hardening: isolate third-party paths and clean external-build metadata (#311)

* hardening: isolate third-party paths and clean external-build metadata

* fix: restore external feedback flow and make privacy check portable

scripts/verify-no-phone-home.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+
+set -euo pipefail
+
+DIST="dist/cli.mjs"
+
+if [ ! -f "$DIST" ]; then
+  echo "ERROR: $DIST not found. Run 'bun run build' first."
+  exit 1
+fi
+
+EXIT=0
+
+BANNED=(
+  "datadoghq.com"
+  "api/event_logging/batch"
+  "api/claude_code/metrics"
+  "getKubernetesNamespace"
+  "/var/run/secrets/kubernetes"
+  "/proc/self/mountinfo"
+  "tengu_internal_record_permission_context"
+)
+
+echo "Checking $DIST for banned patterns..."
+echo ""
+
+for pattern in "${BANNED[@]}"; do
+  COUNT=$(grep -F -c "$pattern" "$DIST" 2>/dev/null || true)
+  COUNT=${COUNT:-0}
+  if [ "$COUNT" -gt 0 ]; then
+    echo "  FAIL: '$pattern' found ($COUNT occurrences)"
+    EXIT=1
+  else
+    echo "  PASS: '$pattern' not found"
+  fi
+done
+
+echo ""
+
+if [ "$EXIT" -eq 0 ]; then
+  echo "✓ All checks passed — no banned patterns in build output"
+else
+  echo "✗ FAILED — banned patterns found in build output"
+fi
+
+exit $EXIT