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-msg3.txt

@@ -0,0 +1,8 @@
+android: the library's file stats on the cards, the artist's own plays, the thumbnail prewarm
+
+The desktop Library's per-record file stats on the phone (library_album_stats,
+one call for the whole library): FLAC 24/96 or MP3 320k badges on the cards,
+the size on the list rows and the record page. The artist page's own
+listening (artist_play_stats): the time played as a chip, the most played
+track under "On this phone". The whole-library thumbnail warm a moment after
+boot, at the cards' edge, one decode at a time behind the tiles' gate.