docs(agents): the comment rule exempts a verbatim maintainer ruling preserved as a quotation block

AGENTS.md's comment rule gains one closed exemption beside the reporting
one: a verbatim maintainer ruling preserved as a quotation block. The
sentence lands in place in the Commit message sentence group at the
1075-line ceiling; the restated clause about the pair staying model-free
is the payment (the group's first sentence and the pre-push hook already
say it), and every line stays within the 120-byte width rule.

No probe in the tree reads prose for model identifiers: the pre-push gate
judges the trailer value only, the Served-tier readers judge one token,
the agent-model gate reads frontmatter pins, and the H64 row keys on
session ids. So no probe changes.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HZfg2AwVX191qCizp88gQr

Author: claude

AGENTS.md

@@ -438,10 +438,10 @@ recognised and the whole block lands under it, leaving two; the session-URL form
 verbatim and a bare one lands under it, leaving two. ⛔ A tail bare footer on a comment is the
 platform's, not your form downgraded. Which layer does this is unknown; don't go establishing
 it. **Commit message:** an agent commit ends with the model-free trailer pair
-`Claude-Session: https://claude.ai/code/session_<id>` and `Co-authored-by: Claude <noreply@anthropic.com>`,
-and the pre-push hook refuses a model identifier in that pair; no model identifier lands in a PR title or body,
-a comment, a changeset, a doc or a code comment. The one exemption is a REPORTING one: a harness-written
-`Co-Authored-By` trailer is not declared a deviation; the pair stays model-free; landed history is not rewritten.
+`Claude-Session: https://claude.ai/code/session_<id>` and `Co-authored-by: Claude <noreply@anthropic.com>`, and the
+pre-push hook refuses a model identifier in that pair; no model identifier lands in a PR title or body, a comment, a
+changeset, a doc or a code comment. Two exemptions: a harness-written `Co-Authored-By` trailer (REPORTING: not declared
+a deviation; landed history is not rewritten) and a verbatim maintainer ruling preserved as a quotation block.
 
 **GitHub mutates body BYTES — spell poison-shaped tokens out in words, never literally.**
 Regex literals and script-tag-shaped tokens go in fenced code with the dangerous character