What are 'Undercover Mode', 'autoDream' features revealed in Claude Code leak?

Anthropic's accidental leak of Claude Code's source code has revealed several features. According to VentureBeat, a feature called "Undercover Mode" might enable Anthropic to use Claude Code for "stealth" contributions to public open-source repositories. Another feature, called "Kairos", uses the "autoDream" process to improve the system's memory while the user is inactive.