v0.preview.59

v0.preview.59 - 2026-07-16

• Add a --no-session-save CLI flag that skips session event logs and resumable snapshots for TUI and headless sessions, and propagates to subagents
• Add a --short-prompt option (CLI flag and settings.json) that uses compact tool descriptions to shrink the system prompt
• Add xAI Grok 4.5 support to Antix
• Support GPT-5.6 on OpenAI subscriptions
• Dependency updates