Add CNN Model for MNIST Classification (✓ Sandbox Passed)

[sweep-nightly]

Description

This pull request adds a Convolutional Neural Network (CNN) model for MNIST classification. It also updates the import statements and file references accordingly.

Summary

• Updated import statements and file references in src/api.py and src/main.py.
• Added src/cnn.py which contains the CNN model for MNIST classification.
• Updated the model instantiation in src/api.py and src/main.py to use the new CNN model.
• Updated the model saving in src/main.py to save the CNN model.

Fixes #9.

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[sweep-nightly]

Sandbox Executions

• Ran sandbox for src/cnn.py. ✓

Sandbox logs for

trunk fmt src/cnn.py || exit 0 1/2 ✓

Checked 1 file
✔ No issues
Run trunk upgrade to upgrade 1 linter

trunk check --fix --filter=-ruff --print-failures src/cnn.py 2/2 ✓

Checked 1 file
✔ No issues

• Ran sandbox for src/main.py. ✓

Sandbox logs for https://github.com/sweepai/evals/commit/46ccf85ba5409fdfb9375c6a179ed6fa450ee031

trunk fmt src/main.py || exit 0 1/2 ✓

 ✔ Formatted src/main.py
Re-checking autofixed files...

 ✔ Formatted src/main.py
Re-checking autofixed files...


Checked 1 file
✔ No issues
Run trunk upgrade to upgrade 1 linter

trunk check --fix --filter=-ruff --print-failures src/main.py 2/2 ✓

Checked 1 file
✔ No issues

• Ran sandbox for src/api.py. ✓

Sandbox logs for https://github.com/sweepai/evals/commit/65c814323bf275a7c1a780567ebe9e5437fa77c0

trunk fmt src/api.py || exit 0 1/2 ✓

 ✔ Formatted src/api.py
Re-checking autofixed files...

 ✔ Formatted src/api.py
Re-checking autofixed files...


Checked 1 file
✔ No issues
Run trunk upgrade to upgrade 1 linter

trunk check --fix --filter=-ruff --print-failures src/api.py 2/2 ✓

Checked 1 file
✔ No issues

[sweep-nightly]

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