release: bump version to 0.70.0

docs/technical/en/README.md

@@ -38,6 +38,7 @@ This is the current Intelligent Planet documentation entry point. Docs are organ
 - [Datasource Collector Settings and Connectivity](/home/ray/dev/linkong/planet/docs/technical/en/datasource-collector-settings-connectivity.md): datasource catalog, collector settings, connectivity validation, and credentials
 - [Datasource API Performance](/home/ray/dev/linkong/planet/docs/technical/en/backend-datasources-api-performance.md): DataSources list API performance and caching
 - [Data Jobs and Outbox Architecture](/home/ray/dev/linkong/planet/docs/technical/en/data-job-earth-sync-architecture.md): PostgreSQL job queue, outbox, listener, and Kafka / Spark evolution boundaries
+- [Backend Enum and String Compatibility Contract](/home/ray/dev/linkong/planet/docs/technical/en/backend-enum-contracts.md): stable protocol states, historical string compatibility, and Earth news decision boundaries
 - [Shared Location Resolution Pipeline Development Guide](/home/ray/dev/linkong/planet/docs/technical/en/location-pipeline-development.md): location resolver / pipeline interfaces, registries, and extension points
 - [News Live Streams Collector Format](/home/ray/dev/linkong/planet/docs/technical/en/earth-news-live-streams-collector-format.md): news, live stream, and media collection payload conventions
 - [Docs Gatekeeper Development Guide](/home/ray/dev/linkong/planet/docs/technical/en/docs-gatekeeper-development.md): backend Docs catalog, Markdown content loading, and Gatekeeper permission groups