v0.2.0

What's Changed

• Upgrade MCP tools with ACI-optimized design and full mindmap lifecycle (list / get / cleanup)
• Add server-side image export (PNG / JPG / SVG) via Playwright
• Introduce tri-state open mode (always / never / agent) and return modes (path / content / both)
• Add CLI flags and env vars: --open / MARKMAP_OPEN, --offline / MARKMAP_OFFLINE, --return-mode / MARKMAP_RETURN_MODE
• Change default output directory to ~/.markmap-mcp
• Add in-browser export toolbar and mindmap_from_content prompt
• Expand unit test coverage and update EN/ZH documentation

Full Changelog: v0.1.1...v0.2.0