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/gtd/COLLECTION.md

@@ -0,0 +1,78 @@
+---
+profile: none
+outbound:
+  entities: [see-also]
+  concepts: [see-also]
+  sources: [see-also]
+  gtd: [see-also]
+required_by_stack: true
+---
+
+# kb/gtd/ - Collection Contract
+
+One page per committed initiative (a project in the GTD sense): the goal, the participants, the
+durable status, the open loops. This is the half of Muster 4 that `kb/` owns - the other half,
+the moment-to-moment task list, lives in the task tracker and is joined to a page here only by
+name (`AGENTS.md` invariant 8, § "Two truths about status are forbidden").
+
+**Quality goal:** a page here should still make sense once the initiative is over. A reader
+should come away knowing what was attempted, who was in it, what was decided, and what was
+learned - not a snapshot of what was still open at some point in time.
+
+Inherits [kb/CONTRACT.md](../CONTRACT.md) for the rules the stack enforces - linking mechanics,
+provenance, citation, the confidence machinery - and
+[kb/CONVENTIONS.md](../CONVENTIONS.md) for what this instance decided: language, naming forms,
+tone, relationship labels, the hedging rule. Neither is restated here.
+
+**This collection is `required_by_stack`.** A type-spec declaring `name: project` whose schema
+requires `state:` must exist (`types/type-spec.md` § "What the stack still requires of the type
+layer"), and `kb/gtd/` is whichever collection that type writes into - derived, not hardcoded, so
+renaming it stays consistent instead of tripping a stale name.
+
+## Types offered
+
+`project` (`tools/wikitool types describe project`). The `responsibility:` field selects the
+area:
+
+| Area | Holds |
+|------|-------|
+| `haus/` | Household initiatives |
+| `finanzen/` | Financial initiatives |
+| `technik/` | Technical initiatives outside any tracked codebase's own scope |
+
+These are areas, not collections: they inherit this contract and carry no `COLLECTION.md` of
+their own. The initial three values are this instance's own starting vocabulary
+(`types/project.md` § Frontmatter) - not a stack requirement, and free to extend.
+
+## Two rules unique to this collection
+
+- **`## Status` is durable, never a momentary state (D7).** The page never summarizes the task
+  list. "Pilotbetrieb seit 2026-03, zwei Abteilungen angebunden" is a status; "warte auf
+  Freigabe" is a tracker state and does not belong here. The join between a page and its tracker
+  project happens at read time, over the normalized title, and is never stored.
+- **`## Beteiligte` carries mentions, not links (D28).** One to two lines per person, in prose,
+  with no `[[wikilink]]` and no page of their own. This is a deliberate, named exception to
+  `kb/CONTRACT.md` § "Every page should" - a project page with unlinked people in its
+  `## Beteiligte` section is conforming, not incomplete. A person earns their own page, and the
+  mention becomes an edge, only once they matter for the knowledge independent of this one
+  initiative.
+
+## Authorised labels
+
+Only `see-also` is authorised in every direction for now. The vocabulary a participation edge
+(person -> project) would use is a deliberate later addition, not an oversight - adding it is a
+collection-contract change made when that label exists, not a way around a refusal.
+
+## Outbound linking
+
+A project page links to the entities and concepts its initiative actually touches - the codebase
+it ships, the system it changes, the concept it applies - and to other project pages it depends
+on or was split from.
+
+## What does not belong here
+
+- A summary of the tracker's current task list. The tracker owns tasks; this page owns the
+  initiative's durable memory.
+- A person's own page reached from `## Beteiligte` - see above.
+- An initiative's *artifact* - the codebase, system or tool it is about. That is `entity`
+  (`kb/entities/COLLECTION.md`), a different page under a different type.