Summary

Add code-specific EDA (Easy Data Augmentation) implementation of SyntheticGenerator trait.

Requirements

• Implement CodeEDA struct with operations:
  • Synonym Replacement (variable renaming)
  • Random Insertion (comments/asserts)
  • Random Swap (reorder independent statements)
  • Random Deletion (dead code removal)
• Quality scoring via AST parse validity + token overlap
• Diversity scoring to detect mode collapse

References

• Wei & Zou (2019) EDA paper
• verificar automl-synthetic-data-codex-spec.md

Acceptance Criteria

• CodeEDA implements SyntheticGenerator<Input=String, Output=String>
• Quality threshold filtering (default 0.75)
• Integration tests with Python/Rust code samples