use crate::session::turn_context::TurnContext;use codex_protocol::protocol::MultiAgentVersion;use codex_protocol::protocol::SessionSource;use codex_protocol::protocol::SubAgentSource;pub(super) fn usage_hint_text<'a>(    turn_context: &'a TurnContext,    session_source: &SessionSource,) -> Option<&'a str> {    if turn_context.multi_agent_version != MultiAgentVersion::V2 {        return None;    }    let multi_agent_v2 = &turn_context.config.multi_agent_v2;    if !multi_agent_v2.usage_hint_enabled {        return None;    }    match session_source {        SessionSource::SubAgent(SubAgentSource::ThreadSpawn { .. }) => {            multi_agent_v2.subagent_usage_hint_text.as_deref()        }        SessionSource::Cli        | SessionSource::VSCode        | SessionSource::Exec        | SessionSource::Mcp        | SessionSource::Custom(_)        | SessionSource::Unknown => multi_agent_v2.root_agent_usage_hint_text.as_deref(),        SessionSource::Internal(_) | SessionSource::SubAgent(_) => None,    }}