Function compress_tool_output_cli 

pub fn compress_tool_output_cli(
    output: &Value,
    tool_name: &str,
    config: &CompressionConfig,
) -> String

CLI variant of compress_tool_output - produces strict valid JSON with CLI-syntax retrieval hints.

Differences from compress_tool_output():

• retrieval_hint uses CLI syntax (sync-ctl retrieve '<ref_id>' --query '...')
• Does NOT append format_session_refs_for_agent() plaintext footer
• Output is guaranteed valid JSON