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

types/type-guidance.md

@@ -47,8 +47,8 @@ that file's own `guidance:` frontmatter field.
 - `tools/wikitool types describe <name>` composes both halves into one answer; an agent asking
   for a type's contract never needs to know it comes from two files
 - Written in the control plane's English ([AGENTS.md](../AGENTS.md) § File naming), like a
-  type-spec's own authoring prose - only the type-spec's `## Template` block and its `layout:`
-  titles are page material
+  type-spec's own authoring prose - only the type-spec's `## Template` block, its `layout:`
+  titles and its subtype templates (`types/<name>.<value>.md`) are page material
 
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