Remove Keras ML code

[Copilot]

Removes deprecated Keras-based ML training and inference code to be replaced by modern LLM trainers.

Deleted

• train.py, generate.py - Keras training/generation scripts
• loda/ml/keras/ - Complete RNN model implementation (335 lines)
• TensorFlow dependencies from requirements.txt

Updated

• sample.py - Removed Keras imports
• tests/test_ml.py - Removed Keras imports (tests already disabled)
• Documentation files - Removed ML/Keras references from README, copilot instructions

Preserved

• loda/ml/util.py - Token conversion utilities still useful for future implementations

Net reduction: 458 lines removed. All 86 tests pass.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove Keras ML code</issue_title>
<issue_description>Remove the Keras ML code including all training and inference code. It is not needed anymore and will be replaced later by modern LLM trainers. Clean up the documentation and copilot instructions if needed.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove Keras ML code #13

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