Add ronin-mainnet and ronin-saigon op-reth (OP-stack migration, May 12 2026)

Ronin migrated from standalone sidechain to OP-stack L2 operated by
Conduit, with EigenDA V2 for data availability. New composes follow
conduitxyz/ronin-migration-reth-docker: conduit-op-reth fork +
op-node v1.16.5 + eigenda-proxy 2.7.0 relay.

- op/ronin/{mainnet,saigon}: Conduit genesis (bedrockBlock patched to
  55577500 / 45528550) and rollup.json (alt_da GenericCommitment injected)
- saigon is a NEW chain post-migration: chainid 202601, L1 sepolia
- also regenerated: xlayer-testnet composes (dshackle chain label was
  corrupted to 'ronin' by an override typo), native ronin/ronin composes
  (upstream labels follow new chain ids), reference-rpc-endpoint.json

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

op/ronin/saigon/rollup.json

@@ -0,0 +1,53 @@
+{
+  "genesis": {
+    "l1": {
+      "hash": "0xfa238d945c6c3b3fd4d2ddc8e3aa45e86df6bdb793c72e6fd8ff21282b7fe585",
+      "number": 10199593
+    },
+    "l2": {
+      "hash": "0x193bdc7bc8fe03f5475120db70f2bce1447073196aaa46caa9de1ea700b52727",
+      "number": 45528550
+    },
+    "l2_time": 1770338862,
+    "system_config": {
+      "batcherAddr": "0xd1a409fdd53bd26df2b6e488d358fac88a5bb9d3",
+      "overhead": "0x0000000000000000000000000000000000000000000000000000000000000000",
+      "scalar": "0x010000000000000000000000000000000000000000000000000c3c9d00000558",
+      "gasLimit": 60000000,
+      "eip1559Params": "0x0000000000000000",
+      "operatorFeeParams": "0x0000000000000000000000000000000000000000000000000000000000000000",
+      "minBaseFee": 1000000000,
+      "daFootprintGasScalar": 0
+    }
+  },
+  "block_time": 2,
+  "max_sequencer_drift": 600,
+  "seq_window_size": 3600,
+  "channel_timeout": 300,
+  "l1_chain_id": 11155111,
+  "l2_chain_id": 202601,
+  "regolith_time": 0,
+  "canyon_time": 0,
+  "delta_time": 0,
+  "ecotone_time": 0,
+  "fjord_time": 0,
+  "granite_time": 0,
+  "holocene_time": 0,
+  "isthmus_time": 0,
+  "jovian_time": 0,
+  "batch_inbox_address": "0x00a4d9a78f8d80ff95912a6ace8e870df35bd900",
+  "deposit_contract_address": "0xe8776570681541d5d3fc1f27af7628a775626244",
+  "l1_system_config_address": "0x29f680c13e0d88fc084e2a0462d69978992a1a6e",
+  "protocol_versions_address": "0x8ee497ca36f7b2b8db0474da877bb266a397ac04",
+  "chain_op_config": {
+    "eip1559Elasticity": 6,
+    "eip1559Denominator": 50,
+    "eip1559DenominatorCanyon": 250
+  },
+  "alt_da": {
+    "da_commitment_type": "GenericCommitment",
+    "da_challenge_contract_address": "0x0000000000000000000000000000000000000000",
+    "da_challenge_window": 1,
+    "da_resolve_window": 1
+  }
+}