Recover local Sendico session after BFF network restarts (#57)

infra/local/sendico/network.sh

@@ -0,0 +1,20 @@
+# Restarting the network-owning BFF can strand this sidecar in its old namespace.
+# Exiting the session process lets Docker rejoin the BFF's current namespace.
+watch_network() {
+ network_parent=$1
+ case "$network_parent" in ''|*[!0-9]*) return 1;; esac
+ [ "$network_parent" -gt 0 ] || return 1
+ network_failures=0
+ while sleep 10; do
+  if timeout 5 getent hosts vault >/dev/null 2>&1; then
+   network_failures=0
+   continue
+  fi
+  network_failures=$((network_failures+1))
+  if [ "$network_failures" -ge 3 ]; then
+   echo 'Local Sendico network DNS unavailable; restarting session container to reattach BFF network.' >&2
+   kill -TERM "$network_parent" 2>/dev/null || true
+   return
+  fi
+ done
+}