Missing features from peprs

peprs-py does not support:

• defer_samples_creation — samples always load eagerly [Won’t be implemented]
• activate_amendments() / deactivate_amendments() / list_amendments — amendments are constructor-only
• sample_table property (use to_polars() / to_pandas() instead)
• subsample_table property (subsamples only via to_dict(raw=True))
• sample_name_colname property
• Project() with no args (empty project)
• Sample objects (samples are plain dicts, not Sample instances)
• Pickle support [We don't need this functionality ]
• from_sample_yaml() / from_dict with extended=True / orient options
• __eq__ on projects

No source files or tests are named. Start by locating the peprs-py entry points for the unchecked APIs listed in the issue, then confirm with maintainers which items remain in scope; done should mean the agreed features are implemented and covered by the project's existing validation.