v1.211.0

What's Added:

• Session lifecycle — create (JSON, YAML manifest, or agent config), list, get, update, pause/resume, destroy
• Interaction — stream session events (SSE), send input, resolve HITL, relay native protocol frames
• Workspace I/O — upload/download plus staged multipart transfers for large workspaces
• Sandbox — exec in sandbox, list sandbox sizes
• Checkpoints — create/list/get/delete checkpoints; fork session; rollback
• Agent configs — immutable team-scoped configs and config-backed session create
• Templates (BYOA) — team custom templates and builds
• Triggers / webhooks — webhook and trigger management (including secret rotation)
• Provider auth — start/poll external provider OAuth (e.g. GitHub)
• Policy — validate tool-permission policy against a manifest without creating a session
• Provenance — Session.origin (direct | simulation | evaluation)
• Pause reason — pause_reason on paused sessions (manual, idle, low_balance)