Surface aggregate status (error, provisioning, running, ready, no sandbox)
as a colored pill in the transcript panel header. Integrates task runtime
status, session status, and sandbox availability via the sandboxProcesses
interest topic so the pill accurately reflects unreachable sandboxes.
Includes mock tasks demonstrating error, provisioning, and running states,
unit tests for deriveHeaderStatus, and workspace-dashboard integration.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
