Rename CLI command from `aai` to `assembly` #271

Job	Run time
pip-audit (dependency CVEs)	26s
brew style (Homebrew formula)	1m 1s
pre-commit	1m 38s
build + twine check	17s
lint + typecheck + tests (py3.13)	3m 7s
lint + typecheck + tests (py3.12)	2m 50s
package install — real (macos-latest)	49s
package install — real (ubuntu-latest)	1m 13s
brew install (real, macOS)	10m 6s
lint + typecheck + tests	2s
	21m 29s

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