feat: separate cross validation and training

[Manit-J]

Description

Adds a new script called cross_validation.py to separate CV from training.
Edits the train.py script to only train the model.
Runs CV and stores the results in separate text and json files (for readability and to plot graphs later).

Fixes #155

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[linear]

ATT-169 Separate CV and Training

[vercel]

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Project	Deployment	Review	Updated (UTC)
attention-agent	Ready	Preview, Comment	Jan 21, 2026 11:22pm

[salsaady]

Looks good