Change opencode and pi model filtering to use 'coding' type instead of
more generic 'text-generation' type. Update llama-swap model configs to
include 'coding' in metadata type list for relevant models (deepseek-coder,
qwen-coder, mistral, codellama, llama3-8b-instruct-q5).
- Add pi module for terminal configuration
- Include pi-coding-agent package in home.packages
- Configure pi with llama-swap provider via models.json
- Enable pi for mac-va-mbp-work profile
