Internal testbed: Remove package aliases

[JonnyBurger]

Summary

• remove workspace package aliases now that ESM outputs are watched during development
• let package exports maps handle root and subpath resolution normally
• bundle the example testbed in the Linux PR build so broken subpath exports fail in CI

Validation

• bun run bundle-testbed
• bun run build
• bun run stylecheck

Closes #9996

[vercel]

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview	Jul 31, 2026 9:37am
remotion	Ready	Preview	Jul 31, 2026 9:37am

[pullfrog]

✅ No new issues found.

Reviewed changes

• Removed hardcoded webpack aliases — the 60-line aliases object in packages/example/src/webpack-override.mjs is gone; packages now resolve through their exports maps, which are kept in sync via the conventions in packages/transitions/package.json and the monorepo build pipeline
• Added CI bundle test — bun run bundle-testbed runs after the main bun run ci step in push.yml on ubuntu-latest, catching broken subpath exports before release (closes #9996)
• Fixed skills test assertions — (remotion-maps/REFERENCE.md) changed to (./remotion-maps/REFERENCE.md) in claude-code, codex, and kimi plugin tests; the old expectation was a looser substring match that would pass on the actual output regardless, so the new assertion is more specific
• Added Codex-specific preview instructions — makeRemotionCreateOpenPreview() in packages/codex-plugin/build.mts patches the generated remotion-create/SKILL.md to open the preview in the Codex in-app browser instead of a generic in-harness browser; the function throws if source text isn't found, keeping the plugin build in sync with skill changes
• Added Codex preview test — verifies the codex plugin transforms the generated skill output correctly, asserting both the presence of the codex-specific text and the absence of the original wording
• Grammar fix — "If server is" → "If the server is" in remotion-create/SKILL.md

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