Agent Hub platform: a centralized hub for discovering, installing, and managing GAIA agents.

Covers: gaia-agent.yaml manifest format, versioning, Python wheel + C++ binary packaging, R2 cloud distribution, install/update/rollback API, Agent Hub UI (Installed/Available tabs with hardware compatibility checks), developer workflow (init/test/pack/publish), security tiers, and 5-interface standard (TUI, CLI, pipe, API server, MCP server) per agent package.

Plan: docs/plans/agent-hub-ui.mdx