android: the handoff — the pending rounds, the pipeline, and what is unverified

Everything written this session that has not been through the device: rounds 43
to 48 (each patch adversarially verified, 43's transient-notice expectation
fixed), a partial round 49, the pipeline scripts, the Android Auto design and
the icon comparison mock. Also the two harness changes that were never A/B'd —
adaptive waits, which may only shorten a declared wait and never lengthen it,
and a ship that runs the mock walk and the deploy at the same time. The A/B and
its 255-step baseline are in handoff/tools; main stays at what the phone has
actually walked.

handoff/rounds/ins-r46-rust-item.txt

@@ -0,0 +1,24 @@
+fn yes() -> bool {
+    true
+}
+
+/// One entry of the queue window. Deliberately flat and small: this crosses
+/// two hops of IPC on every update — the WebView to Rust, Rust to Kotlin —
+/// so it carries what a media3 `MediaItem` is built from and nothing else.
+/// `art_key` is the same kind of key `NowPlaying::art_key` is, the cover's
+/// path, so whatever decodes a bitmap for the card can key the window's
+/// covers off the same thing; no bytes ride along here.
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct QueueItem {
+    /// The track's own id as a string — a library track's is a number, a
+    /// catalog track's is `cat:<n>`, a playlist row's is `pl<n>`. NOT a
+    /// unique key: one queue may hold the same track twice, and a window
+    /// entry is identified by where it sits, not by this.
+    pub id: Option<String>,
+    pub title: Option<String>,
+    pub artist: Option<String>,
+    pub album: Option<String>,
+    pub duration: Option<f64>,
+    pub art_key: Option<String>,
+}