Create Auth Skill Guide for adding authentication to TypeScript/JavaScript applications using Better Auth. For code examples and syntax, see better-auth.com/docs. --- Phase 1: Planning (REQUIRED before implementation) Before writing any code, gather requirements by scanning the project and asking the user structured questions. This ensures the implementation matches their needs. Step 1: Scan the project Analyze the codebase to auto-detect: - Framework — Look for , , , , , or Express/Hono entry files. - Database/ORM — Look for , , deps ( , , , , , , ). If exists, read its field to determine th…