SMF-PR5: Add canonical platform metadata lint gate #262

Job	Run time
Lint & format	6s
Release artifacts in sync (PR 7.2.1)	41s
Validate lead scoring dataset	33s
Type check	41s
Validate v6 lead scoring dataset	40s
Execute release notebooks (G13.1)	1m 12s
Tests (Python 3.12)	3m 23s
Validate v7 lead scoring dataset	39s
Tests (Python 3.11)	3m 24s
	11m 19s

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