op-reth sepolia fixes: superseed Jovian fork times, Karst v2.3.1 bump, op-sepolia/soneium template fixes

- superseed-sepolia: add holocene/isthmus/jovian fork times to rollup.json (CL)
  and genesis.json (EL). jovian_time=1768978801 is superseed's chain-specific
  activation (verified live via sepolia.superseed.xyz optimism_rollupConfig);
  the official superseed-xyz/node repo + the old committed config both lacked it,
  causing op-node "failed to parse L1 info deposit tx ... unexpected length: 178".
- op-reth v2.3.0 -> v2.3.1 across all op-reth composes (Karst-mandatory release,
  Sepolia activation Jun 17 2026 16:00 UTC).
- op-sepolia: --chain=optimismsepolia -> optimism-sepolia (invalid chain spec
  prevented op-reth from starting).
- soneium-minato-sepolia (reth/geth/erigon): L1 upstream vars now resolve to
  ETHEREUM_SEPOLIA_* (were ETHEREUM_MINATO-SEPOLIA_*, nonexistent -> no L1 RPC);
  state-cache shell var de-hyphenated; pectra blob-schedule override now emitted.

NOTE: superseed karst_time not yet published by the chain; must be added before
Jun 17 2026 once superseed announces it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

op/reth/xlayer-testnet-op-reth-pruned-trace.yml

@@ -46,7 +46,7 @@ services:
     logging: *logging-defaults
 
   xlayer-testnet-op-reth-pruned:
-    image: ${XLAYER_RETH_IMAGE:-us-docker.pkg.dev/oplabs-tools-artifacts/images/op-reth}:${XLAYER_TESTNET_RETH_VERSION:-v2.3.0}
+    image: ${XLAYER_RETH_IMAGE:-us-docker.pkg.dev/oplabs-tools-artifacts/images/op-reth}:${XLAYER_TESTNET_RETH_VERSION:-v2.3.1}
     sysctls:
       # TCP Performance
       net.ipv4.tcp_slow_start_after_idle: 0       # Disable slow start after idle