把摄像头协商结果记进 session.json，并在达不到配置帧率时明说 - What: sdk_worker 新增 capture_status_of(sensor)（把采集源的 config 与 status 合成 {requested:{width,height,fps,fourcc}, negotiated:{width,height,fps,fourcc,backend}, dropped_frames}）与 short_capture_fallacy(status)（当协商帧率低于申请值 90% 时给出一句话描述，含分辨率/实际帧率/申请帧率/格式/后端；两者都齐全时才说话）；两个 worker 都加 capture_status() 访问器（box 取当前 sensor，finger 取 runtime.tactile.raw_sensor）。app_window：session.json 新增顶层 capture 块（_capture_metadata()，走同一个访问器）；新增 _check_capture_negotiation()——每个会话在驱动第一次报出速率后检查一次，达不到就通过 _notify 明确提示（不是每帧刷屏），新键 status.capture_slow（中英）写明"软件改不了、记录按实际帧率保存、请降分辨率/换格式或换摄像头"。tests/test_worker_frame_rate.py：假设备补上 CaptureConfig 与 CaptureStatus 的 width/height/fps/fourcc/backend_name 字段，新增 test_a_low_camera_rate_is_recorded_as_a_negotiation（1920x1080、申请 30、协商 16.67 时 capture_status() 两半都在、描述里含 1920x1080/16.67/30；协商到位时描述为空串）。 - Why: 用户按上一轮的读数报告"还是摄像头 16.7"，即摄像头自身只发布 16.7 —— 这排除了流水线（每帧只 12 ms）与应用侧节拍，剩下的只能是采集格式协商：配置申请的是 resolution_raw 1920x1080 @ 30 fps（fourcc 走 CaptureConfig 默认 MJPG）。这类"驱动只提供这个格式"的情况软件无法改变，但记录里必须留下证据、操作员必须被告知，否则一个 16.7 的采集和一次正常的 30 fps 采集在文件里长得一样，事后再也无法解释。 - Verification: shared 全量 161 passed（新增 1 项）；studio 90 passed；ui_check 554 项检查 0 失败；locale_check 287 字面键全部命中、中英键集一致（343+1=344? 见下方键数）。 - Not in this change: 未改 SDK 的采集参数（仍是 1920x1080/30/MJPG、后端 auto）；frames.csv 仍未记录 process_ms/capture_fps（下次改记录格式时一并加）；未做自动降级（例如检测到 16.7 就自动改用更低分辨率）——那会改变传感器几何，必须由人决定。

shared/tests/test_worker_frame_rate.py

@@ -31,6 +31,23 @@ class _Status:
     def __init__(self) -> None:
         self.last_seq = 0
         self.dropped_frames = 0
+        #: What the driver reported back for the negotiated stream.
+        self.width = 1920
+        self.height = 1080
+        self.fps = 30.0
+        self.fourcc = "MJPG"
+        self.backend_name = "MSMF"
+
+
+class _CaptureConfig:
+    """The requested stream, as ``CaptureConfig`` carries it."""
+
+    def __init__(self) -> None:
+        self.width = 1920
+        self.height = 1080
+        self.fps = 30.0
+        self.fourcc = "MJPG"
+        self.source = 0
 
 
 class _CaptureSource:
@@ -45,6 +62,7 @@ class _CaptureSource:
 
     def __init__(self, period_s: float = FRAME_PERIOD_S) -> None:
         self.status = _Status()
+        self.config = _CaptureConfig()
         self.running = True
         self._period = float(period_s)
         self._stop = threading.Event()
@@ -265,6 +283,45 @@ def test_the_camera_s_own_rate_is_reported_next_to_ours(monkeypatch):
         monkeypatch.setattr(sys.modules[__name__], "PROCESS_COST_S", 0.0)
 
 
+def test_a_low_camera_rate_is_recorded_as_a_negotiation(monkeypatch):
+    """A camera that cannot do the configured rate must be visible as such.
+
+    The pipeline cannot turn 16.7 fps into 30, so the only honest thing left is to
+    record what was asked for and what the driver gave, and to have a one-line
+    description ready for the operator.
+    """
+    from orisys_app_shared.acquisition.sdk_worker import (
+        SdkAcquisitionWorker,
+        short_capture_fallacy,
+    )
+
+    CREATED.clear()
+    saved = _install()
+    worker = SdkAcquisitionWorker()
+    try:
+        worker.start(0, config_ref=BOX_CONFIG)
+        deadline = time.perf_counter() + 2.0
+        while time.perf_counter() < deadline and not CREATED:
+            time.sleep(0.01)
+        assert CREATED, "the fake sensor was never constructed"
+        source = CREATED[-1].capture_source
+        source.status.fps = 16.67  # what the driver actually negotiated
+        status = worker.capture_status()
+        assert status["requested"]["fps"] == 30.0
+        assert status["requested"]["width"] == 1920
+        assert status["negotiated"]["fps"] == 16.67, status
+        assert status["negotiated"]["fourcc"] == "MJPG"
+        assert status["negotiated"]["backend"] == "MSMF"
+        detail = short_capture_fallacy(status)
+        assert "1920x1080" in detail and "16.67" in detail and "30" in detail, detail
+        # A driver that gives what was asked for says nothing at all.
+        source.status.fps = 30.0
+        assert short_capture_fallacy(worker.capture_status()) == ""
+    finally:
+        worker.stop(wait=True)
+        _restore(saved)
+
+
 def test_a_file_source_runs_on_the_video_s_own_timeline():
     """A pass over a video is stamped with the video's time, not the wall clock."""
     from orisys_app_shared.acquisition.sdk_worker import SdkAcquisitionWorker