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>

.github/workflows/ci.yml

@@ -0,0 +1,110 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - run: pip install ruff
+      - run: ruff check .
+      - run: ruff format --check .
+
+  test-linux:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11", "3.12"]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          pip install -e ".[pdf]"
+          pip install pytest pytest-asyncio pytest-cov
+      - name: Run tests
+        run: pytest --cov=. --cov-report=xml --cov-report=term-missing -v
+      - name: Upload coverage
+        if: matrix.python-version == '3.11'
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: coverage.xml
+
+  test-windows:
+    # Windows leg exercises the mocked-COM suite on the platform the COM
+    # backend actually targets (pywin32 installs; no live AutoCAD needed).
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Install dependencies
+        run: |
+          pip install -e ".[full]"
+          pip install pytest pytest-asyncio pytest-cov
+      - name: Run tests
+        run: pytest -v
+
+  package:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Build sdist and wheel
+        run: |
+          pip install build twine
+          python -m build
+          twine check dist/*
+      - name: Install wheel in a clean venv and smoke test
+        run: |
+          python -m venv /tmp/smoke
+          /tmp/smoke/bin/pip install dist/*.whl
+          /tmp/smoke/bin/autocad-mcp --help
+          /tmp/smoke/bin/python -c "import server, config, security, version, backends, engineering; print('wheel ok', version.__version__)"
+      - name: Upload distributions
+        uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: dist/
+
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build image
+        run: docker build -t autocad-mcp:ci .
+      - name: Smoke test image
+        run: docker run --rm autocad-mcp:ci python -c "import server, engineering.gear, version; print('docker ok', version.__version__)"
+
+  registry-validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Validate server.json against MCP registry schema
+        if: ${{ hashFiles('server.json') != '' }}
+        run: |
+          pip install check-jsonschema
+          check-jsonschema --schemafile https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json server.json