feat(metrics): v1.88 Metrics Phase 2 — journal evidence + enrichments + docs #740

Job	Run time
P1 - Zombie dependencies (libyear)	12s
P0 - License compliance (go-licenses)	23s
P0 - SPDX header validation (repo policy)	6s
P1 - AI hallucination guard (Lychee URL validation)	7s
Summary	2s
	50s

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