feat(voice): add prose mode for Craig-authored prose + strengthen em-dash, fragments, formatting

The personal voice patterns only ran for commits and PRs, so the emails and documents I author never got my actual writing voice. General mode deliberately skips them. I added a third mode, prose, that applies my voice patterns to prose I write or send without dragging in the publish-artifact mechanics that misfire on free text.

The modes now nest. General (#1-31) handles anyone's prose, prose adds my voice patterns (em-dash zero-tolerance, contractions, semicolons to periods, sentence-split, felt-experience cut, fragment rewrite, terse-cut, no-emphasis-formatting), and personal adds the three artifact-mechanics patterns on top (first-person rewrite, public-artifact scope flag, praise/correction asymmetry). Those three stay personal-only because they assume a commit or PR: a document is legitimately third-person, a journal has no public-scope concern, and praise/correction asymmetry is a PR-review rule.

Three gaps closed along the way. #13 (em-dash) was "use fewer". It's now zero-tolerance in prose and personal modes, and the rule holds inside examples and quoted text, not just running prose. #37 (every prose sentence needs a subject and a verb) was locked to personal mode. It now applies to my prose too. And #41 is new: I make points with words, not bold or italics or underscores, so emphasis markup gets rephrased so the stress lives in the wording.

I updated commits.md to match. The publish flow still uses personal mode, but the pattern count is now 41 and the personal-only set is the three artifact-mechanics patterns.

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