v1.0.0

First Marketplace-ready release of Plane by MasteryHub.

• Publisher id MasteryHubITS
• Default server is Plane Cloud; custom self-hosted URL for other instances
• Screenshots in the README
• GitHub Release runs vsce + Open VSX publish (VSCE_PAT / OVSX_PAT)

Install from the .vsix below until the Marketplace listing is live.