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

.gitignore

@@ -134,7 +134,7 @@ npm-debug.log*
 /.agents/skills/
 /.claude/skills/
 
-# Ingest inbox (see raw/CONTRACT.md and Gitea #58, flattened by #67). A human
+# Ingest inbox (see raw/CONTRACT.md "Getting a file in"). A human
 # drops a file here - no subdirectory carries any meaning any more, an old
 # one is merely tolerated and ignored; `wikitool raw accept` promotes it into
 # `raw/`, computing the date-sharded directory and any bundle from what was