feat(lab): add recorded realtime spatial playback

src/k1link/perception/geometry.py

@@ -257,6 +257,25 @@ class RecordedGeometryStore:
         points.setflags(write=False)
         return points
 
+    def current_points_for_frame(self, frame_index: int) -> FloatArray | None:
+        """Expose one verified increment to a read-only recorded-evidence projector."""
+
+        if not isinstance(frame_index, int) or isinstance(frame_index, bool):
+            raise GeometryProviderError("replay evidence frame index is invalid")
+        if not 0 <= frame_index < self.profile.frame_count:
+            raise GeometryProviderError("replay evidence frame is outside the source profile")
+        if int(self._source["frame_indices"][frame_index]) != frame_index:
+            raise GeometryProviderError("source pack frame sequence changed")
+        if not bool(self._source["sample_available"][frame_index]) or not bool(
+            self._surface["frame_valid"][frame_index]
+        ):
+            return None
+        offsets = self._source["cloud_offsets"]
+        start, end = int(offsets[frame_index]), int(offsets[frame_index + 1])
+        points = np.asarray(self._source["cloud_points_map"][start:end], dtype=np.float64)
+        points.setflags(write=False)
+        return points
+
     def pose_values_for_frame(
         self,
         frame_id: str,