v2.0.0b27

refactor(api): change get_job to use task_id instead of experiment_id

Jobs are stored independently at workspace/jobs/task_id/job_id/, so they
don't need experiment context to be retrieved. This simplifies the API
and better reflects the actual data model.

Also fixes SSH client --remote-xpm option to properly parse commands
with arguments using shlex.split().

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>