docs: rewrite opening section for clarity and skimmability #47

Job	Run time
Validate skill source (ubuntu-latest, 3.14)	11s
Validate skill source (macos-latest, 3.14)	9s
Validate skill source (macos-latest, 3.10)	12s
Validate skill source (ubuntu-latest, 3.10)	13s
Verify external references	0s
	45s

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