docs toc/verify: die .template-Form einer Referenzdatei steht im Dateisatz, Version 6.0.1 freigegeben (schliesst #106)

Files changed:
- CHANGES.md
- VERSION
- instructions/dev/doc-pull-through.md
- kb/CONVENTIONS.md.template
- tools/CONTRACT.md
- tools/chemenu/commands/docs_verify.py
- tools/chemenu/tests/test_docs_verify.py
- tools/chemenu/tests/test_toc.py
- tools/chemenu/toc.py

kb/CONVENTIONS.md.template

@@ -25,6 +25,18 @@ The frontmatter above is the one machine-read part. `sections:` names the headin
 generated regions render under. Safe to change at any time - each region is located by its
 marker pair, so a rename re-renders words and nothing else.
 
+<!-- wikitool:toc -->
+## Contents
+
+- [Language](#language)
+  - [Section headings](#section-headings)
+- [Naming](#naming)
+- [Tone](#tone)
+- [Relationship labels](#relationship-labels)
+- [Hedging](#hedging)
+- [Keeping this file honest](#keeping-this-file-honest)
+<!-- /wikitool:toc -->
+
 ## Language
 
 Pages are written in **{language}** - the `language:` in this file's own frontmatter, and the