- Add astrai/config/cli.py: OptSpec tables plus apply_specs infer click types and defaults from config fields, covering Optional[X], Union[X, None], PEP 604 X | None, stringified PEP 563 annotations, bool flag pairs, and repeatable list options
- Move GroupedCommand/GroupedOption and the three-layer YAML merge (option defaults < YAML < explicit CLI) into the config package, adding unknown-key warning and mapping validation
- Replace ~420 lines of hand-written @opt decorators in scripts/tools/train.py with a 66-entry spec table; option names, defaults, flag styles, and YAML semantics verified unchanged
- Migrate scripts/tools/server.py to the same mechanism with its section binding, integer coercion, and dtype validation preserved locally
- Add tests/config/test_cli.py covering type inference across annotation styles, default overrides, flag pairs, merge precedence, scientific notation, and help ordering
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