feat: add TAO WTS and AETC SFT support

[ramanathan831]

Summary

• add TAO-compatible WTS supervised fine-tuning recipes for Cosmos Nano and Edge
• add TAO status reporting, epoch-based validation/checkpoint integration, and non-root container support
• add DAFT-backed AETC supervised fine-tuning configuration
• exclude Python bytecode from Docker build contexts

Why

This brings the TAO training workflow from the Cosmos-RL integration into Cosmos Framework so fine-tuned Framework checkpoints can be trained and consumed by TAO actions without merging the public Cosmos-RL implementation into the runtime image.

Impact

Users can launch WTS and AETC SFT through Cosmos Framework with TAO-compatible reporting and checkpoint behavior. The Docker image can run under non-root Pyxis and SLURM environments.

Validation

• built the Cosmos Framework container image
• completed full WTS Nano and Edge training on SLURM
• completed full AETC Nano and Edge training on the parity dataset
• completed 367-sample AETC evaluations and compared Cosmos-RL and Framework BERTScore results