feat: a subtype gets its own page skeleton from types/<type>.<value>.md (#117)

Files changed:
- AGENTS.md
- CHANGES.md
- README.md
- VERSION
- docs/ownership-and-templates.md
- instructions/evolve-subtypes.md
- instructions/setup-instance.md
- instructions/subtype-templates.md
- instructions/upgrade-instance.md
- tools/CONTRACT.md
- tools/chemenu/commands/dist_cmd.py
- tools/chemenu/commands/docs_verify.py
- tools/chemenu/commands/new_page.py
- tools/chemenu/tests/test_dist_cmd.py
- tools/chemenu/tests/test_docs_verify.py
- tools/chemenu/tests/test_new_page.py
- tools/chemenu/tests/test_toc.py
- tools/chemenu/tests/test_type_resolver.py
- tools/chemenu/toc.py
- tools/chemenu/type_resolver.py
- types/concept.decision.md
- types/entity.guidance.md
- types/entity.md
- types/entity.person.md
- types/type-spec.md

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

AGENTS.md

@@ -102,6 +102,7 @@ What a file is called says who it is for and how it is loaded. This is a rule, n
 | `instructions/<name>/SKILL.md` | Agents | By the harness, once published |
 | `types/<name>.md` | Agents + validator | Via `tools/wikitool types describe`. Split by `root:`: a page type-spec (`root: kb`) belongs to the instance and ships as `.template`; one describing a stack artifact ships verbatim |
 | `types/<name>.guidance.md` | Agents + validator | Via `tools/wikitool types describe`, composed with the `types/<name>.md` it documents. Stack-owned regardless of the type-spec's own `root:` - it ships verbatim and is optional, present only where the type-spec declares `guidance:` |
+| `types/<name>.<subtype>.md` | Agents + `new` | Never as instruction: `wikitool new` copies it as the page skeleton for that one subtype value, in place of the type-spec's `## Template` block. Page material in the KB language, no frontmatter; its name is its only declaration, and `guidance` is reserved. Owned like the type-spec beside it, so it ships as `.template` |
 | `docs/<name>.md` | Agents and humans | By link, or on explicit request - never automatically, and never as instruction |
 | `INDEX.md` | Both | Generated - never hand-edited |