Function gemini_dedicated_rules_path 

pub fn gemini_dedicated_rules_path(home: &Path) -> PathBuf

Dedicated-mode rules file for Gemini CLI, auto-loaded via settings.json context.fileName instead of polluting ~/.gemini/GEMINI.md. The filename is deliberately distinctive: Gemini discovers context files by name across the project tree, so a generic lean-ctx.md would get picked up everywhere.