docs-author

@jeduden

Write Markdown documentation that picks the right Diátaxis type (tutorial, how-to, reference, background), derives matching title and summary fragments, and passes a global-English and anti-slop polish. Trigger when the user asks to "draft a doc", "write a how-to", "draft a reference", "write a background page", "rewrite this in the house voice", "summary for this page", "title for this page", "polish for non-native readers", "this reads like AI", "remove AI tells / slop", "what type of doc is this", or "polish the README or landing page". Skip this skill for content-rule fixes (line length, heading hygiene, readability) — those are enforced by `mdsmith check`.