Add Unsloth fused cross-entropy loss lesson

Fix Unsloth cross-entropy tensor mismatch error

Add working Colab training notebook with Unsloth + TRL

Add comprehensive learnings and findings documentation

Final hackathon submission - all docs updated

Add working demo training script

Update status and add lessons learned

Bust Docker cache for HF rebuild

Fix done field serialization for OpenEnv compatibility

Fix reward serialization - add reward field to ClaimsObservation

Fix training: Add SSL context + debug output for Colab

Update pitch: Complete vision + working demo list

Add product vision: Plaid + Scale AI integration

Fix: Add nest_asyncio for Colab/Jupyter compatibility

Add Plaid API integration for transaction verification