Configuration Surface

Configuration belongs in the public surface only when a reader must understand it to use the package safely.

Package Surface

• schema-version and migration choices
• serialization format expectations
• compatibility defaults that downstream packages must review explicitly

First Proof Check

• src/bijux_proteomics_foundation/ids.py and schema.py
• src/bijux_proteomics_foundation/serialization.py and migrations.py
• packages/bijux-proteomics-foundation/tests