feat: initial v0.1.0 of mcp-sonarqube-proxy

Stdio MCP server that proxies tools from an upstream SonarQube MCP server
over streamable HTTP. Tools are forwarded 1:1 with full schema preservation
(inputSchema, outputSchema, annotations, title, _meta); CallToolResult is
forwarded including isError and structuredContent.

- proxy.py: persistent upstream ClientSession, low-level Server with
  @list_tools and @call_tool(validate_input=False) handlers — the upstream
  is the sole schema authority.
- cli.py: Click-based 'serve' (stdio) and 'check' (probe) commands;
  logging strictly on stderr (stdout reserved for JSON-RPC).
- Targets mcp 1.27.x decorator API (pinned <2 to guard against the
  unreleased constructor-API rewrite on main).
- pytest suite (14 tests) covering env-var resolution, schema passthrough,
  CallToolResult forwarding, registration, dispatch end-to-end, and CLI
  success/error paths.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,49 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+
+# Distribution / packaging
+build/
+dist/
+*.egg-info/
+*.egg
+wheels/
+.eggs/
+
+# Virtual environments
+.venv/
+venv/
+env/
+ENV/
+
+# uv
+.uv/
+uv.lock
+
+# Testing
+.pytest_cache/
+.coverage
+.coverage.*
+htmlcov/
+.tox/
+.nox/
+
+# Type checkers / linters
+.mypy_cache/
+.ruff_cache/
+.pyright/
+
+# Editors
+.vscode/
+.idea/
+*.swp
+*.swo
+.DS_Store
+Thumbs.db
+
+# Environment files
+.env
+.env.local