You'll notice
Useful3 Signal3
The bundled code-walkthrough and pr-explainer skills are gone; other built-in skills stay.
What's wrong with this entry?
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What
The built-in skills "code-walkthrough" and "pr-explainer" are gone and neither name appears anywhere in this build. Other bundled skills including code review, PR review and the cowork plugin are unchanged.
Evidence
pr-explainer
Strings lifted out of the shipped bundle, so the claim above can be checked against them.