YAML Support

[ben-nowacki]

Description

Added to/from YAML config support for ModelGraph, Phase, and Experiment classes

• to_yaml() and from_yaml() methods added to primary classes (e.g,. Experiment)
• YAML files store full configuration specs of the translated object, allowing from object instantiation from a YAML file

Reworked phase result containers

• Added new ArtifactStore for user-created artifact logging (e.g., matplotlib figures)
• Refactored ExecutionContext tracking to live within an ExecutionStore, matching data storage pattern of Metrics and Artifacts
• Added ability to save phase results (metrics, artifacts, and execution data) to disk.
  • On-disk results are persisted across serialization cycles
  • Results access from PhaseResults (e.g., results.tensors()) works regardless of in-memory vs on-disk storage

Added new Predicates class

• Wraps lambda conditions (e.g., "lambda x: x <= 45") used in ConditionSplitter and FeatureSet filtering logic
• Direct storage of lambda function prevented serialization of FeatureSets containing these lambda conditions in the data processing history
• Predicates class now wraps lambda functions allowing for full serialization/deserialization cycles

Bug fixes

• Fixed stale FeatureSetView references of EvalPhases during CrossValidationFolds
• Fixed optimizer and model living on different devices when using hardware acceleration
• Fixed serialization issue with ConditionSplitter lambda conditions. Solved via new Predicates class

Documentation:

• Added how-to notebook on using and creating Callbacks
• Added how-to notebook on using CrossValidation

Related Issues

N/A

How Has This Been Tested?

• Local pytest run
• CI passes
• Manual checks

Checklist

• My code follows project style guidelines: nox -s pre-commit
• I have added tests that prove my fix is effective or my feature works: nox -s unit
• I have updated documentation if needed: nox -s docs
• I have linked related issues

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 14.11683% with 1235 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
modularml/core/io/yaml/translators/phase.py	0.00%	156 Missing ⚠️
modularml/core/io/handlers/experiment_handler.py	2.58%	151 Missing ⚠️
modularml/core/io/yaml/translators/model_graph.py	0.00%	105 Missing ⚠️
modularml/core/experiment/experiment.py	7.92%	93 Missing ⚠️
modularml/core/io/yaml/__init__.py	0.00%	87 Missing ⚠️
modularml/predicates.py	46.04%	75 Missing ⚠️
modularml/core/io/yaml/translators/references.py	0.00%	63 Missing ⚠️
modularml/core/io/yaml/translators/experiment.py	0.00%	61 Missing ⚠️
...odularml/core/experiment/results/artifact_store.py	32.09%	55 Missing ⚠️
modularml/core/io/yaml/translators/callback.py	0.00%	46 Missing ⚠️
... and 28 more

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