src/
  index.ts                # public API

  schema/
    index.ts              # barrel
    structure.ts          # StructureEntry, DirEntry, FileEntry...
    hooks.ts              # Hook kinds, HookContext, Hook configs
    config.ts             # ScaffoldConfig + shared base types

  core/
    config-loader.ts      # finds scaffold folder + loads config
    resolve-structure.ts  # resolves StructureEntry[] from txt or JS
    structure-txt.ts      # parses scaffold/structure.txt
    apply-structure.ts    # main engine for create/delete + hooks + cache
    cache-manager.ts
    hook-runner.ts
    watcher.ts
    runner.ts             # runOnce / runWatch orchestration

  cli/
    main.ts               # CLI entry, parses args, calls runner

  util/
    fs-utils.ts
    logger.ts