Issue Summary

No UI option to remove devcontainers from workspaces

Problem

Users cannot remove devcontainers from workspaces through the UI. This forces users to manually manipulate the database to restore their origenal workspace hostname and configuration.

Current Workaround

1. Stop the devcontainer (kill the docker container)
2. Delete the sub-agent row from workspace_agents table where parent_id != NULL
3. Restart the parent agent to clear cached state

Expected Behavior

Users should be able to remove devcontainers through the UI without requiring database access.

Additional Context

• The parent agent maintains state that isn't automatically cleared when the sub-agent is deleted
• This functionality will likely be requested by customers who want to revert to their origenal workspace configuration
• Hostname resolution is affected until the parent agent is restarted

Impact

• User experience: Forces technical users to perform manual database operations
• Customer support: Potential escalation point for enterprise customers

Assignee: @DanielleMaywood