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-r30-doc-lyrics.txt

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+The room also measures the recording. `lyrics_vocal_activity` is the
+desktop's coarse vocal-band envelope — the centre channel band-passed to
+180 Hz – 7.5 kHz, one value per 100 ms, read on a blocking thread — and it
+draws as a strip under the head, so the singing ahead is visible while the
+thumb waits for it. **Estimate the timing** lays every line across the
+stretches the envelope says are sung, weighted by line length, through the
+desktop's own generator (`src/lib/lyric-sync.js`, shared and unit-tested):
+never an even spread over the duration, and a refusal rather than a guess
+when the measurement shows nothing usable. The result is labelled an
+estimate everywhere it shows — the hint under the line, the Save button —
+the cursor goes back to the top so the taps correct it from there, and one
+more tap on the button drops the whole thing back to an empty set (a rough
+fill stamps every line at once, so Undo has nothing left to take back).
+A streamed track has no finished file to measure, so the button says there
+is no estimate for that one — the same rule the reduced-vocals copy follows,
+and the same whole-file decode behind both.