Move fully to schemer - off-board deprecated kwalify

[simi]

• first commit -> I have ported 2 stricter checks to not lower the barrier
• second commit -> removed kwalify infrastructure

[simi]

@jasnow follow-up for #1067 (comment)

[jasnow]

Step 1: Separate the 2 commits into 2 PRs so we can deal with these individually.

[simi]

@jasnow 🫡 happy to migrate also to https://github.com/jasnow/rkwalify if that's the preferred way forward now.

[jasnow]

I have 4 choices to consider for the kwality future but would prefer to
step 1 first and merge the part that is just adding checks.

[jasnow]

Wrong PR approved

[simi]

Yup, I'll offboard the update to separate PR.