bramp / build-along / 19843573874

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refactor: Rename SubStep to SubAssembly and improve classification

Terminology change:
- Rename SubStep → SubAssembly (class, config, classifier, fields)
- Rename substeps → subassemblies in Step class
- Update classifier label from 'substep' to 'subassembly'

SubAssembly detection improvements:
- Add configurable minimum size based on Part dimensions
- Move duplicate bbox filtering from StepClassifier to SubAssemblyClassifier
- Add found_bboxes tracking to skip similar bboxes early

Block filtering:
- Preserve visually different blocks even with similar bboxes
- Add _blocks_visually_similar() helper for image comparison

Diagram cleanup:
- Remove arrows field (arrows are now stored in Step)

Update fixture files for new field names and improved detection.

136 of 141 new or added lines in 10 files covered. (96.45%)

10152 of 11223 relevant lines covered (90.46%)

0.9 hits per line