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[Workers] Announce module registry default on November 1 - #34425
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Summary
Announce that the new JavaScript module registry will become the default for compatibility dates on or after November 1, 2026. Add the
new_module_registryflag documentation and migration guidance, update the bundling reference, and add an October 17 advance changelog with animport.metaexample, early opt-in and later opt-out instructions for bothcf(cloudflare.config.ts) and Wrangler, local testing and deployment commands, links to relevant docs, and the September 2026 blog announcement. Python Workers retain the legacy registry.Companion runtime PR: cloudflare/workerd#7799. Publish this documentation before November 1 so developers can test ahead of the default change. The changelog's date is its announcement date, not the future compatibility boundary. Migration guidance covers import-attribute validation,
require(esm)return values, top-levelawait, and legacy-registry-only flags.Validation:
pnpm run checkpasses with zero Astro diagnostics and a passing Worker TypeScript check. Full Astro builds, Nimbus lint, changelog example TypeScript checks,cf/configTypeScript and configuration-schema checks, edited-changelog Prettier, and documentation links/anchors pass.Documentation checklist