Method start

crates/opencode-session/src/prompt.rs:720–736

(&self, session_id: &str)

    }

    async fn start(&self, session_id: &str) -> Option<CancellationToken> {
        let state = self.state.lock().await;
        if state.contains_key(session_id) {
            return None;
        }
        drop(state);

        let token = CancellationToken::new();
        let mut state = self.state.lock().await;
        state.insert(
            session_id.to_string(),
            PromptState {
                cancel_token: token.clone(),
            },
        );
        Some(token)
    }

    async fn resume(&self, session_id: &str) -> Option<CancellationToken> {
        let state = self.state.lock().await;