完善 Autocal 多测点标定流程及会话复核

统一测点坐标、保持窗口和试验目录，补齐逐点初步分析。定向测试与真实视频闭环通过；两项轮询失败在修改前版本同样复现。

shared/tests/test_experiment_recorder.py

@@ -288,3 +288,39 @@ if __name__ == "__main__":  # pragma: no cover - manual runner
             print(f"  FAIL {name}: {type(exc).__name__}: {exc}")
     print(f"failures: {failures}")
     raise SystemExit(1 if failures else 0)
+
+
+def test_named_trial_directory_is_safe_and_never_overwritten(tmp_path):
+    recorder = ExperimentRecorder(RecordConfig(video=False))
+    for value in ("../trial", "a/b", "..", "C:\\trial"):
+        with pytest.raises(ValueError):
+            recorder.start(root=tmp_path, session_id=1, metadata={}, directory_name=value)
+    directory = recorder.start(root=tmp_path, session_id=1, metadata={}, directory_name="trial-001")
+    recorder.on_packet(_packet(0))
+    recorder.stop(wait=True)
+    assert directory == tmp_path / "trial-001"
+    with pytest.raises(FileExistsError):
+        recorder.start(root=tmp_path, session_id=1, metadata={}, directory_name="trial-001")
+    assert (directory / "session.json").is_file()
+
+
+@pytest.mark.parametrize("preserve", [False, True])
+def test_calibration_can_keep_burst_frames_without_changing_default_pacing(tmp_path, preserve):
+    from dataclasses import replace
+
+    recorder = ExperimentRecorder(RecordConfig(fps=30, preserve_all_frames=preserve))
+    directory = recorder.start(root=tmp_path, session_id=1, metadata={})
+    for index in range(10):
+        recorder.on_packet(replace(_packet(index), mono_t=index / 300.0))
+    report = recorder.stop(wait=True)
+    assert report.stats.frames == 10
+    if preserve:
+        assert report.stats.video_frames == 10
+        assert report.stats.resampled_video == 0
+        assert report.ok
+    else:
+        assert report.stats.video_frames < 10
+        assert report.stats.resampled_video > 0
+    with (directory / "frames.csv").open(encoding="utf-8") as handle:
+        rows = list(csv.DictReader(handle))
+    assert sum(row["in_video"] == "1" for row in rows) == report.stats.video_frames