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>

reference-rpc-endpoint.json

@@ -3442,6 +3442,7 @@
     "lagging_lag": 20,
     "syncing_lag": 40,
     "urls": [
+      "https://rpc.tea.xyz",
       "https://tea.drpc.org"
     ]
   },