docs: add Context7 parsing config and agent rules

[adeelraza]

Summary

Extends the existing context7.json, which is already claimed with url and the team public_key (both unchanged), with parsing config for Context7. Coding agents use Context7 to fetch current library docs.

• Description and title for the library.
• Exclusions: .github, test, demo, coverage, dist, CHANGELOG.md and CONTRIBUTING.md, so the index focuses on the README.
• Rules for coding agents:
  • Import EmailEditor from the package root. It's client-only, and the bundle ships 'use client', so it works in the Next.js App Router without next/dynamic.
  • Call loadDesign / saveDesign / exportHtml through emailEditorRef.current?.editor, after onReady.
  • Store the design JSON to reopen designs, and send the exported HTML.
  • Pass Unlayer config through the options prop.
  • For templates written in code, use renderToJson() from @unlayer/react-elements with loadDesign().

Testing

• Validated against Context7's schema (https://context7.com/schema/context7.json). The description and each rule are within the limits.
• Not published to npm: the package only ships dist.
• After merge, refresh the library from the Context7 admin panel so the config is applied.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.43%. Comparing base (5f54f51) to head (5477377).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #535   +/-   ##
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  Coverage   97.43%   97.43%           
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  Files           2        2           
  Lines          78       78           
  Branches       20       20           
=======================================
  Hits           76       76           
  Partials        2        2           

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