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

tools/chemenu/commands/dist_cmd.py

@@ -748,8 +748,8 @@ def run_export(target: Path, dry_run: bool = False, origin: Optional[Origin] = N
 # The other half of the `.template` split above: an instance takes the shipped
 # default as its own by copying it to the unsuffixed name. Only the templates
 # whose shipped text is a working default are in scope - each collection's
-# contract and the page type-specs with their schemas. `kb/CONVENTIONS.md` and
-# the personalization files ship as templates too, but carry a sentinel and
+# contract and the page type-specs with their schemas and subtype templates.
+# `kb/CONVENTIONS.md` and the personalization files ship as templates too, but carry a sentinel and
 # exist to be filled in, so a verbatim copy of them would only be a file
 # `doctor` refuses; the agent writes those itself.