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

instructions/upgrade-instance.md

@@ -110,7 +110,12 @@ a further checkout of this one ([bootstrap.md](bootstrap.md)).
    - adopting it (copying it to the unsuffixed name) is the instance's own act, and where the
    stack *requires* that type the omission is what step 9's `docs verify` refuses. Step 2's
    **Breaking Change:** line says when a release is in that shape; step 9 has the repair.
-   `locally changed` is step 6. `removed` matters only if `--prune` is wanted, which is optional
+   One more shape of `new` needs no decision at all: a subtype template
+   `types/<type>.<value>.md.template` beside a type this instance has already adopted. Adopt it
+   (`tools/wikitool dist adopt types/<type>.<value>.md.template`) and `wikitool new` scaffolds
+   pages of that subtype from it; leave it lying and they keep the type's `## Template` block.
+   Both are valid - [subtype-templates.md](subtype-templates.md) is how to judge whether the
+   corpus wants it. `locally changed` is step 6. `removed` matters only if `--prune` is wanted, which is optional
    and never required.
 
 6. **Only if a file is reported as locally changed: decide whose file it is, then reconcile it.**