feat(wfctl): discover manifest-driven secrets #2785

Job	Run time
Verify removed AWS SDK packages are not imported (issue	5s
Cloud-SDK inventory + k8s-backend init() partition + asymmetric graph audit	22s
Go Mod Tidy	22s
Verify godo is not imported (issue	4s
UI Tests	28s
Lint	4m 51s
Test (Go 1.26)	9m 45s
Lint Examples	2m 26s
Build Examples	2m 22s
Build	3m 19s
Validate Example Configs	7m 40s
	31m 44s

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