zircuit: add jovian_time + karst_time (garfield PAST jovian 1787761801/karst 1788883201; mainnet jovian 1789489801/karst 1790179201) from live sequencers

garfield forked at Jovian (2026-08-26, ~block 23712660) on rpc-de-11 because rollup.json/genesis.json stopped at Isthmus; the de-32 bench copy restored from Conduit's snapshot cannot parse post-Jovian L1-info deposits (data is unexpected length: 178) for the same reason. mainnet activates Jovian 2026-09-15 and Karst 2026-09-23.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RzxemENdcZBCxdGrzXiFvS

op/zircuit/garfield/genesis.json

@@ -32,7 +32,9 @@
       "eip1559Elasticity": 6,
       "eip1559Denominator": 50,
       "eip1559DenominatorCanyon": 250
-    }
+    },
+    "jovianTime": 1787761801,
+    "karstTime": 1788883201
   },
   "nonce": "0x0",
   "timestamp": "0x67bb6d60",

op/zircuit/garfield/rollup.json

@@ -40,5 +40,7 @@
     "eip1559Elasticity": 6,
     "eip1559Denominator": 50,
     "eip1559DenominatorCanyon": 250
-  }
+  },
+  "jovian_time": 1787761801,
+  "karst_time": 1788883201
 }

op/zircuit/mainnet/genesis.json

@@ -32,7 +32,9 @@
       "eip1559Elasticity": 6,
       "eip1559Denominator": 50,
       "eip1559DenominatorCanyon": 250
-    }
+    },
+    "jovianTime": 1789489801,
+    "karstTime": 1790179201
   },
   "nonce": "0x0",
   "timestamp": "0x668424d7",

op/zircuit/mainnet/rollup.json

@@ -40,5 +40,7 @@
     "eip1559Elasticity": 6,
     "eip1559Denominator": 50,
     "eip1559DenominatorCanyon": 250
-  }
+  },
+  "jovian_time": 1789489801,
+  "karst_time": 1790179201
 }