Adds company-membership service with six operations (add, update, end,
setPrimary, listByCompany, listByClient), the corresponding Zod
validators, three socket events, and a unit-test suite covering the
portId-scoping rules, the unique_cm_exact conflict path, and the atomic
setPrimary transaction.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
