chore(release/v2-candidate): release 2.0.0-alpha.2

[Jacksunwei]

2.0.0-alpha.2 (2026-03-26)

Bug Fixes

• add agent name validation to prevent arbitrary module imports (be094f7)
• add protection for arbitrary module imports (0019801), closes #4947
• Default to ClusterIP so GKE deployment isn't publicly exposed by default (27aed23)
• enforce allowed file extensions for GET requests in the builder API (68ece4e)
• Exclude compromised LiteLLM versions from dependencies pin to 1.82.6 (79ed953)
• gate builder endpoints behind web flag (584283e)
• Update eval extras to Vertex SDK package version with constrained LiteLLM upperbound (a86d0aa)

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