refactor(skills): convert review-code from command to skill

review-code was a command with disable-model-invocation set, so the model could never reach for it on its own. Every time a review fit the moment, the agent had to hand back to me to type the slash command. Moving it to a skill makes it model-invocable while it stays slash-invocable as /review-code.

git mv keeps the file history (99% rename). The frontmatter drops disable-model-invocation and gains name: review-code; the body is unchanged. It also drops the discovery-check paragraph in commits.md, which only existed to find the command on disk when it was missing from the skills list, moot now that the skill shows up there.

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