docs: the art check compares text, not bytes

[HarperZ9]

The claim

The renderer's module docstring carried this:

Here the picture is a pure function of a spec that IS diffable, so a test can
re-render and compare bytes.

That is not what happens. check_repo_art reads both sides like this:

if path.read_text(encoding="utf-8") != text + "\n":

Path.read_text applies universal-newline translation, so the comparison is over
text and a CRLF checkout passes either way. I wrote the claim, and the same
wording went out across the sibling repositories, so it is being corrected in
each of them.

Why it is worth a commit

The paragraph is the design rationale for check mode. Someone deciding whether
to trust the gate reads exactly this sentence, and what it promises is stronger
than what the gate delivers.

The byte-level reads are real, just elsewhere: the receipt records each drawing's
byte count and SHA-256 from read_bytes, which is why the art is pinned to LF in
.gitattributes. That pin is unchanged.

Scope

One docstring paragraph. No drawing moves, no check changes behaviour, and the
gate is green.

🤖 Generated with Claude Code