Development environments for your cloud agents

Introduced multi-repo environments for cloud agents, allowing agents to reason across multiple codebases. Enhanced environment configuration with Dockerfile support, build secrets for secure registry access, and improved layer caching for faster rebuilds (70% faster). Improved agent-led environment setup with interactive configuration, credential validation, and fallback to a base image. Added environment governance features like version history, rollback permissions, audit logs, and scoped egress/secrets for enhanced security and control.