chore(media): add tokio dep for Task 2 Reflex<P> consumer (slice-4 §3.2)

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>

Cargo.lock

@@ -1239,6 +1239,7 @@ dependencies = [
  "rutster-call-model",
  "str0m",
  "thiserror 1.0.69",
+ "tokio",
  "tracing",
 ]
 

crates/rutster-media/Cargo.toml

@@ -13,5 +13,13 @@ opus = { workspace = true }
 str0m = { workspace = true }
 thiserror = { workspace = true }
 tracing = { workspace = true }
+# tokio: required at lib-compile time because `Reflex<P>` owns a
+# `tokio::sync::mpsc::Receiver<AdvisoryEvent>` (the advisory channel the
+# TapEngine feeds from its tokio task). rutster-media proper makes NO
+# tokio runtime calls — the dedicated media thread drives `Reflex`, not a
+# tokio executor (ARCHITECTURE.md "dedicated timing threads, not the
+# shared tokio pool" — see slice-1 spec §3.4). The `full` features here
+# also cover `#[tokio::test]` + `#[tokio::main]` in the binary/tests.
+tokio = { workspace = true }
 
 [dev-dependencies]