test(git-delivery): restore #475 coverage gate + validator-totality hardening (Refs #475) #2443

Job	Run time
actionlint	7s
Cross-platform smoke (windows-latest)	5m 4s
ui	8m 19s
Protected branch gate	2s
ci	1m 41s
Build, scan, SBOM, smoke	7m 30s
Cross-platform smoke (macos-latest)	2m 56s
Verify pinned action SHAs	6s
	25m 45s

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