Treat an existing core config as the startup source of truth instead of rebuilding it from the example template. Preserve arbitrary user-defined top-level fields, nested mappings, lists, provider settings, comments, and WebUI-installed plugin metadata while applying only GUI-managed settings. Support correctly indented insertion of deeply nested YAML mappings during upgrade migrations and add broad regression coverage.
- split Tauri business logic out of main.rs by domain
- separate agent and core configuration submodules
- organize Rust tests by feature with shared test support
- split frontend locale resources
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