Stills: kept overloads go back to the drop where they are not concentrated at low resolution

Saturation clips the strongest spots, and those are at low resolution. On a Rayonix stills set the
saturated pixels sat almost entirely past 4 A (0.002% of the reflections coarser than 4 A against
0.59% overall) - flagged or hot pixels, not clipped spots - and keeping those observations as lower
bounds put the saturation limit into high-resolution intensities: R_split 0.12 -> 0.93, CC1/2 0.99
-> 0.33. The run now keeps overloads only where their share coarser than 4 A is at least 1.5x their
overall share; otherwise they are flagged and dropped as before, with a log line saying so.

On clipped CCD stills the share coarser than 4 A is 2.6-5.9x the overall one and nothing changes
(R_split and R_free identical); on the Rayonix set R_split returns to 0.12. A pragmatic gate until
saturation is told from bad pixels per spot. Rotation never keeps overloads and is unaffected.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu

image_analysis/bragg_integration/BraggIntegrationEngine.cpp

@@ -288,6 +288,7 @@ std::vector<Reflection> BraggIntegrationEngine::Finalize(const std::vector<Refle
             refl.I = fr.I + static_cast<float>(fr.saturated * (saturation_limit - fr.bkg));
             refl.sigma = std::sqrt(fr.var_bkg + std::max(refl.I, 1.0f));
             refl.overloaded = false;
+            refl.overload_kept = true;
             ++counts.overloads_kept;
         }
         refl.observed = true;