docs: layout comments name all four shipped layout types; #150 changelog pointer and test docstring corrected

Files changed:
- CHANGES.md
- VERSION
- tools/chemenu/commands/new_page.py
- tools/chemenu/tests/test_new_page.py
- tools/chemenu/type_resolver.py

tools/chemenu/commands/new_page.py

@@ -15,8 +15,8 @@ A schema `default:` is materialized only for a field the schema also lists
 in `required:` - an optional field's default is a reader-side assumption
 (what a missing field means), and writing it into every scaffolded page
 would turn that assumption into a stated claim instead (Gitea #109).
-Directory placement for subtype-driven types (currently just entities) also
-comes from the type-spec, via its `layout:` frontmatter (see
+Directory placement for subtype-driven types (in the shipped specs: entity,
+concept, source and project) also comes from the type-spec, via its `layout:` frontmatter (see
 `TypeResolver.get_layout`) - not a hand-maintained Python dict.
 """
 from __future__ import annotations

tools/chemenu/tests/test_new_page.py

@@ -775,8 +775,9 @@ def test_new_concept_path_matches_its_record_note(monkeypatch, kb_dir):
 def test_new_source_path_matches_its_record_note_and_its_usage_is_runnable(monkeypatch, kb_dir):
     """Also #150's second finding: the `usage` line itself omitted
     `source_type`/`fidelity`/`authority` and could never succeed as written.
-    Running the corrected `usage` verbatim (substituting `<Name>`/`<t>`/etc.)
-    is the test that it now can."""
+    The call below passes exactly the fields the corrected `usage` names,
+    with valid values for its placeholders - it does not parse the `usage`
+    string itself."""
     monkeypatch.setenv("WIKI_AUTHOR", "Torben")
     name = "gateway.example.net"
     _fixture_raw_file(monkeypatch, kb_dir, "raw/notes/gateway.example.net.md")

tools/chemenu/type_resolver.py

@@ -306,7 +306,8 @@ class TypeResolver:
         need a hand-maintained `entity_type -> subdirectory` Python dict.
 
         Only types with subtype-driven directory placement declare a
-        `layout:` (currently just `types/entity.md`); returns None for types
+        `layout:` (in the shipped specs: `types/entity.md`, `types/concept.md`,
+        `types/source.md`, `types/project.md`); returns None for types
         that don't (e.g. `types/comparison.md`, which has a single flat
         directory regardless of subtype).