docs: clarify workflow and refresh support contracts #46

Job	Run time
Validate skill source (macos-latest, 3.10)	30s
Validate skill source (macos-latest, 3.14)	16s
Validate skill source (ubuntu-latest, 3.10)	10s
Validate skill source (ubuntu-latest, 3.14)	11s
Verify external references	-1s
	1m 6s

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