feat: support rolldown as an experimental engine

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[Copilot]

Pull Request Overview

This PR adds experimental support for Rolldown as a new bundling engine alongside the existing Rollup and RSLib engines. The implementation includes engine detection, Rolldown-specific configuration options, and comprehensive test coverage.

• Add Rolldown as a new engine type with full configuration support
• Implement Rolldown bundling functionality with shared utilities from Rollup
• Add comprehensive integration tests for React components using Rolldown

Reviewed Changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/pkg/src/types.ts	Add 'rolldown' to EngineType union
packages/pkg/src/tasks/bundle.ts	Implement Rolldown build handling and fix bundle.write binding
packages/pkg/src/engine/rolldown/options.ts	New Rolldown options configuration using shared Rollup utilities
packages/pkg/src/engine/rollup/options.ts	Export shared utilities for use by Rolldown
packages/pkg/src/helpers/taskConfig.ts	Add bundle task assertion helper
packages/pkg/package.json	Add rolldown dependency
tests/helpers/run.ts	Fix test cleanup order and use serialize-javascript for config
tests/integration/react/*	Add React integration tests with Rolldown support
tests/integration/default/index.test.ts	Add Rolldown bundle test case

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commit: 085e7de