fix(replay): guard single in-flight dispatch

Add a private in-flight helper for replay dispatch, block machine retargeting while an action is still pending on the previous session, and warn on duplicate in-flight entries for the same replay triplet.

Freeze the Notepad runtime dialog success path and add integration coverage for single in-flight dispatch, watchdog late-report documentation, and the known concurrent-poll race as an xfail.

tests/unit/test_executor_verify_window_guard.py

@@ -391,6 +391,8 @@ class TestSetupActionsSkipPixelChange:
 class TestRuntimeDialogHandling:
     def test_handle_confirm_save_dialog_clicks_oui_via_server(self):
         exe = _make_executor_skeleton()
+        exe._active_window_rect_for_dialog = MagicMock(return_value=None)
+        exe._try_click_runtime_dialog_button_uia = MagicMock(return_value=None)
         exe._capture_screenshot_b64 = MagicMock(return_value="abc")
         exe._server_resolve_target = MagicMock(
             return_value={
@@ -403,6 +405,7 @@ class TestRuntimeDialogHandling:
         )
         exe._find_text_on_screen = MagicMock(return_value=None)
         exe._click = MagicMock()
+        exe._wait_until_title_changes = MagicMock(return_value="Enregistrer sous")
 
         spec = ActionExecutorV1._match_known_runtime_dialog(
             "Confirmer l'enregistrement"
@@ -418,6 +421,22 @@ class TestRuntimeDialogHandling:
         exe._server_resolve_target.assert_called_once()
         exe._click.assert_called_once_with((480, 810), "left")
 
+    def test_confirm_save_geometry_fallback_targets_yes_button_in_active_window(self):
+        exe = _make_executor_skeleton()
+        spec = ActionExecutorV1._match_known_runtime_dialog(
+            "Confirmer l'enregistrement"
+        )
+        rect = {
+            "left": 1000,
+            "top": 600,
+            "width": 520,
+            "height": 200,
+        }
+
+        pos = exe._runtime_dialog_button_geometry_fallback(spec, "Oui", rect)
+
+        assert pos == (1338, 764)
+
     def test_runtime_dialog_before_pause_returns_skip_result(self):
         exe = _make_executor_skeleton()
         exe._check_and_pause_on_system_dialog = MagicMock(return_value=False)
@@ -491,6 +510,60 @@ class TestRuntimeDialogHandling:
         assert res["actual_position"] == {"x_pct": 0.5, "y_pct": 0.5}
         exe._handle_known_runtime_dialog.assert_called_once()
 
+    def test_live_notepad_confirm_save_dialog_is_frozen_offline(self):
+        exe = _make_executor_skeleton()
+        exe._click = MagicMock()
+        exe._quick_screenshot_hash = MagicMock(return_value="hash_before")
+        exe._wait_for_screen_change = MagicMock(return_value=True)
+        exe._capture_human_correction = MagicMock(return_value=[])
+        exe._handle_known_runtime_dialog = MagicMock(
+            return_value={
+                "handled": True,
+                "button_text": "Oui",
+                "x_pct": 0.63,
+                "y_pct": 0.76,
+                "resolution_score": 0.9,
+                "post_title": "http192.168.1.408765dossier.htmlid=.txt - Bloc-notes",
+            }
+        )
+
+        action = {
+            "action_id": "act_raw_a8dbaaac",
+            "type": "click",
+            "x_pct": 0.5,
+            "y_pct": 0.5,
+            "expected_window_title": (
+                "http192.168.1.408765dossier.htmlid=.txt - Bloc-notes"
+            ),
+        }
+
+        titles = iter(
+            [
+                {"title": "Confirmer l'enregistrement"},
+                {"title": "http192.168.1.408765dossier.htmlid=.txt - Bloc-notes"},
+            ]
+        )
+
+        with patch("agent_v0.agent_v1.core.executor.time.sleep", lambda *_a, **_k: None):
+            with patch(
+                "agent_v0.agent_v1.window_info_crossplatform.get_active_window_info",
+                side_effect=lambda: next(titles),
+            ):
+                res = exe.execute_replay_action(action)
+
+        assert res["success"] is True
+        assert res["warning"] == "runtime_dialog_handled_post_verify"
+        assert res["action_id"] == "act_raw_a8dbaaac"
+        assert res.get("needs_human") is not True
+        assert "correction" not in res
+        assert res["runtime_dialog"] == {
+            "dialog_id": "confirm_save_overwrite",
+            "dialog_title": "Confirmer l'enregistrement",
+            "button_text": "Oui",
+        }
+        exe._handle_known_runtime_dialog.assert_called_once()
+        exe._capture_human_correction.assert_not_called()
+
     def test_post_verify_can_retry_same_runtime_dialog_before_recovery(self):
         exe = _make_executor_skeleton()
         exe._click = MagicMock()