Reflect that path configuration is now optional in most cases.
Add Auto-detect as a recommended first step when agents are not found.
Add multi-device vault sync section to troubleshooting.
Introduces a full documentation site under docs/ using VitePress, including configuration, custom theme, setup guides for supported agents (Claude Code, Codex, Gemini CLI, custom agents), usage instructions, FAQ, troubleshooting, and images. Updates .gitignore and .prettierignore to exclude VitePress build output and docs. Also updates package.json and eslint config for documentation support.
