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-r21-prompt.txt

@@ -0,0 +1,10 @@
+    /* the contact editor's three fields go through the prompt sheet. The
+       username travels as a VALUE, the way the playlist prompts do: the
+       sheet switches kind under the prompt, so the contact block's
+       {@const} is a destroyed derived by the time Save lands. */
+    function metaPrompt(u, field, title, placeholder, value, multiline = false) {
+        openHalf("prompt", {
+            title, value, placeholder, ok: "Save", multiline, allowEmpty: true,
+            onsubmit: (v) => { void setMeta(u, { [field]: v }); openHalf("contact", { username: u }); },
+        });
+    }