slug resolution: derive from dRPC chains.yaml, no in-code name heuristics

Regenerated by the expand_config.py redesign (see vibe-node commit). Slug
corrections, each verified present in chains.yaml:
  soneium-minato-sepolia x5: soneium (MAINNET!) -> soneium-minato
  avalanche-fuji x5:         avalanche (MAINNET!) -> avalanche-fuji
  thundercore-venus:         thundercore (MAINNET!) -> thundercore-testnet
  core-pigeon:               core-pigeon -> core-testnet
  zircuit-garfield:          zircuit-testnet -> zircuit-garfield-testnet
  sonic-testnet x2:          sonic-testnet -> sonic-testnet-v2
  ronin-saigon x3:           (none) -> ronin-saigon
  everclear-sepolia x2:      dropped (chain shut down 2026-06-05)
fuse-spark x3 (hand-written, fuse has chains: null in context.yml): x-upstreams
REMOVED - Sparknet is absent from chains.yaml; it declared the mainnet slug.

Verified: 310 testnet composes, 0 wrong-slug failures (was 22); 0 mainnet
composes carrying a testnet slug; 0 mainnet slug changes.

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

op/geth/soneium-miniato-sepolia-op-geth-archive-leveldb-hash.yml

@@ -55,7 +55,7 @@ services:
     environment:
       - GETH_OP_NETWORK=soneium-miniato-sepolia
       - GETH_ROLLUP_DISABLETXPOOLGOSSIP=true
-      - GETH_ROLLUP_SEQUENCERHTTP=https://rpc.soneium.org
+      - GETH_ROLLUP_SEQUENCERHTTP=https://rpc.minato.soneium.org
     entrypoint: /bin/sh -c 'exec geth "$@"' --
     command:
       - --datadir=/data
@@ -176,7 +176,7 @@ x-upstreams:
           frameSize: 20Mb
           msgSize: 50Mb
           url: $${WS_URL}
-    chain: soneium
+    chain: soneium-minato
     method-groups:
       enabled:
         - debug