Method resume

crates/opencode-session/src/prompt.rs:738–741

(&self, session_id: &str)

    }

    async fn resume(&self, session_id: &str) -> Option<CancellationToken> {
        let state = self.state.lock().await;
        state.get(session_id).map(|s| s.cancel_token.clone())
    }

    pub async fn is_running(&self, session_id: &str) -> bool {
        let state = self.state.lock().await;