Audit: the #1656 page-1 disposition for p1-fc6d6deb9fe7 records a refuted explanation that bbox reuse would copy forward #1858

Summary

assets/bugfixes/issue-1656/render-clusters-page-1.json disposes cluster
p1-fc6d6deb9fe7 to #1660 with this note:

The cluster is the last glyph of a blocked cell against its column gridline: the
native export draws it whole and the output cuts it on the gridline (400% crop of
p1-fc6d6deb9fe7 reads rell against rel).

The explanation is refuted. Re-measured on main (1dc1ae29), the native Excel for
Mac export carries its own clip_path on the column gridline and paints the
overhanging glyph cut, exactly as we do — see the closing measurement on #1660.
What the crop actually caught is a whole-glyph count difference from the #1659
whole-point pacing drift, which is what every other cluster in that same report is
dispositioned to.

The cluster itself is gone: re-running that report's own census on main —
compare_render.py tests/fixtures/xlsx/100-customers.xlsx output --page 1 --dpi 150,
the snapshot's 5% fuzz and 20pt² floor — yields 0 clusters against the 56 it
recorded. #1853 removed them.

Why this is worth a record rather than an edit

The report is a frozen per-PR evidence snapshot, the same status AGENTS.md gives
before.jpg ("captures the pre-fix output"). Rewriting it would misrepresent what
that audit observed, and touching any assets/bugfixes/** cluster report makes
scripts/check_visual_pr.py demand a full ## Visual audit with gt/before/after
evidence for a change that produces no pixels.

The risk is the documented re-audit shortcut: match new clusters to the committed
prior report by bounding box and hand-review only what moved. A cluster reappearing
near x 268.8, y 616.8, 6.24 x 9.12pt on that page would inherit a note whose
stated rule is wrong, and #1660 — the issue it points at — is closed.

Expected

A re-audit of 100-customers.xlsx page 1 re-derives that cluster's disposition from
the current measurement instead of reusing the note, or the note is refreshed as part
of the next audit that legitimately regenerates that report.

Actual

The note stands as committed, stating a rule the native export's own clip rectangle
refutes.

Related: #1660, #1659, #1656