Stop the existing orchestrator tmux session:
ORCH_SESSION=cc-ci-orchestrator-vm cc-ci-plan/launch-orchestrator.sh stop

Start a fresh opencode-attached orchestrator session:
LOOP_BACKEND=opencode LOOP_MODEL=openai/gpt-5.4 ORCH_SESSION=cc-ci-orchestrator-vm cc-ci-plan/launch-orchestrator.sh fresh

Alternative: start it under a separate tmux session name instead of replacing the Claude one:
LOOP_BACKEND=opencode LOOP_MODEL=openai/gpt-5.4 ORCH_SESSION=cc-ci-orchestrator-oc cc-ci-plan/launch-orchestrator.sh fresh