Antigravity CLI 1.2.17

[Improvements] Improved the Windows command sandbox so sandboxed commands no longer need administrator rights, and common tools such as Python, Git, and npm work inside the sandbox out of the box.

[Improvements] Added announcement cards above the prompt for model launches, deprecations, and other service notices. Cards appear one at a time, newest first; press Esc on an empty prompt to dismiss the current card permanently and show the next one, and sending a message hides the card for the rest of the session.

[Fixes] Fixed markdown table columns drifting out of alignment when a cell contains emoji such as ⚠️ or 👍🏽 or scripts with combining characters such as Hindi, which affected every session over SSH or inside tmux.

[Fixes] Fixed .tiff images being reported with the wrong file type and silently converted to PNG when the agent viewed them.