Sync workspace: config, docs, scripts, CI, operator rules, and submodule pointers.

- Update dbis_core, cross-chain-pmm-lps, explorer-monorepo, metamask-integration, pr-workspace/chains
- Omit embedded publish git dirs and empty placeholders from index

Made-with: Cursor

config/op-stack-superchain/op-stack-l2.example.env

@@ -0,0 +1,16 @@
+# OP Stack L2 operator env (example — copy to deployed/op-stack-l2.env or host path; do not commit secrets)
+#
+# L2 chain ID: MUST be distinct from Besu DBIS Chain 138 (138). Choose a registered-unique ID per superchain-registry / chainlist policy.
+# OP_STACK_L2_CHAIN_ID=
+
+# Ethereum L1 (mainnet or Sepolia rehearsal)
+# ETH_MAINNET_RPC_URL=https://eth.llamarpc.com
+# ETH_SEPOLIA_RPC_URL=https://rpc.sepolia.org
+
+# L2 sequencer / replica RPC (your infra)
+# OP_STACK_L2_RPC_URL=http://127.0.0.1:8545
+
+# Deployer / batcher / proposer (use separate keys in production; never commit private keys)
+# DEPLOYER_PRIVATE_KEY=
+# BATCHER_PRIVATE_KEY=
+# PROPOSER_PRIVATE_KEY=