Aient CLI v0.11.18

Aient CLI 0.11.18

Run commands in an Agent-owned sandbox

From aient agent chat THREAD, a ! COMMAND can use the Agent's existing
sandbox without creating a second sandbox or transferring its ownership.
The CLI authorizes the exact server-selected workspace and sandbox incarnation
before starting the command. Reconnect to a detached command with
aient agent execution attach EXECUTION; the same execution ID also works
with status, wait, and cancel.

An ambiguous Start response does not dispatch the command again. Native Agent
sandboxes keep their existing execution behavior. This release does not change
the separate aient sandbox run allocation and workspace-sync flow.