Updated model with current best practices, added getting started notebook

[drewoldag]

Updating the example model to show current Hyrax best practices.
Implemented a VGG11 model.
Created a getting started notebook that uses the VGG11 model and trains on HyraxCifar data - results in 70% accuracy.

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Codecov Report

❌ Patch coverage is 26.08696% with 51 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.08%. Comparing base (a5fcd6a) to head (783593f).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/external_hyrax_example/models/vgg11.py	23.88%	51 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              main       #5       +/-   ##
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- Coverage   100.00%   26.08%   -73.92%     
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  Files            2        2               
  Lines            6       69       +63     
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+ Hits             6       18       +12     
- Misses           0       51       +51     

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[Copilot]

Pull request overview

This PR updates the external Hyrax example package to showcase a more realistic CNN model (VGG11) and adds a pre-executed “getting started” notebook demonstrating training/inference on HyraxCifar data.

Changes:

• Added a VGG11 PyTorch model registered via @hyrax_model, including train/validate/test/infer batch hooks.
• Updated the package default config and public exports to use VGG11 instead of the removed ExampleModel.
• Added a pre-executed notebook documenting end-to-end usage, and updated .gitignore for generated outputs/data.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/external_hyrax_example/models/vgg11.py	New VGG11 model implementation + Hyrax loop hooks and data preparation.
src/external_hyrax_example/example_model.py	Removed the prior minimal example model.
src/external_hyrax_example/default_config.toml	Switched default configuration structure to external_hyrax_example.VGG11.*.
src/external_hyrax_example/__init__.py	Export VGG11 as the package public model.
pyproject.toml	Added hyrax and torch dependencies.
docs/pre_executed/model_usage_example.ipynb	Added a pre-executed notebook showing how to configure/train/infer/evaluate.
.gitignore	Ignored Hyrax results directories and local data/.

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[mtauraso]

LGTM