feat(lifecycle): early-pLTV (tenure-anchored) snapshot [LTV-Pm] #365

Job	Run time
Validate lead scoring dataset	35s
Tests (Python 3.12)	4m 14s
Release artifacts in sync (PR 7.2.1)	42s
Type check	44s
Validate v7 lead scoring dataset	44s
Lint & format	11s
Execute release notebooks (G13.1)	1m 19s
Tests (Python 3.11)	2m 20s
Validate v6 lead scoring dataset	44s
	11m 33s

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