Update main

[PabloCorcho]

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[Copilot]

Pull request overview

This PR appears to modernize PST’s modeling stack by introducing a shared Parameter/ModelBase system, moving chemical-evolution models into a new pst.cem module (with pst.models deprecated), and adding new SED building blocks (SED components, dust, and a composite galaxy SED). It also expands the unit test suite around these new APIs and updates CI Python versions.

Changes:

• Introduce pst.model (Parameter, ModelBase) and extend unit handling utilities (check_unit, check_parameter).
• Add/extend core modeling modules: pst.cem, pst.sed, pst.dust, pst.galaxy, plus photometry acceleration via observables.FilterList.
• Add significant new/expanded unit tests and bump CI matrix to Python 3.12.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
tests/test_sed.py	New tests exercising GalaxySED end-to-end SED + photometry outputs.
tests/test_observables.py	Extends filter tests (plot API, flambda error) and adds FilterList coverage.
tests/test_models.py	Expands CEM tests (names, parameter recursion, tabular variants, age binning).
tests/test_galaxy.py	New validation tests for GalaxySED redshift handling and derived state updates.
tests/test_dust.py	Major expansion of dust/attenuation/emission/calorimetric tests.
tests/test_base_model.py	New tests for Parameter and ModelBase behavior.
src/pst/utils.py	Adds Parameter support to check_unit, adds check_parameter, adds broadcast_to_axis.
src/pst/sed.py	New SED component abstractions and StellarComponent.
src/pst/observables.py	Adds FilterList, changes filter plotting return values, caches AB normalization.
src/pst/models.py	Deprecates pst.models and re-exports from pst.cem.
src/pst/model.py	New foundational Parameter and ModelBase implementation.
src/pst/galaxy.py	New composite GalaxySED component.
src/pst/dust.py	Major refactor/expansion: attenuation curves/models, dust emission, calorimetric coupling.
src/pst/data/lick/lick_mgb.json	Adds Lick index definition data.
src/pst/data/lick/lick_hb.json	Adds Lick index definition data.
src/pst/cem.py	New chemical evolution model implementations migrated from models.
src/pst/init.py	Switches top-level import exposure from models to cem.
src/pst/SSP.py	Updates SSP wavelength interpolation to use check_unit and short-circuit when already sampled.
.github/workflows/testing.yml	Updates CI Python versions to include 3.12 and drop 3.9.

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[PabloCorcho]

@paranoya I think this is ready for getting merged and released.