v0.59.0 (from v0.58.4)

What changed

minor release — Adds backward-compatible Vertex Passthrough authentication support, including catalog advertisement, persistence, and Authorization forwarding.

Commits

• 6b462e1 Merge pull request #801 from NeuralTrust/cursor/hotfix-vertex-passthrough-a778
• a78515c feat: advertise Vertex Passthrough in frontend auth catalog
• 58bb1e0 test: cover Vertex passthrough auth
• 1c72f65 feat: forward incoming Authorization for Vertex passthrough
• ed77de7 feat: accept Vertex passthrough auth type on TargetAuth
• a15a0e4 feat: accept Vertex passthrough auth with no stored credentials
• 4e99c3b feat: advertise Vertex Passthrough in catalog and persist empty auth
• 6166521 feat: persist Vertex passthrough and forward Authorization (hotfix)
• 597a783 rebuild agentgateway v0.58.4 in k8s/overlays/prod,k8s/overlays/prod-us