April 2026: Implemented a robust fix for Devcontainer Metadata deserialization to support both JSON array and object formats, enabling attachment to docker-compose devcontainers created via the devcontainer CLI and VS Code. The change uses a dual-parsing strategy (attempt array parsing first, then fall back to a single object wrapped in a vector) and is covered by tests. Aligned with upstream devcontainer CLI changes (PR #1199) to ensure cross-tool compatibility. Key outcomes include eliminating the 'invalid type: map, expected a sequence' error, stabilizing devcontainer workflows, and improving automation readiness. Technologies exercised include Rust JSON deserialization, test-driven development, and CI validation. Business value: reduces onboarding friction, accelerates local/devcontainer workflows, and increases reliability of containerized development environments.