docs: the window size cannot be restored under a tiling compositor

Item 75 shipped claiming the rules window remembers its size. It does
not, and no code here can make it.

Hyprland tiles the window to fill its slot, so the size dragged belongs
to the tile. saveGeometry stores frameGeometry beside normalGeometry and
restoreGeometry restores the normal one, which stays at whatever
resize() last set it to. Decoded from the real state file after a hand
test: frame 2248x806, normal 760x664. The dialog restores 760 correctly
and still opens tiled.

Three diagnoses were tried before this one and each was disproved by a
probe rather than argued away: that restoreGeometry rejected the blob as
off-screen, that the layout overrode a geometry applied before the first
show, and that a test could tell the broken and fixed versions apart.
The last one matters most: the offscreen platform returns an identical
frame for both, so a size assertion passed against the bug and a
mutation restoring it left the suite green. That assertion is not
reinstated.

The column widths, which are what actually works, keep their test. The
changelog and the backlog entry are corrected to say what ships, and
CLAUDE.md gains both the tiling-compositor trap and the rule that the
offscreen platform cannot test window sizing at all.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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