mpyw / FILTER_VALIDATE_EMAIL.js / 29547277373

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refactor: drop the IIFE bundle, ship ESM only (#19)

Browsers load the package as an ES module straight from a CDN (esm.sh /
jsDelivr `+esm` / unpkg `?module`), so the separate minified IIFE global was
redundant. Removing it:

- tsup: single ESM (+dts) build; clean handled by tsup itself (drop the
  `prebuild` script and its dual-build clean race).
- package.json: drop `unpkg`/`jsdelivr` fields (they pointed at the IIFE).
- README: CDN section now uses `<script type="module">` with esm.sh, which also
  exposes the default export as a directly-callable `validateEmail(...)` instead
  of the old `FilterValidateEmail.default(...)` global.

No dependency changes; package-lock.json is untouched.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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