docs: AGENTS.md routing line and toc.py docstring describe docs/ as the whole human documentation (#187)

Closing-phase pull-through: both still described docs/ by its pre-9.0.0 role.

Files changed:
- AGENTS.md
- CHANGES.md
- VERSION
- tools/chemenu/toc.py

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

tools/chemenu/toc.py

@@ -31,8 +31,8 @@ decision, and did: `docs/` and the page type-specs sat outside it for no
 recorded reason at all.
 
 `docs/` belongs in for the reason the threshold exists. AGENTS.md § File naming
-calls it "Agents and humans | By link, or on explicit request" - agent-loaded,
-at a second hop, which is precisely the preview mechanic
+calls a page in one of its four areas "Humans and agents ... | By link, or on
+explicit request" - agent-loaded, at a second hop, which is precisely the preview mechanic
 `instructions/CONTRACT.md` § "Reference depth" treats as real. The exclusion of
 the human docs (`README.md`, `CHANGES.md`, `EVALS.md`, `INSTALL.md`,
 `tools/README.md`) rests on a sentence that does not stretch to cover it: those