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/commit-msg19.txt

@@ -0,0 +1,7 @@
+android: downloads on Wi-Fi only
+
+One switch the desktop never needed, off by default: on mobile data every
+Save the phone can start — a record, a track, a folder, a file, a
+playlist's bulk, the now-playing Save — waits, with the reason on the bar;
+streaming is never held back. The walk flips the switch, makes the
+connection cellular and sees a download refused.