Function no_writable_protocol_failure

crates/openshell-router/src/backend.rs:448–456

The request-shape failure for a route that advertises no writable protocol. Shared by the empty-probe guard and the all-probes-failed fallback so the otherwise-unreachable terminal case is a value rather than a panic.

(route: &ResolvedRoute)

/// Shared by the empty-probe guard and the all-probes-failed fallback so the
/// otherwise-unreachable terminal case is a value rather than a panic.
fn no_writable_protocol_failure(route: &ResolvedRoute) -> ValidationFailure {
    ValidationFailure {
        kind: ValidationFailureKind::RequestShape,
        details: format!(
            "route '{}' does not expose a writable inference protocol for validation",
            route.name
        ),
    }
}

pub async fn verify_backend_endpoint(
    client: &reqwest::Client,