Two Copilot findings on PR #24, one applied as asked and one applied only
in part, with the measurement that says why.
**The combined `grep` was a real hole.** `grep -n "?v=" a b c d` succeeds
when *any one* file matches, so under `set -e` three failed substitutions
still produced a "successful" assembly. Those greps are the only guard
against the generated wasm-pack glue changing shape — which is the exact
failure this cache-busting exists to end, twice, during improvise-9x6 — so
each stamped reference is now checked on its own and names itself when it
is the one missing. Inherited from the inline CI step rather than written
here, but it became mine when it became a script. Proved by pointing one
`sed` at a pattern that cannot match: the old form exited 0, the new one
exits 1 naming the file.
**The repaint count was the right objection to the wrong remedy.** Copilot
asked for "count the relevant grid mutations/repaints and prove the
assertion by removing the guard". Done, and it does not discriminate: with
`if (closed) return` removed from `edit`'s `close`, `close` still runs
exactly twice, `typed_cell` is still called exactly once, `#grid` still
takes exactly two childList mutations, and the final text is identical. The
only difference is one extra *entry* into `repaint()` that produces no DOM
change — because the second close is `close(false)`, so it does not
re-send, and everything else it does is idempotent. Which is exactly what
improvise-hwpi meant by "harmless before, but only by accident".
Counting `repaint()` entries would need a test hook inside `web/app.js`: a
page that knows it is being tested. So the half of the finding that stands
is the **name**, which claimed more than the body checked — the same defect
as `open_and_refresh_see_an_empty_origin_root` two commits ago. Renamed to
`committing an edit sends one frame and shows the host's value`, and the
measurement is recorded in the comment so nobody repeats it.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Edward Langley
5bfa747942