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

CHANGES.md

@@ -14,7 +14,7 @@ place only: `instructions/dev/version-parts.md` § The candidate model.
 
 ---
 
-## 9.0.0-beta.1 - 2026-10-06 - docs/ sorted into tutorials, how-to, reference and explanation plus an unshipped docs/dev/; explanation pages moved, developer guide moved and translated, human docs English
+## 9.0.0-beta.2 - 2026-10-06 - AGENTS.md routing line and a toc.py docstring describe docs/ as the whole human documentation
 
 **Author:** Torben Nehmer
 
@@ -31,6 +31,7 @@ place only: `instructions/dev/version-parts.md` § The candidate model.
 
 **Low impact**
 - version bump: Abschlussmeldung nennt Stichpunkt oder Themenabsatz statt pauschal Prosa
+- AGENTS.md routing line and a toc.py docstring describe docs/ as the whole human documentation
 <!-- /wikitool:bumps -->
 
 ### Doku-Gerüst nach Diátaxis unter `docs/` (#187)