#36 docs: describe SuperDoc as the DOCX Editor and Agent SDK

Aligns how ooxml.dev describes SuperDoc with SuperDoc's current message: "DOCX Editor and Agent SDK for reviewing, filling, and editing documents." This message is now used on superdoc.dev, the docs, and the READMEs.

• Attribution: "SuperDoc — DOCX editing and tooling" becomes "SuperDoc — DOCX Editor and Agent SDK". This covers the footer, the MCP page, the docs links, the README, and llms.txt.
• Descriptions: "a document engine that renders OOXML natively in the browser" becomes the one-liner, in brand.md, CLAUDE.md, and llms.txt.
• Structured data: the schema.org author is SuperDoc, the organization name, instead of the tagline.

ooxml.dev's own claims are unchanged, such as "implementation notes from building a real document engine". Those describe this site's experience, not SuperDoc's positioning.

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