chore(skills): remove humanizer (superseded by voice)

I deleted humanizer/SKILL.md now that all three callers (commits.md, respond-to-cj-comments.md, start-work.md) invoke /voice instead. The 25 humanizer patterns live on as patterns 1-25 in voice/SKILL.md. Same source (Wikipedia's Signs of AI writing), same prose, same examples — just renumbered alongside the universal good-writing additions and the personal-only patterns.

I also updated .ai/notes.org and .ai/workflows/wrap-it-up.org to reference /voice personal instead of the old humanizer + manual-passes flow. The wrap-it-up change landed upstream in claude-templates first so it survives the next startup rsync.

todo.org gets the matching update: the voice TODO is marked DONE with a "Built and shipped" timestamp, the publish-mode terminology is renamed to personal-mode throughout, the V1 scope checklist is ticked, the open questions are resolved with the answers we landed on during implementation, and the migration section records the delete-not-alias decision.

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