v0.0.3

Published to Open VSX Registry and improved discoverability.

Added

• Open VSX Registry publishing support (ovsx CLI, npm scripts).
• PUBLISHING.md — step-by-step dual-marketplace publishing guide.
• Expanded marketplace keywords from 9 to 30 for better discoverability.

Changed

• README updated with Open VSX badge, multi-editor installation instructions, and manual VSIX install section.
• .vscodeignore updated to exclude publishing docs and build artifacts.

Install from VS Marketplace · Open VSX