Release 0.3.0

Added

• Grouped CLI commands (FE-09) — GroupedModuleGroup organizes modules into nested subcommand groups by namespace prefix, enabling apcore-cli <group> <command> invocation.
• Display overlay helpers — get_display() and get_cli_display_fields() resolve alias, description, and tags from metadata["display"].
• Init command (FE-10) — apcore-cli init module <id> scaffolds new modules with --style (decorator/convention/binding), --dir, and --description options.
• Grouped shell completions — Bash, Zsh, and Fish completions now support two-level group/command completion via _APCORE_GRP.
• Optional apcore-toolkit integration — DisplayResolver and RegistryWriter via toolkit feature flag with graceful fallback.
• Path traversal validation — --dir rejects paths containing .. components.

Changed

• BUILTIN_COMMANDS updated to include init (6 items, sorted).
• APCORE_AUTH_API_KEY added to man page ENVIRONMENT section.
• Dependency bump: apcore >= 0.14.