Answers review of revision 15. Still framing only; no code. Three of
the four changes correct 15's own reasoning.
**THE PANEL PREREQUISITE IS NOW IN THE TOPOLOGY, NOT A FOOTNOTE.** The
defect is exactly "frontend emits, receiver discards", so 15's
emission-only panel witnesses would have reproduced the blind spot that
let it sit undetected --- passing rows meaning nothing about whether a
panel wheel scrolls. SS3 now reads `1a` -> panel-replay lane -> `1b`:
the lane MERGES FIRST, 1b REBASES onto its merge commit (its base moves
off `72da24a`), and 1b carries an END-TO-END panel-wheel EFFECT
witness.
15's rationale "it is not input work" was wrong --- replay covers
terminal mouse reporting and click-to-focus, which is input work. The
accurate reason is breadth and ownership: acceptance 48
(`docs/bottom-panel-framing.md:1719`) has `PanelPointer` driving
listview row selection, panel selection, terminal mouse reporting and
click-to-focus. A wheel is one gesture in that set.
**DIVIDER AND BACKGROUND MUST BANK NOTHING.** 15 gave them the panel
cell's residual, which manufactures the very surface-switch jump B1
forbids: motion banked over an inert target, then spent the instant the
pointer enters a cell, so a gesture that scrolled nothing completes a
tick on arrival. They discard and reset both axes; any state kept there
must be incapable of combining with cell input. A crossing witness
pins it --- background partial plus cell partial must not reach a tick
--- and its mutation is precisely 15's error.
**THE DISCRIMINATING SETUP BELONGS TO EVERY LIFETIME ROW.** 15 stated
it for L3 alone. With the cursor inside the manually scrolled viewport,
`follow_left` returns that same origin, so held authority and released
authority produce IDENTICAL state and the row passes either way. L1,
L2, L4, L6, L7 and L8 now share L3's cursor-outside setup. L2 becomes a
HEIGHT-ONLY GPU resize, so it invokes the real follow without moving
the clamp. L7 splits: 7a widens the viewport, 7b SHRINKS THE CONTENT
--- clause 3 promises re-clamping on geometry AND content, and widening
witnesses only the geometry half.
**THE MUTATION TABLE NOW OBEYS SS6.** 15's heading promised "own rows
and no others"; SS6 of this same document says that promise is false
and cannot be made true, and requires instead that a mutation bite its
named rows with dependents NAMED. Rewritten that way, with the
legitimate dependents listed per mutation.
Ledger: checkpoint was still "revision 14", and described the snap-back
as next-paint without the TUI/GPU split that 15 established. Both
corrected, and the prerequisite recorded as a blocker with the rebase.
Also records CI-red signature **U10**. The first gate run of this tree
red on `composition_overhead_under_ten_percent` in `03-lib` at 1.343x,
and the SAME RUN's sweep passed it, on a documentation-only diff. Worth
a row beyond the usual: U9 asked whether sweep test-binary concurrency
was the discriminator, and this occurrence runs that comparison in the
opposite direction and gets the opposite result --- red at low
concurrency, green at high. That retires the candidate without
supplying a cause; two occurrences pointing opposite ways across one
variable means the variable is not the discriminator, nothing more.
U9's synthetic-load control is still the useful experiment and is still
unrun.
Gates: all nine green under `env -u TMPDIR`, log 20260814T082533Z.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016bqGA6s9tTUFzYpbeW3tai
Levi Neuwirth
cf63f63a07