fix: fence ledger outbox claims by instance

tests/application/test_execution_ledger.py

@@ -119,7 +119,11 @@ def _wire(broker, *, ledger=None, clock=None, alarm_emitter=None, ledger_skip_st
     svc = SlotService(repo)
     intents = IntentService(svc, repo, InMemoryIntentStore(),
                             resolve_symbol=lambda pid: "005930")
-    outbox = InMemoryLedgerOutbox(clock=clock) if clock else InMemoryLedgerOutbox()
+    outbox = (
+        InMemoryLedgerOutbox(clock=clock, instance_key="default")
+        if clock
+        else InMemoryLedgerOutbox(instance_key="default")
+    )
     execution = ExecutionService(
         svc,
         repo,
@@ -430,7 +434,7 @@ def test_duplicate_execution_id_results_in_zero_duplicate_in_ledger():
     # And even if the writer somehow re-processes (simulated by a fresh outbox
     # row for the same execution_id, e.g. after a manual replay), the ledger
     # adapter dedup'd it server-side and the outcome is duplicate_completed.
-    replay_outbox = InMemoryLedgerOutbox()
+    replay_outbox = InMemoryLedgerOutbox(instance_key="test-instance")
     replay_writer = LedgerWriter(replay_outbox, ledger)
     replay_outbox.enqueue(first.trade)
     stats = replay_writer.run_once()