Apply refactors across multiple files

Cascade identical edits across N files safely

Apply identical refactor (rename symbol, swap import, migrate signature) across many files in single planned batch rather than N manual passes.

• · before pattern (regex or literal)
• · after pattern
• · file set matching criteria

• · single commit with batch changes
• · verification that before → after uniformly applied

• · sed
• · git
• · grep

Deterministic transformation, N ≥ 4 files, dry-run verified

• · partial cascade leaving inconsistent state
• · collateral damage to unrelated context
• · variant transformations mixed without plan

• · Dry-run on 1-2 candidates before full cascade
• · Single commit with file list
• · Verification regex to confirm before gone, after uniform