fix(k1): restore low-latency live recovery path

tests/test_xgrids_application_session.py

@@ -193,6 +193,7 @@ class FakePhysicalCommandCoordinator:
         self.resolutions: list[tuple[str, str | None]] = []
         self.phase_probe: Callable[[], str] | None = None
         self.snapshot_override: dict[str, object] | None = None
+        self.snapshot_calls = 0
 
     def bind_control_session(self, binding: PhysicalCommandRuntimeBinding) -> None:
         self.bindings.append(binding)
@@ -217,6 +218,7 @@ class FakePhysicalCommandCoordinator:
         self.resolutions.append((f"{action}-not-dispatched", phase))
 
     def snapshot(self) -> dict[str, object]:
+        self.snapshot_calls += 1
         if self.snapshot_override is not None:
             return self.snapshot_override
         return {
@@ -433,6 +435,36 @@ def _successful_start_checkpoint_observer(
     return None
 
 
+def test_control_only_snapshot_reuses_preverified_physical_command() -> None:
+    coordinator = FakePhysicalCommandCoordinator()
+    session = InteractiveApplicationControlSession(
+        FakeAuthorityLoader(),
+        transport_factory=FakeTransport,  # type: ignore[arg-type]
+        physical_command_coordinator=coordinator,  # type: ignore[arg-type]
+    )
+
+    control_only = session.snapshot_control_only()
+    assert control_only["state"] == "idle"
+    assert control_only["physical_command"] is None
+    assert coordinator.snapshot_calls == 0
+
+    verified_physical = {
+        "status": "resolved",
+        "requires_reconciliation": False,
+    }
+    joined = session.snapshot_with_physical_command(verified_physical)
+    assert joined["physical_command"] == verified_physical
+    assert coordinator.snapshot_calls == 0
+
+    regular = session.snapshot()
+    assert regular["physical_command"] == {
+        "status": "test",
+        "requires_reconciliation": False,
+        "automatic_replay_allowed": False,
+    }
+    assert coordinator.snapshot_calls == 1
+
+
 def test_canonical_stages_require_operator_events_but_device_standby_does_not(
     monkeypatch: pytest.MonkeyPatch,
 ) -> None: