docs: page-material passages name subtype templates (#117)

Files changed:
- CHANGES.md
- VERSION
- docs/language-boundaries.md
- tools/chemenu/commands/dist_cmd.py
- types/type-guidance.md
- types/type-spec.md

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

docs/language-boundaries.md

@@ -90,7 +90,9 @@ Making the control plane English does not make the instance's language an implem
 experiences:
 
 - **Page text.** Every page under `kb/`, and inside the page type-specs exactly the parts that
-  become page text - each one's `## Template` block and its `layout:` titles.
+  become page text - each one's `## Template` block, its `layout:` titles, and the subtype
+  templates `types/<name>.<value>.md` beside it, which are page text from the first line to the
+  last.
 - **What an agent says.** An agent speaks the KB language, whatever the file it just read was
   written in. An instruction that models a sentence for the operator writes that model in
   English, like the rest of the control plane, and the agent delivers it in the instance's
@@ -103,8 +105,8 @@ English instructions. The English is what the machinery is written in, not what
 
 A page type's contract is where the two languages meet most closely, and it is worth knowing
 which part is which before editing any of it. Its authoring guidance addresses an agent and is
-English; its `## Template` block and `layout:` titles become the literal headings of pages and
-follow the KB language; its field names and enum values are identifiers and are translated in
+English; its `## Template` block, `layout:` titles and subtype templates become the literal
+headings of pages and follow the KB language; its field names and enum values are identifiers and are translated in
 neither direction.
 
 The language line did not move when the *file* line did. A `root: kb` type-spec may now put its