Function check_context_invariant 

pub fn check_context_invariant(
    rel: &str,
    content: &str,
    config: &AuditConfig,
) -> Vec<Issue>

Check instruction files for machine-local path references.

Flags paths like ~/, /home/user/, /Users/user/, /tmp/ that won’t resolve on other machines. These should use repo-relative paths or declared dependency references instead.