Migrate to Rslib

Goal

Migrate tsc and tsup projects to Rslib with minimal behavior changes and clear verification.

Supported source frameworks

• tsc
• tsup

Migration principles (must follow)

1. Official guide first: treat Rslib migration docs as source of truth.
2. Smallest-change-first: complete baseline migration first, then migrate advanced or custom behavior.
3. Do not change business logic: avoid touching source or business logic unless user explicitly asks.
4. Validate before cleanup: keep old tool dependencies/config temporarily if needed; remove only after Rslib is green.

Workflow