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/CONTRACT.md

@@ -80,12 +80,13 @@ resolves against it by name.
 
 | Collection | Holds | Contract |
 |------------|-------|----------|
-| `kb/entities/` | Concrete things: projects, deployed systems, tools, technologies, people | [entities/COLLECTION.md](entities/COLLECTION.md) |
+| `kb/entities/` | Concrete things: codebases, deployed systems, tools, technologies, people | [entities/COLLECTION.md](entities/COLLECTION.md) |
 | `kb/concepts/` | Architectures, patterns, protocols, workflows, decisions, recurring problems | [concepts/COLLECTION.md](concepts/COLLECTION.md) |
 | `kb/sources/` | One summary page per ingested source, carrying its `raw_files:` provenance | [sources/COLLECTION.md](sources/COLLECTION.md) |
 | `kb/comparisons/` | Structured comparisons of two or more existing pages | [comparisons/COLLECTION.md](comparisons/COLLECTION.md) |
+| `kb/gtd/` | One page per committed initiative (a GTD project): goal, participants, durable status, open loops | [gtd/COLLECTION.md](gtd/COLLECTION.md) |
 
-The four rows above are this instance's collections, not a fixed set. **Adding one:**
+The five rows above are this instance's collections, not a fixed set. **Adding one:**
 `mkdir kb/<name>` and write a `kb/<name>/COLLECTION.md` with the two fields above. Collections
 are discovered by contract presence, so no code change is needed. A collection only becomes
 *writable* once some type-spec declares a matching `base_dir:`. Renaming or dropping one is the