Add hemi sepolia (testnet, chain 743111): op-geth pruned variant

hemi-testnet US-Central market $6/day with 2 providers. BTC side =
testnet3 (own hVM genesis @3522419), L1 = ethereum sepolia, snap sync,
genesis+rollup checked in per hemi-node testnet dir, fork overrides in
env/op/hemi/sepolia/.

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

op/hemi/sepolia/rollup.json

@@ -0,0 +1,35 @@
+{
+  "genesis": {
+    "l1": {
+      "hash": "0xba3af4dc71b531ec9dac0c069cf398996bfe4ca958573c9a45ef05841ce18ace",
+      "number": 5302554
+    },
+    "l2": {
+      "hash": "0xc7eef424ae7c339cd0896344c80e136b81246ec5fe7d91a668a09b4c17543194",
+      "number": 0
+    },
+    "l2_time": 1708110816,
+    "system_config": {
+      "batcherAddr": "0x0632215e32658508fc985bb80f22ee71377f7aae",
+      "overhead": "0x0000000000000000000000000000000000000000000000000000000000000834",
+      "scalar": "0x00000000000000000000000000000000000000000000000000000000000f4240",
+      "gasLimit": 30000000
+    }
+  },
+  "block_time": 12,
+  "max_sequencer_drift": 600,
+  "seq_window_size": 3600,
+  "channel_timeout": 300,
+  "l1_chain_id": 11155111,
+  "l2_chain_id": 743111,
+  "regolith_time": 0,
+  "batch_inbox_address": "0xff00000000000000000000000000000000743111",
+  "deposit_contract_address": "0xb6f9579980ae46f61217a99145645341e49e2516",
+  "l1_system_config_address": "0xfa73580f4d72294ae9ee3daac36d8bf111b37ce9",
+  "protocol_versions_address": "0x0000000000000000000000000000000000000000",
+  "chain_op_config": {
+    "eip1559Elasticity": 6,
+    "eip1559Denominator": 50,
+    "eip1559DenominatorCanyon": 250
+  }
+}