MigrationSelectorSyntax

Scala 3 extension methods for selector syntax in migrations. These are compile-time-only placeholders that get transformed by the macros.

Provides syntax sugar for selector expressions like:

• _.field.each for collection traversal
• _.variant.when[Type] for case selection
• _.wrapper.wrapped[Inner] for wrapper unwrapping
• _.seq.at(0) for index access
• _.map.atKey(key) for map key access