source-file-boundary-refactor

# source-file-boundary-refactor Reduce source-file boundary debt. ## Procedure 1. Read the source-file boundary ADR and current baseline before editing. 2. Identify the responsibility boundary: parsing, registry data, UI state, rendering, service wiring, tests, fixtures, or utilities. 3. Extract one responsibility at a time while preserving public behavior. 4. Keep entrypoints thin: parse flags, delegate, and return. 5. Add or preserve tests that prove behavior did not change. 6. Update baselines only for accepted exceptions, not to hide new growth. ## Constraints - Do not mix behavior changes into mechanical extraction unless needed for compilation. - Do not grow files above limits except for extraction or explicit architecture approval. - Prefer existing package patterns over new abstraction styles.