Humanizer v3.1.0

Humanizer 3.1.0 adds a pattern for replies that re-explain what the reader already knows, and it tightens the skill so each rule is stated once.

What changed

• Added pattern #26 and section F for replies that re-explain context the reader already has (#269). It acts on replies, not standalone writing. 26 patterns total.
• Extended the core rule so "something the reader did not already have" counts the surrounding conversation, not only earlier text.
• Widened #25 to text that describes its own sourcing, assembly, or layout (#290), and added headings written for effect to #20.
• Extended #2 to "That distinction matters." (#277) and to a sentence that explains what an example already showed (#295).
• Narrowed #10 so words the dictionary always hyphenates keep their hyphen. Gave each watched word one pattern, and stated the evidence rule and the no-invention rule once each.
• Fixed the Voice section's dash reference (#273) and the marketplace schema URL (#288).
• Added a Cursor plugin manifest (#278).
• README: opens with a before/after, the five strongest tells, and install steps for each agent. States that getting past AI detectors is not a goal. The full example's rewrite now keeps every fact from its draft and adds none. Version history moved to CHANGELOG.md.

Thanks to @Kutomore, @jkhereford, @jabrahamtech, @dajiaohuang, @jakub-zieba, and @bitnom for the fixes, patterns, and reports in this release.