SANITIZED DEMONSTRATION RECEIPT
Demonstration date: October 6, 2026

Scope: disposable documentation fixture, authored for teaching. The replacement
sentence was deliberately withheld. The saved input wait, Media answer, resumed
Codex edit and independent Claude review were real. The input wait was recorded
as in_review. This was not a customer incident or a defect in the published guide.

Intended result: replace only line 3 with the supplied sentence. Preserve the
heading, blank line and final newline. No other changes to the fixture.

Before (94 bytes), SHA-256:
c5dd008ad75b25b0cf4ae1a20c44ad5590c888b4ac19f5a9935c6900e39a14bb
After (153 bytes), SHA-256:
4d59fff2d822af6dc63e74885b779eb60aee0b001e40c22e739a3e1fb2716e48

Exact one-line diff:
-Task acceptance means this change is merged and deployed.
+Task acceptance confirms that the file was reviewed and checked; it does not mean the change was merged or deployed.

Checker result: PASS, exit 0. The after file exactly matched the supplied
replacement sentence, with the heading, blank line and final newline preserved.

Independent review: a different engineer running Claude downloaded the saved
package, compared the supplied answer with line 3, verified the file hashes and
one-line diff, ran the checker successfully and approved the artifact. Codex
executed the edit; Claude reviewed it. No underlying model version is claimed.

Outcome: reviewed and checked document artifact. No website file change,
repository branch, pull request, merge, deployment or publication resulted from
this demonstration. This receipt and the article preview were assembled later.

This excerpt removes private operational identifiers and links. The downloadable
before and after files preserve the exact reviewed bytes. This single staged task
does not establish general recovery, performance, cost or scalability claims.