortly