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

instructions/CONTRACT.md

@@ -9,6 +9,23 @@ instead of action.
 `instructions/` is not a pipeline stage and not a collection. It is part of the control plane,
 alongside [AGENTS.md](../AGENTS.md).
 
+<!-- wikitool:toc -->
+## Contents
+
+- [Two forms, three reference tiers](#two-forms-three-reference-tiers)
+- [`instructions/migrations/`](#instructionsmigrations)
+- [`instructions/dev/`](#instructionsdev)
+- [Publishing](#publishing)
+- [Writing an instruction](#writing-an-instruction)
+  - [A skill's H1 is a name, not an imperative](#a-skills-h1-is-a-name-not-an-imperative)
+  - [Reference depth: bundled files, not repo-wide contracts](#reference-depth-bundled-files-not-repo-wide-contracts)
+  - [When a skill carries a copy-in checklist](#when-a-skill-carries-a-copy-in-checklist)
+  - [How much reasoning a step may carry](#how-much-reasoning-a-step-may-carry)
+- [Instruction duality](#instruction-duality)
+- [Single source](#single-source)
+- [What does not belong here](#what-does-not-belong-here)
+<!-- /wikitool:toc -->
+
 ## Two forms, three reference tiers
 
 | Form | File | Loaded by |