Add op-reth variants: unichain-mainnet, hashkey mainnet+testnet (Superchain op-geth->reth migration); add hashkey mainnet config (chainid 177, mainnet.hsk.xyz) which also fixes the previously-empty geth/erigon mainnet composes

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

compose_registry.json

@@ -6174,6 +6174,38 @@
       "bob-sepolia-op-reth-pruned-trace"
     ]
   },
+  {
+    "chain": "mainnet",
+    "client": "reth",
+    "compose_file": "op/reth/hashkeychain-mainnet-op-reth-pruned-trace",
+    "features": [
+      "trace"
+    ],
+    "network": "hashkeychain",
+    "node": "node",
+    "relay": null,
+    "stack": "op",
+    "type": "pruned",
+    "volumes": [
+      "hashkeychain-mainnet-op-reth-pruned-trace"
+    ]
+  },
+  {
+    "chain": "testnet",
+    "client": "reth",
+    "compose_file": "op/reth/hashkeychain-testnet-op-reth-pruned-trace",
+    "features": [
+      "trace"
+    ],
+    "network": "hashkeychain",
+    "node": "node",
+    "relay": null,
+    "stack": "op",
+    "type": "pruned",
+    "volumes": [
+      "hashkeychain-testnet-op-reth-pruned-trace"
+    ]
+  },
   {
     "chain": "sepolia",
     "client": "reth",
@@ -6465,6 +6497,22 @@
       "soneium-minato-sepolia-op-reth-pruned-trace"
     ]
   },
+  {
+    "chain": "mainnet",
+    "client": "reth",
+    "compose_file": "op/reth/unichain-mainnet-op-reth-pruned-trace",
+    "features": [
+      "trace"
+    ],
+    "network": "unichain",
+    "node": "node",
+    "relay": null,
+    "stack": "op",
+    "type": "pruned",
+    "volumes": [
+      "unichain-mainnet-op-reth-pruned-trace"
+    ]
+  },
   {
     "chain": "sepolia",
     "client": "reth",