Function derive_section_status 

pub fn derive_section_status(cfg: &Config) -> ConfigStatusResult

Pure derivation of the section status response from a config snapshot. needs_quickstart is false iff at least one enabled [agents.<alias>] block has a resolved model provider with a selected model plus resolved risk/runtime profile refs. A provider without a bound, runnable agent is not a completion signal: chat dispatch still bounces with a setup error in that state.