feat: MCP-Leseserver, Bibliotheksgrenze, Haertung des Lesepfads, Publish-Remote-Gate scharf (2.4.0)

Files changed:
- .gitea/workflows/ci.yml
- CHANGES.md
- README.md
- VERSION
- instructions/mcp-read-server.md
- tools/CONTRACT.md
- tools/README.md
- tools/chemenu/api.py
- tools/chemenu/commands/doctor.py
- tools/chemenu/commands/lint.py
- tools/chemenu/commands/search.py
- tools/chemenu/commands/types_cmd.py
- tools/chemenu/config.py
- tools/chemenu/corpus_cache.py
- tools/chemenu/errors.py
- tools/chemenu/frontmatter_io.py
- tools/chemenu/lint_core.py
- tools/chemenu/mcp/__init__.py
- tools/chemenu/mcp/__main__.py
- tools/chemenu/mcp/server.py
- tools/chemenu/page.py
- tools/chemenu/search/filters.py
- tools/chemenu/search/registry.py
- tools/chemenu/search/ripgrep.py
- tools/chemenu/search/service.py
- tools/chemenu/tests/conftest.py
- tools/chemenu/tests/test_api.py
- tools/chemenu/tests/test_corpus_cache.py
- tools/chemenu/tests/test_doctor.py
- tools/chemenu/tests/test_frontmatter_io.py
- tools/chemenu/tests/test_instructions_cmd.py
- tools/chemenu/tests/test_mcp_server.py
- tools/chemenu/tests/test_new_page.py
- tools/chemenu/tests/test_search.py
- tools/chemenu/type_resolver.py
- tools/chemenu/types_core.py
- tools/requirements-mcp.txt

tools/requirements-mcp.txt

@@ -0,0 +1,13 @@
+# The MCP read server's dependency, deliberately not in requirements.txt.
+#
+# `requirements.txt` describes what an *instance* needs to run `wikitool`, and
+# it is what `dist export` ships. The server is an optional second consumer:
+# an instance that only ever uses the CLI should not be made to install
+# pydantic, starlette, uvicorn and cryptography to do it.
+#
+#   tools/.venv/bin/pip install -r tools/requirements-mcp.txt
+#   WIKI_TRACE=0 tools/.venv/bin/python -m chemenu.mcp --transport stdio
+#
+# The tests under `chemenu/tests/test_mcp_server.py` skip without it; CI
+# installs it, so they do run.
+mcp>=2.0