Refinement: an exception in a trial slot or in RefineModel no longer ends the run

A slot builder thread that throws (gemmi's topology or hydrogen placement, bad_alloc) would
call std::terminate - rugnux or the broker gone. The slot is now left out as one the card
cannot take is, with a warning, and MakeOwnSlot's GPU engine catches std::exception, not only
JFJochException. Both callers of RefineModel (after the merge, and --mode refine) catch
std::exception: the refinement is reported NOT_PERFORMED with "refinement failed: <what>" and
the run writes everything else (cell e.s.d.s, unmerged MTZ, report), as the refinement is
processing-inert.

Test: --mode refine on a cell too large for the bulk-solvent grid comes back with
REFINE= NOT_PERFORMED and the reason, not an exception.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu
(cherry picked from commit dc4e99fe4b3da2a9a3fa4290b5f70bfcc8c7bdb8)

image_analysis/structure_refinement/Refinement.cpp

@@ -998,7 +998,7 @@ std::unique_ptr<OwnSlot> MakeOwnSlot(const gemmi::Structure &before_topology, co
             if (!ctx.engine)
                 return nullptr;
             ctx.scale_gpu = std::make_unique<ModelScaleGPUPool>(device, ctx.refl.Size(), 1);
-        } catch (const JFJochException &) {
+        } catch (const std::exception &) {
             return nullptr;
         }
         ctx.device = device;
@@ -1299,7 +1299,12 @@ RefinementResult RefineModel(const gemmi::Structure &placed, const std::vector<M
 #ifdef JFJOCH_USE_CUDA
             const ScopedGpuPin pin(devices[k] >= 0 ? devices[k] : get_gpu());
 #endif
-            own[k] = MakeOwnSlot(before_topology, ctx, devices[k], slot_threads, settings);
+            // a slot that cannot be made is left out, as where the card cannot take its engine
+            try {
+                own[k] = MakeOwnSlot(before_topology, ctx, devices[k], slot_threads, settings);
+            } catch (const std::exception &e) {
+                logger.Warning("Refinement: a trial slot could not be made ({}), the trials share fewer", e.what());
+            }
         });
 
     RefinePlacement(ctx, settings.group_b, result);