Stable checkpoint — Order/Product/OrderLine foundation + common SHA aligned Includes : - Product entity (alembic 0002 + ORM + 12 router tests + Python 3.14 union workaround) - Order entity (alembic 0003 + ORM + minimal CRUD + tests) - OrderLine entity (alembic 0004 + ORM + nested router + Order wire-up) - Common submodule bumped to 3e7acba (bump-common-everywhere.sh + ADR-0055 + retry auto-merge) Post-merge main pipeline #2480582122 green at 15:40.