fix dshackle chain labels: hoodi, rootstock-testnet, ronin-saigon + registry refresh drift

- ethereum-hoodi composes: chain ethereum -> hoodi (was mislabeled as mainnet)
- rootstock-bamboo: chain rootstock -> rootstock-testnet
- ronin-saigon op-reth: empty chain -> ronin-saigon (fresh DRPC registry now
  carries saigon at chainid 202601; stale local upstreams.yml had dropped it)
- assorted regen drift from fresh chain registry

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

ethereum/geth/ethereum-hoodi-geth-pruned-pebble-path--nimbus.yml

@@ -162,7 +162,7 @@ x-upstreams:
           frameSize: 20Mb
           msgSize: 50Mb
           url: $${WS_URL}
-    chain: ethereum
+    chain: hoodi
     method-groups:
       enabled:
         - debug

ethereum/geth/ethereum-hoodi-geth-pruned-pebble-path.yml

@@ -163,7 +163,7 @@ x-upstreams:
           frameSize: 20Mb
           msgSize: 50Mb
           url: $${WS_URL}
-    chain: ethereum
+    chain: hoodi
     method-groups:
       enabled:
         - debug