feat(agent): hierarchical executor with path resolve, runtime probe, quiet UI

Make Zed Agent closer to Cursor: deterministic DevOps path index, live Traefik
port probe before blind edits, stop-after-edit, and quieter Russian progress.

scripts/switch-provider.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# Switch PRIMARY_PROVIDER and regenerate litellm_config.yaml
+set -euo pipefail
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT"
+
+PROFILE="${1:-}"
+if [[ -z "$PROFILE" ]]; then
+  echo "Usage: bash scripts/switch-provider.sh <profile>" >&2
+  echo "Profiles:" >&2
+  python3 -c "
+import yaml
+from pathlib import Path
+p = yaml.safe_load(Path('config/providers.yaml').read_text(encoding='utf-8'))
+for k, v in sorted(p.get('profiles', {}).items()):
+    wc = ' [welcome credit]' if v.get('welcome_credit') else ''
+    print(f'  {k:12} {v.get(\"label\", \"\")}{wc}')
+"
+  exit 1
+fi
+
+if [[ ! -f .env ]]; then
+  echo "ERROR: .env missing — copy from .env.example" >&2
+  exit 1
+fi
+
+if grep -q '^PRIMARY_PROVIDER=' .env; then
+  sed -i "s/^PRIMARY_PROVIDER=.*/PRIMARY_PROVIDER=${PROFILE}/" .env
+else
+  echo "PRIMARY_PROVIDER=${PROFILE}" >> .env
+fi
+
+set -a
+# shellcheck disable=SC1091
+source .env
+set +a
+
+python3 scripts/gen-litellm-config.py
+echo ""
+echo "Switched to PRIMARY_PROVIDER=${PROFILE}"
+echo "Redeploy on IFT: bash scripts/deploy.sh  (Swarm configs are immutable — stack rm if deploy fails)"