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-r51-library-ta.txt

@@ -0,0 +1,17 @@
+    /// Which record a track belongs to.
+    ///
+    /// The one lookup that was missing: everything else here starts from an
+    /// album. A tap on a track row in a car has to become "that record, from
+    /// that track" — the phone's own `playIndexRow` behaviour — and without
+    /// this the car would hand back a one-song queue.
+    pub fn track_album(&self, track_id: i64) -> Result<Option<i64>> {
+        let conn = self.conn.lock().unwrap();
+        Ok(conn
+            .query_row(
+                "SELECT album_id FROM tracks WHERE id = ?1",
+                [track_id],
+                |r| r.get::<_, i64>(0),
+            )
+            .optional()?)
+    }
+