Plugin 0.2.9: Start no longer interpolates workspace paths into the shell command. Launch is a working directory plus argv recipe; nested cd uses ./ so CDPATH cannot redirect it. Scoped package dirs (packages/@acme/web) stay startable. Agent preview_app cannot pass an arbitrary command. preview_ports share/unshare/kill wait for a BB confirmation that echoes a plugin-issued token. README discloses install, script execution, signaling, and Connect.
Marketplace #194 now installs ^0.2.9 and ships overview/app-preview.md.