Add Datadog CLI-usage dashboard + JSON validity gate #276

Job	Run time
pre-commit	1m 33s
package install — real (ubuntu-latest)	59s
brew style (Homebrew formula)	53s
pip-audit (dependency CVEs)	26s
package install — real (macos-latest)	51s
lint + typecheck + tests (py3.12)	3m 44s
brew install (real, macOS)	9m 35s
lint + typecheck + tests (py3.13)	3m 6s
build + twine check	18s
lint + typecheck + tests	4s
	21m 29s

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