- A tail request counts only for closing rows that can start a batch,
using the same membership rule as the batch, and detaching clears it.
- A batch keeps the reader landing while reading movement awaits
sampling, so an unsampled scroll away from the tail is not undone.
- Reader scrolling during a reader landing moves the reference row's
recorded position, so the final correction keeps only layout changes.
- The blank-area matrix releases a partly opened world, fails a case on
cleanup errors, mounts only the provider catalog for the Turn that fails
before its model call, names its gap as a layout gap, and labels the
steering case as a no-fold control.
- The note records the pending-sampling rule and the opacity of a row
that joins the travelling set after fading.
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