pub fn load_agents_md(project_dir: &Path) -> Option<String>Expand description
Search project_dir for an AGENTS.md file and return its content.
Returns Some(content) for the first file found in the priority order
listed above, or None if no file exists.
§Why first-match-wins?
Concatenating multiple files would make the system prompt unpredictable in length and could smuggle conflicting instructions. A single file is intentional: the most specific file (.xcodeai/AGENTS.md) overrides the generic one (AGENTS.md).