docs(commits): add first-person voice as a personal-style pass

I told Claude that the commit-message draft should sound personal, like it's coming from me. That move wasn't in the documented passes, so the drafts kept landing on impersonal third-person ("Add a test for X", "The change introduces Y"). I had to ask for the rewrite each time.

First person is now the new pass (a) in all three subflows: commit messages, PR descriptions, PR review comments. The subject line and PR title stay imperative per Conventional Commits, and I left an exception for purely mechanical bodies where the subject already carries the message. I bumped the Multi-pass gate counts and the example announcement string to match.

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