stack: TOC-Pflicht fuer Referenzdateien ueber 100 Zeilen (docs toc); session-setup.md/gates.md nennen die tatsaechliche Budget-Ausnahmeliste (schliesst #73, #76)

Files changed:
- AGENTS.md
- CHANGES.md
- VERSION
- instructions/CONTRACT.md
- instructions/capture-session.md
- instructions/claude-code-model-selection.md
- instructions/dev/issue-tracking.md
- instructions/dev/testing-conventions.md
- instructions/dev/version-parts.md
- instructions/evolve-subtypes.md
- instructions/gates.md
- instructions/german-terminology.md
- instructions/ingest-large-tree.md
- instructions/kb-profiles.md
- instructions/link-taxonomy.md
- instructions/mcp-read-server.md
- instructions/migrate-corpus.md
- instructions/migrations/3.0.0-authoring-conventions.md
- instructions/migrations/4.0.0-link-taxonomy.md
- instructions/private-instance.md
- instructions/session-setup.md
- instructions/setup-instance.md
- kb/CONTRACT.md
- kb/CONVENTIONS.md
- kb/concepts/COLLECTION.md
- raw/CONTRACT.md
- tools/CONTRACT.md
- tools/chemenu/commands/docs_verify.py
- tools/chemenu/commands/instructions_cmd.py
- tools/chemenu/tests/test_docs_verify.py
- tools/chemenu/tests/test_instructions_cmd.py
- tools/chemenu/tests/test_toc.py
- tools/chemenu/toc.py
- types/type-spec.md

kb/concepts/COLLECTION.md

@@ -23,6 +23,16 @@ provenance, citation, the confidence machinery - and
 [kb/CONVENTIONS.md](../CONVENTIONS.md) for what this instance decided: language, naming forms,
 tone, relationship labels, the confidence rubric. Neither is restated here.
 
+<!-- wikitool:toc -->
+## Contents
+
+- [Types offered](#types-offered)
+- [Decisions](#decisions)
+- [Authorised labels](#authorised-labels)
+- [Outbound linking](#outbound-linking)
+- [What does not belong here](#what-does-not-belong-here)
+<!-- /wikitool:toc -->
+
 ## Types offered
 
 `concept` (`tools/wikitool types describe concept`). Das Feld `concept_type:`