Expose missing plotting exports and align version metadata

[Copilot]

Improve top-level imports so plotting helpers like rxp_phart are accessible directly from ryxpress, and align package version metadata across pyproject.toml and __init__.py.

• Exports
  • Add lazy export for rxp_phart (plotting)
  • Align module mapping documentation with actual filenames
• Versioning
  • Bump package version to 0.1.3 in pyproject.toml and __init__.py
• Tests
  • Add a lightweight test to confirm new exports resolve from ryxpress

Example:

from ryxpress import rxp_phart

Original prompt

please complete init.py to make submodule importing better, for examalpe rxp_phart is not listed there so I need to do from ryxpress.plotting import rxp_phart but I don’t want to have to write all that, so double check that everything is there, also make sure to bump version in pyproject toml and in init.py once you’re done

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[b-rodrigues]

@copilot do we need to have RRunResult importable?

[Copilot]

@copilot do we need to have RRunResult importable?

Removed the top-level RRunResult export and updated the import test accordingly in commit e0548d6.