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/CONTRACT.md

@@ -28,6 +28,23 @@ looks like) are in neither - they belong to the type-specs and are printed by
 `tools/wikitool types describe <type>`. Never hand-write frontmatter; scaffold with
 `tools/wikitool new <type> --name "<Name>" --set field=value ...`.
 
+<!-- wikitool:toc -->
+## Contents
+
+- [Collections](#collections)
+- [Generated files](#generated-files)
+- [Titles are identifiers](#titles-are-identifiers)
+- [Every page should](#every-page-should)
+- [Quotation cap](#quotation-cap)
+- [Language and identifiers](#language-and-identifiers)
+  - [Generated regions](#generated-regions)
+- [Linking](#linking)
+- [Provenance and citation](#provenance-and-citation)
+- [Confidence](#confidence)
+  - [Confidence against source standing](#confidence-against-source-standing)
+- [What does not belong here](#what-does-not-belong-here)
+<!-- /wikitool:toc -->
+
 ## Collections
 
 `kb/` is a **namespace, not a collection**. It carries no `COLLECTION.md` of its own.