fix: use admin_addPeer for op-geth peer reconciliation

op-geth does not support admin_addStaticPeer; classify op-geth via
compose path (admin_nodeInfo often still says Geth) and fall back on
go-ethereum-style "does not exist/is not available" errors so reinject
and connect-peers restore peers (e.g. hashkey-mainnet).

peer-reinject.sh

@@ -1,7 +1,8 @@
 #!/bin/bash
 # peer-reinject.sh — generic .after-start hook: re-seed peers from peer-capture state.
-# Uses admin_addStaticPeer for geth, admin_addPeer otherwise (connect-peers.sh).
-# In-network vantage (rpc_chains). Idempotent; best-effort (never fails the restart).
+# Uses admin_addStaticPeer for vanilla geth, admin_addPeer for op-geth and others
+# (connect-peers.sh). In-network vantage (rpc_chains). Idempotent; best-effort
+# (never fails the restart).
 #
 # Seed order (one path for us and customers):
 #   1. Own persisted peerset (peer-state/<compose>.json from peer-capture)
@@ -68,6 +69,12 @@ if [ "${#ENODES[@]}" -eq 0 ]; then
     exit 0
 fi
 
+# op-geth lacks admin_addStaticPeer; compose path wins over stale capture state
+# that classified the node as plain "geth" (admin_nodeInfo often still says Geth).
+case "$COMPOSE_PATH" in
+    *op-geth*) CLIENT_TYPE="op-geth" ;;
+esac
+
 BASE="$(basename "$COMPOSE_PATH" | sed 's/--.*//')"
 EL=""
 # wait briefly for container after recreate
@@ -120,6 +127,7 @@ done
 add_peer() {
     local enode="$1"
     local method
+    # Only vanilla geth supports admin_addStaticPeer; op-geth must use admin_addPeer
     if [ "$CLIENT_TYPE" = "geth" ]; then
         method="admin_addStaticPeer"
     else
@@ -132,7 +140,8 @@ add_peer() {
     resp="$(docker exec peer-hook-probe curl -s --max-time 8 -X POST \
         -H 'Content-Type: application/json' --data "$payload" \
         "http://${IP}:8545" 2>/dev/null || true)"
-    if echo "$resp" | grep -qi 'method not found'; then
+    # go-ethereum-style: "the method X does not exist/is not available" (not "method not found")
+    if echo "$resp" | grep -qiE 'method not found|does not exist|not available|-32601'; then
         if [ "$method" = "admin_addStaticPeer" ]; then
             method="admin_addPeer"
         else