docs(commits): add Voice and Focus, expand humanizer checklist

Added a new Voice and Focus section between Commit Message Format and Review and Publish. It covers three rules that kept coming up in practice. Write in the user's voice — first person fits, and "This PR introduces X" reads as press-release self-narration. Focus on what was wrong and what was corrected, not the mechanics. Don't stack three or more type signatures or API names in a single sentence.

Also extended the post-humanizer checklist in both the commit-message and PR-description flows. Items (c) "prefer contractions" and (d) "break up long sentences" now sit alongside the existing (a) "rewrite dev-jargon" and (b) "replace semicolons". Uncontracted English reads stiff in short prose, and stacked-clause sentences read easier split on a conjunction.

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