fix: build dist before npm publish

[kuitos]

Summary

• switch the published package entrypoints from src to compiled dist output
• add build/prepack scripts so tsc runs before npm packaging
• update the release workflow to install dependencies before semantic-release
• add a regression test covering package publish config and release workflow expectations

Why

The package previously published raw TypeScript from src with no build step in the release flow. This change makes npm publish compiled JavaScript from dist instead.

Validation

• bun test
• bun run build
• npm pack --dry-run --json

[github-actions]

🎉 This PR is included in version 1.6.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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