On branch feature-add-mamba-arch-support
Changes to be committed:
new file: IMPLEMENTATION_SUMMARY.md
new file: MAMBA_INTEGRATION.md
new file: QUICKSTART_MAMBA.md
new file: configs/README.md
new file: configs/hybrid_alternating_d20.py
new file: configs/hybrid_early_t_late_m_d20.py
new file: configs/mamba_d20.py
new file: configs/rtx3070_d16.py
new file: configs/transformer_d20.py
new file: nanochat/blocks/__init__.py
new file: nanochat/blocks/mamba_block.py
new file: nanochat/blocks/transformer_block.py
modified: nanochat/checkpoint_manager.py
modified: nanochat/gpt.py
new file: tests/test_hybrid_blocks.py
