Restores #5151 (north-star + batch 1 + crewai-flows + llamaindex),
#5196 (pydantic-ai), #5205 (a2a-middleware), #5211 (mcp-apps), reconciled
onto the current main baseline rather than the pre-revert tree:
- keep main's 1.59.3 pins, AGENT_URL normalization, default agent keys,
useConfigureSuggestions, available:false, useRenderTool
status/parameters API, call-time agent.state reads, and crewai-crews'
rebuilt page (not yet threads-migrated)
- graft the threads layer (drawer/gate/provider, env-gated route
intelligence block, next.config gate, env docs, drawer deps) on top
- drop threads-era sidebar suggestions props where main now registers
suggestions via useConfigureSuggestions (or omits them)
- fix the stale pydantic-ai doc link main reintroduced in ms-af-dotnet
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>