Reflex<P> owns a tokio::sync::mpsc::Receiver<AdvisoryEvent> (the advisory channel the TapEngine feeds from its tokio task), so tokio must be a runtime dep of rutster-media at lib-compile time, not dev-only. The crate itself makes no tokio runtime calls — the dedicated media thread drives Reflex, not an executor (ARCHITECTURE.md; slice-1 spec §3.4). Signed-off-by: Aaron D. Lee <himself@adlee.work>