docs: ausgelieferte Doku zitiert keine Issue-Nummern mehr, docs verify prueft es (schliesst #77)

Files changed:
- .gitignore
- CHANGES.md
- EVALS.md
- INSTALL.md
- README.md
- VERSION
- docs/pipeline-rationale.md
- instructions/CONTRACT.md
- instructions/bootstrap.md
- instructions/dev/issue-tracking.md
- instructions/evolve-subtypes.md
- instructions/kb-profiles.md
- instructions/mcp-read-server.md
- instructions/wiki-ingest/SKILL.md
- kb/CONTRACT.md
- kb/concepts/COLLECTION.md
- kb/sources/COLLECTION.md
- raw/CONTRACT.md
- tools/.coveragerc
- tools/CONTRACT.md
- tools/README.md
- tools/chemenu/commands/docs_verify.py
- tools/chemenu/tests/test_docs_verify.py
- types/source.schema.yaml
- types/type-spec.md

instructions/kb-profiles.md

@@ -167,7 +167,7 @@ Adopting one means copying the value list into `types/source.schema.yaml`'s enum
 value a `layout:` line in `types/source.md` - the same "copy the text in, do not point at this
 page" rule as every other profile here. Keep the visible catch-all value (`unclassified` above)
 in whatever list is adopted: a subtype field without one silently reintroduces the old
-`default:`-driven collection point that Gitea #66 removed the moment nobody names an edge case.
+`default:`-driven collection point this stack removed, the moment nobody names an edge case.
 Growing the list later, or draining the catch-all, is
 [evolve-subtypes.md](evolve-subtypes.md).