feat(release): CI matrix, PyPI trusted-publishing pipeline, registry manifest, Docker fix

- ci.yml: ruff lint/format, Linux 3.11/3.12 tests + coverage, Windows mocked-COM leg, package build + clean-venv wheel smoke, Docker smoke, server.json schema validation
- release.yml: tag -> test gate -> tag/version check -> build -> PyPI trusted publishing (OIDC) -> GitHub Release
- pyproject: SPDX license, authors, keywords, classifiers, project URLs, autocad-mcp-pro console alias; version 1.4.0
- Dockerfile: ship engineering/ + version.py (image previously missed both -> engineering tools failed in containers); healthcheck imports engineering
- server.json: MCP registry manifest (io.github.u-c4n/autocad-mcp, pypi package)
- docs/RELEASE-DISTRIBUTION.md: one-time owner actions (PyPI trusted publisher, mcp-publisher login) + directory submissions runbook

Co-authored-by: Cursor <cursoragent@cursor.com>

Dockerfile

@@ -4,9 +4,10 @@ WORKDIR /app
 
 RUN useradd --create-home --shell /bin/bash mcp
 
-COPY pyproject.toml ./
-COPY server.py config.py security.py ./
+COPY pyproject.toml README.md LICENSE ./
+COPY server.py config.py security.py version.py ./
 COPY backends/ ./backends/
+COPY engineering/ ./engineering/
 
 RUN pip install --no-cache-dir -e .
 
@@ -15,6 +16,6 @@ USER mcp
 EXPOSE 8000
 
 HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
-    CMD python -c "import server; print('ok')" || exit 1
+    CMD python -c "import server, engineering.gear; print('ok')" || exit 1
 
 CMD ["python", "server.py"]