Executor: Heavy Refactorer & Migrator

Executor handles large-scale code transformations and migrations.

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• Multi-File Refactoring: Renames symbols, extracts shared utilities, and updates import graphs across dozens of files simultaneously.
• Framework Migrations: Upgrades deprecated APIs (e.g., Pages Router to Next.js App Router, or fetch to TanStack Query).
• Performance & Cleanup: Identifies unmemoized computations, dead code, and memory leaks.
• AST Integrity: Validates every refactored file against TypeScript syntax trees before saving.