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docs(lane): record the completed B5 panel geometry seam 

Advance the GUI Stage 1b ledger to the immutable code head and correct
the central-hook claim. Counting reshape callers missed two panel-band
transitions: accepted frame changes and geometry epoch invalidation.

Record the shared inset-change seam, the content-only repaint exception,
the 309-row GPU pass, workspace clippy/fmt/diff verification, and all four
executed mutations.
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Levi Neuwirth 2026-09-01 19:18:39 +02:00
parent 175cc7be16
commit cc07642b04
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@ -319,23 +319,33 @@ Framing
this base, the panel-replay prerequisite recorded as DISCHARGED by #243,
and the both-axis effect witness still owed.
**Landed so far** (head `a4627cd`)**:** B1's per-target fractional
**Landed so far** (code head `175cc7b`)**:** B1's per-target fractional
wheel residual (the producer), B2's daemon-side horizontal panel leg,
B3/B7's shared `scroll_window_columns` with its saturated bound and wrap
pin, B4's middle-click PRIMARY paste, and **B5's I-beam**, whose icon is
re-derived in **`reshape`'s tail** — the one point every geometry settle
already passes through, reached by the line-number mode, minimap
arrival, panel appearance, resize and font metrics alike. Three
production appliers remain, one per cause (pointer motion, menu
ownership without geometry, geometry), and each fires a disjoint set of
rows under its own removal.
re-derived in **`reshape`'s tail**. Panel inset transitions now terminate
at `reshape_if_panel_band_changed`: accepted `Present`/`Absent`/row-count
changes and a geometry declaration disowning the retained frame all
reach the hook, while a content-only frame repaints without rebuilding
the document. Three production appliers remain, one per cause (pointer
motion, menu ownership without geometry, geometry).
B5 took three rounds to get there. The first two patched the paths that
had been noticed — the snapshot arm, then a `set_menu` helper — and both
times the two appliers masked each other, so a row's documented mutation
named something the row could not see. **A witness whose mutation is
masked is not weaker evidence than a real one; it is evidence of
nothing, and it reads identically in the diff.**
B5's central-hook correction needed one more pass. Counting ten
`reshape` call sites did **not** establish that every boundary-changing
transition reached one: `PanelFrame` synchronized dimensions and
redrew without reshaping, and advancing `geometry_epoch` disowned the
retained frame *after* resize/font handling had reshaped against its old
presentation. The earlier two path patches — the snapshot arm, then a
`set_menu` helper — had the dual defect: each masked the other, so a
row's documented mutation named something the row could not see. **A
witness whose mutation is masked is not weaker evidence than a real
one; it is evidence of nothing, and it reads identically in the diff.**
At `175cc7b`, all 309 GPU rows pass; workspace clippy with all targets
and `-D warnings`, fmt and `git diff --check` are clean. Four mutations
were executed and each fires its named row: omit accepted-frame reflow,
omit epoch-invalidation reflow, reshape content-only frames, and retain
divider hover on `Absent`.
**Landed but NOT yet witnessed** — recovery needs this split, because
"L1–L8 owed" reads as though none of the mechanism exists: