stack: Typ project und Collection kb/gtd/ (#123)

Files changed:
- CHANGES.md
- README.md
- VERSION
- kb/CONTRACT.md
- kb/CONVENTIONS.md
- kb/entities/COLLECTION.md
- kb/gtd/COLLECTION.md
- kb/gtd/INDEX.md
- kb/index.md
- tools/CONTRACT.md
- tools/chemenu/kb_collections.py
- tools/chemenu/tests/test_conventions.py
- tools/chemenu/tests/test_docs_verify.py
- tools/chemenu/tests/test_kb_collections.py
- tools/chemenu/tests/test_new_page.py
- tools/chemenu/tests/test_type_resolver.py
- tools/chemenu/tests/test_types_cmd.py
- types/project.md
- types/project.schema.yaml
- types/type-spec.md

kb/index.md

@@ -17,6 +17,7 @@ The page tables live in a generated `INDEX.md` inside each collection, linked be
 - **Comparisons:** 1
 - **Concepts:** 80
 - **Entities:** 72
+- **Gtd:** 0
 - **Sources:** 29
 - **Last Updated:** 2026-09-19
 
@@ -29,6 +30,7 @@ The page tables live in a generated `INDEX.md` inside each collection, linked be
 | `comparisons/` | 1 | [comparisons/INDEX.md](comparisons/INDEX.md) |
 | `concepts/` | 80 | [concepts/INDEX.md](concepts/INDEX.md) |
 | `entities/` | 72 | [entities/INDEX.md](entities/INDEX.md) |
+| `gtd/` | 0 | [gtd/INDEX.md](gtd/INDEX.md) |
 | `sources/` | 29 | [sources/INDEX.md](sources/INDEX.md) |
 
 ### concepts/