op-stack EL: publish p2p port + keep discovery on for node_sync nodes (49 composes)

Operator decision 2026-10-04 (sebastian): consensus-layer-synced op-stack nodes used to run
with --nodiscover / --disable-discovery and no published p2p port. A 0-peer EL can never
backfill a dropped-gossip gap, so op-node wedges in FCU-SYNCING until L1 derivation
catches up (katana 09-19..26, zircuit, mode). Blocks still arrive only via op-node; EL
peers are for gap-fill. Our own copies now discover each other implicitly.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RzxemENdcZBCxdGrzXiFvS

op/geth/fraxtal-testnet-op-geth-pruned-pebble-path.yml

@@ -45,6 +45,9 @@ services:
     ulimits:
       nofile: 1048576    # Max open files (for RPC/WS connections)
     user: root
+    ports:
+      - 11370:11370
+      - 11370:11370/udp
     expose:
       - 8545
       - 6060
@@ -61,6 +64,7 @@ services:
       - GETH_ROLLUP_SEQUENCERHTTP=https://rpc.testnet.frax.com
     entrypoint: /bin/sh -c '[ -f /config/genesis.json ] && geth --db.engine=pebble --gcmode=full --datadir /data init --state.scheme=path /config/genesis.json; [ -f /config/static-nodes.json ] && cp -f /config/static-nodes.json /data/static-nodes.json; exec geth "$@"' --
     command:
+      - --bootnodes=enr:-KO4QFOGWnVckCqXKTpKAPU_AZJmIbRjz8PTwPjkLgKJ9H_1bQT3fx57hU5OWeBqoLJ4Wa_VfA4paKQ_O-l7CJxj8ECGAZoNhOM7g2V0aMfGhGTaoWCAgmlkgnY0gmlwhCigGzaJc2VjcDI1NmsxoQJHFjvlp9CAbQ-YbO-QglEnykeVDLW8chF72qYUhax0T4RzbmFwwIN0Y3CCdmKDdWRwgnZi,enr:-KO4QCRQ8XyyqzjjYV2NcGWNc6R-kaMhp8KyYw-8mxoGbHsvUbBCO2H8f7PjtDE_ce85nSfcnVgHzfiqhpLvl5aSONWGAZoNdAX-g2V0aMfGhGTaoWCAgmlkgnY0gmlwhA_MbmOJc2VjcDI1NmsxoQO0Z6xvk6FhoaOAiEfRYHfjD5iBD-l0DFSn61-Y2Rf6VYRzbmFwwIN0Y3CCdmKDdWRwgnZi
       - --datadir=/data
       - --db.engine=pebble
       - --gcmode=full
@@ -68,8 +72,9 @@ services:
       - --metrics
       - --metrics.addr=0.0.0.0
       - --metrics.port=6060
+      - --nat=extip:${IP}
       - --networkid=2523
-      - --nodiscover
+      - --port=11370
       - --rpc.gascap=600000000
       - --rpc.txfeecap=0
       - --state.scheme=path