Built In provider, specialist mentions, settings polish

This release rebuilds the chat proxy so Zephyr Built In keeps working after you close and reopen the app, lets specialists tag each other directly into a channel, and clears up a round of fixes for provider settings, modal layouts, and chat rendering.

Zephyr Built In stays working after relaunch

Model routing has been rebuilt to keep every supported provider working — OpenAI, Anthropic, OpenRouter, generic OpenAI-compatible endpoints, Hugging Face, Cloudflare Workers AI, and Zephyr Built In itself — while preserving Zephyr’s policy, retry, timeout, and usage behavior. The biggest user-visible win: after a relaunch, channel routing remembers which specialists belong to which channel, so Built In keeps responding without needing you to reopen anything. The Zephyr Built In settings panel also has tighter rows so you can scan provider state at a glance.

Specialists can mention specialists

Specialists now have a real roster lookup. When a specialist tags another specialist, we look in the channel first, then your workspace, then your local catalog and the marketplace, so the mention always finds the right teammate. The mention is saved with the message, the tagged specialist is added to the channel, and they take their turn — turning an @-mention into an actual hand-off rather than just text. Specialists are also prompted to answer directly when they themselves are the one being asked, so you no longer get “I’ll go ask myself” loops.

The Specialist IQ indicator in the specialist builder is now a click-driven popover instead of a hover card. It floats cleanly above the layout, no more divider lines bleeding through, no more clickable content trapped behind it, and it closes properly after you trigger Fix or Details.

Provider settings stop bouncing on toggle changes

Provider role toggles in settings now save reliably instead of failing on click, so flipping fallback or workspace-disabled state takes effect immediately. The fix is covered with focused tests so the regression cannot creep back.

Polish & fixes

• The Create Project and Edit Project modals now pin Cancel and Create to the bottom of the scroll area, so the action buttons stay visible even on long forms.
• Markdown responses in chat no longer leave oversized vertical gaps between blocks when the source has blank lines, while preserved whitespace still renders correctly for mention highlights.