Function github_issues_rust 

pub fn github_issues_rust(
    repo: Option<&str>,
    number: Option<u64>,
    query: Option<&str>,
    kind: &str,
    state: &str,
    sort: Option<&str>,
    limit: usize,
    labels: Option<&str>,
) -> String

Pure-Rust dispatcher for the github_issues tool.

Returns a user-facing string for all logical conditions (invalid repo, fetch failure, etc.). Callers that want structured errors should invoke the _internal functions directly.