common: expose the run-summed azimuthal profile object

Belongs with the previous commit - powder calibration reads the ring positions
off the accumulated profile, and without this accessor rugnux/Rugnux.cpp does not
compile. It was left out of that commit by a staging mistake, not by intent.

GetAzIntProfile() flattens the profile to an array; the calibration wants the
object's own GetResult(), which leaves a bin no pixel fell in as NaN. Flattened to
zero, such a bin reads as a deep hole in the ring rather than as no measurement.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

common/JFJochReceiverPlots.h

@@ -129,6 +129,11 @@ public:
     std::vector<float> GetIceRingScoreArray() const;
 
     std::vector<float> GetAzIntProfile() const;
+    // The run-summed profile object itself, rather than the array GetAzIntProfile() flattens it to.
+    // Powder calibration reads the ring positions off it and wants its own GetResult(), which leaves a
+    // bin no pixel fell in as NaN - as 0 it would read as a deep hole in the ring instead. Null before
+    // Setup(); not synchronised, so use it once the run is over rather than while images arrive.
+    [[nodiscard]] const AzimuthalIntegrationProfile *GetAzIntProfileObject() const { return az_int_profile.get(); }
     MultiLinePlot GetAzIntProfilePlot(bool force_1d = false, PlotAzintUnit azint_unit = PlotAzintUnit::Q_recipA) const;
 
     MeanProcessingTime GetMeanProcessingTime() const;