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Expanded and modernized the README to reflect PKGMGR's purpose as a multi-distro development and packaging orchestrator. Added explanations for Nix-based cross-distro workflows, clarified installation steps, documented the full CLI capabilities, and embedded the architecture diagram. Also replaced the verbose CLI DESCRIPTION_TEXT with a concise summary suitable for `--help` output. Included updated `assets/map.png`. https://chatgpt.com/share/693b1d71-ca08-800f-a000-f3be49f7efb5