Phase 1B: Register static XES analysis steps

[lg345]

Parent: #82

Scope

Port the analysis methods used in XESBatchAnalysisRotation.primary_analysis_static to the new registry as stateless, decorated step functions.

Steps to register

Step name	Source method	Description
filter_shots	SpectroscopyAnalysis.filter_shots	Filter shot masks by threshold on a diagnostic key
union_shots	SpectroscopyAnalysis.union_shots	Combine shots across filter masks (AND logic)
separate_shots	SpectroscopyAnalysis.separate_shots	Separate shots by filter exclusion (A AND NOT B)
filter_detector_adu	SpectroscopyAnalysis.filter_detector_adu	Zero pixels below ADU threshold
reduce_detector_shots	SpectroscopyAnalysis.reduce_detector_shots	Sum/reduce detector across shot dimension
reduce_detector_spatial	SpectroscopyAnalysis.reduce_detector_spatial	Apply ROIs and reduce spatial dimension
apply_roi	SpectroscopyAnalysis.apply_roi	Apply ROI mask to detector
rotate	wraps scipy.ndimage.rotate	Rotate detector images by angle
patch_pixels	SpectroscopyAnalysis.patch_pixels	Patch bad detector pixels
hit_finding	HitFinding.basic_detect	Identify and filter on hit events

Key changes from current implementation

• All steps become stateless: no self.pixels_to_patch, no self.adu_cutoff. These come from YAML args.
• Steps read from and write to run.results[key] instead of setattr(run, key, val).
• Dot-separated key convention: union_shots on epix_ROI_1 with filters [simultaneous, laser] writes to run.results["epix_ROI_1.simultaneous_laser"].
• Steps call run.update_status(...) for logging.

Acceptance criteria

• Each step can be called independently with a mock run object and YAML-style kwargs
• Steps produce correct output keys following dot-separated naming convention
• Status logs are written for every step execution