use std::future::Future;use std::pin::Pin;use codex_protocol::ThreadId;use http::HeaderValue;pub(crate) const X_OAI_ATTESTATION_HEADER: &str = "x-oai-attestation";pub type GenerateAttestationFuture<'a> =    Pin<Box<dyn Future<Output = Option<HeaderValue>> + Send + 'a>>;/// Request context that host integrations can use when deciding whether to/// generate an attestation header value.#[derive(Clone, Copy, Debug)]pub struct AttestationContext {    /// Thread whose upstream request is being prepared.    pub thread_id: ThreadId,}/// Host integration boundary for just-in-time attestation header values.////// Implementations own the policy for when attestation should be attempted and/// return the upstream `x-oai-attestation` header value when one should be sent.pub trait AttestationProvider: std::fmt::Debug + Send + Sync {    fn header_for_request(&self, context: AttestationContext) -> GenerateAttestationFuture<'_>;}