Improve CLI UX: enums, validation, help panels, and completions #182

Job	Run time
brew style (Homebrew formula)	51s
pip-audit (dependency CVEs)	23s
build + twine check	15s
pre-commit	1m 34s
install.sh real install (ubuntu-latest)	1m 0s
lint + typecheck + tests (py3.13)	2m 35s
lint + typecheck + tests (py3.12)	2m 37s
install.sh real install (macos-latest)	42s
lint + typecheck + tests	3s
	10m 0s

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