v0.21.0

[0.21.0] - 2026-05-19

Added

• BetaContextMount (Beta) (All SDKs): New direct-mount persistence model that exposes a context as a filesystem mount point inside the session, complementing the existing Context Sync workflow.
  • BetaContextMount model with access_mode (READ_ONLY / READ_WRITE) and strategy (STANDARD / PERFORMANCE).
  • Static mount via CreateSessionParams.beta_context_mounts.
  • Dynamic runtime mount via session.context.bind() (Python / TypeScript / Java) and session.Context.BetaMount() (Go).
  • source_path / sourcePath field for partial subdirectory mounts — projects only the named subdirectory of the context to the mount path.
  • Requires image_id="aio-ubuntu-2404"; other images do not provide the OSS-backed mount.
  • Includes async + sync examples (Python), e2e demos, and a "Migrating from Context Sync to Context Mount" guide in data-persistence.md.

Fixed

• Java: Fixed dynamic context bind params error.
• Java & Go context sync: Fixed a map-overwrite bug in the wait-for-sync logic when the same contextId was bound to multiple paths, which caused only the last path's status to be observed.
• Python: Removed a leftover debug print statement from browser_operator.

Changed

• TypeScript: Applied Prettier formatting across source and tests.
• Golang: Fixed formatting and lint issues.
• CI: Removed Playwright Chromium installation steps; added ci-stable label for continuous integration.