0.21.0

Features

• Design spaces — a canvas tab for visual work. Ask for a mockup and Raven builds it as live frames you can preview and interact with, browse from the designs hub, and @-reference in chat so the agent knows what you're looking at.
• Tab strip — drag tabs to reorder them, and press ⌘T for the new-tab menu with 1–5 to pick a substrate.
• Simulators — every iOS simulator is now provisioned and owned by Raven, so a space always gets the newest iPhone, and the serve helper heals itself instead of hanging.

Fixes

• Chat history — opening a space while it's still streaming no longer discards the conversation above.
• Terminal and environment — Cmd+A selects the buffer, copied text keeps its trimming, and Raven stops leaking a build variable into your shells and agent sessions where it broke tooling with a confusing binary mismatch.