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-js-fill.txt

@@ -0,0 +1,11 @@
+        hasNext: player.qi + 1 < player.queue.length || player.repeat > 0,
+        hasPrev: true,
+    };
+    /* the window, clamped at both ends. `at` is recomputed rather than
+       assumed to be QUEUE_WINDOW: at the top of the queue the slice starts
+       at 0 and the current item is the first entry, not the eleventh. */
+    const lo = Math.max(0, player.qi - QUEUE_WINDOW);
+    const win = player.qi < 0 ? [] : player.queue.slice(lo, player.qi + QUEUE_WINDOW + 1);
+    const at = player.qi - lo;
+    state.queue = win.map(windowItem);
+    state.queueIndex = at >= 0 && at < win.length ? at : null;