Function get_compact_planning 

pub fn get_compact_planning(model: Option<&str>) -> bool

Whether to use compact planning prompt (rule filtering + fewer examples).

• If SKILLLITE_COMPACT_PLANNING is set: use that (1=compact, 0=full).
• If not set: only latest/best models (claude, gpt-4, gpt-5, gemini-2) use compact; deepseek, qwen, 7b, ollama etc. get full.