Function detect_dead_code 

pub fn detect_dead_code(
    options: &DeadCodeOptions,
) -> Result<Value, ProgrammaticError>

Run dead-code analysis and return the JSON output contract.

This runtime path is owned by fallow-api and uses the typed engine plus output crates directly.

Errors

Returns a structured programmatic error for unsupported options, invalid options, config load failures, analysis failures, git changed-file failures, or serialization failures.