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-r47-doc-colour.txt

@@ -0,0 +1,5 @@
+**The colour file stays, and its filename is the whole reason.** Nothing
+points at `values/ic_launcher_background.xml` since the ground became a
+drawable — `values-v31/themes.xml` writes the splash colour as a literal on
+purpose — and deleting it would build. It is kept because
+`src-tauri/icons/android/values/ic_launcher_background.xml` declares the same