OSS-first docs
These docs teach the open system first: contracts, generated surfaces, runtimes, governance, and incremental adoption. Studio shows up as the operating layer on top, not as the source of truth.
`createI18nFactory` removes the per-package i18n boilerplate (interpolation, registry management, locale resolution, `t()` wiring).
Instances and factories additionally expose `snapshot()` and `hydrationPayload()`, and the module exports `createI18nFactoryFromSnapshot` / `createI18nFactoryFromHydrationPayload` to rebuild a factory on the client. These additions are **ADDITIVE** and do not change resolution behavior for existing consumers.