Tau 0.4.0

New

• Run tool-capable GGUF models through Tau's built-in llama.cpp local backend, with the /local workflow for endpoint configuration, diagnostics, model discovery, downloads, and load or unload management.
• Keep model metadata current from models.dev with a generated offline snapshot, background /model refreshes, tau update --models, richer capability metadata, and Pi-compatible reasoning levels including max.
• Recover eligible Hugging Face pre-output route failures automatically, persist successful replacement routes, and expose structured failover diagnostics while preserving explicitly fixed routes.
• Build dynamic providers from trusted extensions and let extensions add live sidebar sections, structured system-prompt sections, and react to session-name or thinking-level changes.
• Show active SYSTEM.md and APPEND_SYSTEM.md sources in the TUI sidebar.

Changed

• Render /system output as transcript Markdown without adding it to model context or session history.
• Compose all discovered user and project APPEND_SYSTEM.md files from broad to specific before explicit CLI append content, deduplicating overlapping paths across reloads.

Fixed

• Require explicit Google finish reasons, retry empty clean closes, preserve partial failures, and reject malformed stream chunks instead of treating incomplete streams as successful.
• Prevent malformed syntax-highlighter spans from crashing the TUI when rendering fenced code blocks.
• Update extension-owned sidebar content in place to prevent flicker and unnecessary widget remounts.

Full changelog: v0.3.13...v0.4.0