source-file-boundary-refactor

name	source-file-boundary-refactor
description	Split or contain large source files according to the source-file boundary ADR without changing behavior opportunistically.
keywords	["source-size","refactor","boundaries","large-files","modules"]

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.