orchestrator: restore opencode web launcher

cc-ci-plan/launch-opencode.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SELF_DIR="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
+FLAKE_ROOT="$(readlink -f "$SELF_DIR/..")"
+FLAKE_HOST="${FLAKE_HOST:-cc-ci-orchestrator-hetzner}"
+DEFAULT_MODEL="${LOOP_MODEL:-openai/gpt-5.4}"
+
+ensure_opencode_web() {
+  if ! systemctl is-enabled --quiet opencode-web.service; then
+    sudo nixos-rebuild switch --flake "$FLAKE_ROOT#$FLAKE_HOST"
+  fi
+
+  if ! systemctl is-active --quiet opencode-web.service; then
+    sudo systemctl start opencode-web.service
+  fi
+}
+
+ensure_opencode_web
+
+export LOOP_BACKEND=opencode
+export LOOP_MODEL="$DEFAULT_MODEL"
+export ORCH_SESSION="${ORCH_SESSION:-cc-ci-orchestrator-oc}"
+
+if [ "$#" -eq 0 ]; then
+  set -- fresh
+fi
+
+exec python3 "$SELF_DIR/launch-orchestrator.py" "$@"