Add Cursor Cloud specific instructions to AGENTS.md

[yasserfaraazkhan]

Adds a ## Cursor Cloud specific instructions section to AGENTS.md with environment setup notes for cloud agents:

• Documents that Node.js v20.15.0 and npm are pre-installed
• Notes chrome-sandbox SUID permission requirement on Linux
• Documents how to run the app in headless environments
• Lists expected dbus warnings and modal rendering limitations
• References key commands from existing documentation

This helps future cloud agents quickly set up and run the Mattermost Desktop app without re-discovering these environment-specific details.

  

[mm-cloud-bot]

@yasserfaraazkhan: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

Details

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