feat(skills): add voice skill (humanizer + universal + personal passes)

I built voice as a single skill that walks 39 numbered prose-editing patterns. The first 25 patterns come straight from the existing humanizer skill (Wikipedia's Signs of AI Writing). Patterns 26-31 add universal good-writing rules from Strunk & White, Orwell, the Plain English Campaign, and Garner — long-word → short-word, active-over-passive, comma splices, cliché flag, jargon-fragment-in-prose rewrite, and corporate-speak nominalizations. Patterns 32-39 are tagged "personal only" and cover first-person rewrite, semicolon swaps, contractions, sentence-split on conjunctions, felt-experience cut, sentence-fragment-in-prose rewrite, terse cut for rhetorical padding, and a public-artifact scope flag.

Two modes determine which patterns get walked. General mode (default) walks 1-31 and is the right fit for research notes, philosophy and history essays, emails, README prose, journal entries, anything that isn't a commit, PR, or PR review comment. Personal mode walks all 39 patterns and is invoked explicitly by the publish flow in commits.md (and similar callers) so first-person and contraction enforcement don't leak into academic or literary writing where they don't belong.

The follow-up commits migrate callers to /voice and remove the standalone humanizer skill.

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