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Foundation for making processing a first-class GUI activity: - process/JFJochProcessCommandLine: reconstruct the equivalent jfjoch_process / jfjoch_azint command line from a ProcessConfig + DiffractionExperiment + input path, for handing a job off to a cluster. Unit-tested (full + azint). - viewer/JFJochProcessController: runs one JFJochProcess job off the GUI thread (its own private reader; HDF5 access is globally serialized so it is safe next to the interactive reader) and reports back via queued Qt signals (started/phaseChanged/progress/finished/failed). Cancel() forwards to JFJochProcess::Cancel(). Progress is throttled to ~200 updates per run. The visible processing UI (jobs window + snapshot switcher + converged settings) builds on this. Verified: tests/jfjoch_test [process]; jfjoch_viewer links and builds against JFJochProcess. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>