0.159.0

• Fix spawn_agent details to include the agent's configured variant; it was only sent when the LLM passed the variant argument explicitly.
• Add gpt-6-astra support: built-in variants low, medium, high, xhigh, max (no none), Codex Lite/context fallbacks, web search and image generation.
• Fix directory_tree hiding gitignored files but not their directories (e.g. .git, target); listing an ignored dir directly now shows its contents.
• Honor no_proxy/NO_PROXY when routing HTTP and HTTPS requests through environment-configured proxies. #583
• Stop retrying provider 429 errors that report exhausted usage or billing quota. #405
• Add /agent to switch a chat's primary agent without resetting its established model or variant. #428
• Add autoCompactTokensLeft to auto-compact when a fixed number of context tokens remain instead of a percentage. #582
• Add view_image tool so the agent can load png/jpg/gif/webp files from disk into context as images for models with image input.