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feat: add JSON validation CLI command (validate-json) #40

Job	Run time
Security (pip-audit on Ubuntu)	25s
E2E Tests (gts-spec)	38s
Test Suite (windows-latest, python=3.11)	1m 21s
Code Coverage (pytest-cov)	29s
Test Suite (ubuntu-latest, python=3.11)	27s
Test Suite (macos-latest, python=3.11)	35s
	3m 55s