docs(skills): keep review-code praise honest and unforced

Two related changes to review-code's strengths guidance. The mandatory "three minimum" could force filler on a tiny diff or padded praise on a weak PR, so I relaxed it to up to three specific strengths, with an honest "nothing notable" allowed when the diff doesn't earn them. I also reframed the old "No Strengths section" anti-pattern as "skipping strengths out of laziness": a substantive diff still demands them, a weak one doesn't.

The other change tells reviewers to name the good thing and stop, without explaining why it's good. Explaining praise reads as sycophantic since the author already knows the rationale. Elaboration is for findings, not compliments.

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