v1.0.0 of amba

amba SDK for Flutter — full 25-namespace surface for the agent-native backend-as-a-service. Changelog excerpt: Initial public release of the ambaFlutter SDK on pub.dev. ### Added - Ambaclient class wrapping the Amba backend API for Flutter apps: configure with project id + client key; track events; anonymous sign-in; authenticated sign-in via magic link; collection CRUD; AI prompt invocation. - Smoke test fixtures under test/integration/exercising the public surface against a live tenant.