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Add portable Workflow assistant example #3395

Job	Run time
UI Tests	21s
Go Mod Tidy	28s
Verify godo is not imported (issue	2m 4s
Verify removed AWS SDK packages are not imported (issue	8s
Public Workflow Policy	2m 42s
Cloud-SDK inventory + Kubernetes backend boundary + asymmetric graph audit	33s
Lint Examples	1m 32s
Validate Example Configs	7m 43s
Build Examples	2m 17s
Lint	4m 1s
Build	2m 19s
Test (Go 1.27.2)	13m 0s
Go Tests	2s
	37m 10s