fix(k1): admit start after reopened standby

tests/test_xgrids_physical_command_ledger.py

@@ -2142,6 +2142,30 @@ def test_ready_prepared_stop_reset_reopen_accepts_fresh_ready(
         settled
     )
 
+    successor = ledger.prepare(
+        operation_id=NEXT_START_OPERATION,
+        parent_operation_id=STOP_OPERATION,
+        acquisition_id="acquisition-after-reset-fresh-ready",
+        action="start",
+        identity=IDENTITY,
+        connection=fresh_connection,
+        compatibility_profile_id="xgrids-k1-v0.6.0",
+        payload_sha256="8" * 64,
+        baseline_status=_status(
+            "ready",
+            connection=fresh_connection,
+            observed_at="2026-08-14T11:11:01.000Z",
+        ),
+    )
+
+    assert successor.revision == settled.revision + 1
+    assert successor.action == "start"
+    assert successor.stage == "prepared"
+    assert successor.parent_operation_id == STOP_OPERATION
+    assert successor.reconciliations[-1].reconciliation_id == (
+        "prepared-stop-ready-reset-fresh-ready"
+    )
+
 
 def test_scenario_reset_retires_effective_active_prepared_stop_classification(
     tmp_path: Path,