(FEAT)[Enhanced Results Widget]: Integrate advanced probability breakdown, QC, and provenance export

(FEAT/DATASETS)[Demo Dataset Generation Script for ML Training]: Automate creation of synthetic polymer spectra for stable and weathered classes

(FEAT)[CLI Tool]: Add multi-model inference, format detection, and flexible output

(SYNC): bring parity backend (utils/ scripts/ models/ tests/) from feat/ui-parity-rebuild; no UI changes

(feat): add ResNet18Vision (1D); register; inference --arch supports it

(chore): unify model selection via shared registry (train uses 'choices()'/'build()')

(chore): pre-flight hardening for model expansion (seeds, typo, diagnostics, dtypes, optional deterministic cuDNN)

(fix): ensure parent directory exists before saving output file

Initial migration from original polymer_project