为采集帧绑定主机时间与来源信息

采集时间随图像穿过处理队列，并修正未读帧的丢帧计数。通过采集与流水线针对性测试。

src/orisys/finger/runtime.py

@@ -358,6 +358,14 @@ class FingerRuntime:
             return self.capture_source.read_raw()
         return self.capture.read()
 
+    def read_source_stamped(self):
+        """Read the source image with its capture-thread identity and host clocks."""
+        if self.capture_source is None:
+            return None
+        if self.capture_source.running:
+            return self.capture_source.read_latest_stamped(copy=True, wait_s=1.0)
+        return self.capture_source.read_raw_stamped()
+
     def process_frame(self, frame, *, color=False):
         """Prepare, unroll, and feed one source frame into the tactile processor."""
         if color: