chore(release/candidate): release 1.30.0

[Jacksunwei]

🤖 I have created a release beep boop

1.30.0 (2026-04-13)

Features

• Add Auth Provider support to agent registry (f2c68eb)
• Add Parameter Manager integration to ADK (b0715d7)
• Add support for Gemma 4 models in ADK (9d4ecbe), closes #5156
• allow users to include artifacts from artifact_service in A2A events using provided interceptor (e63d991)
• emit a TaskStatusUpdateEvent for ADK events with no output parts but with event.actions (dcc485b)
• Live avatar support in ADK (a64a8e4)
• live: expose live_session_resumption_update as Event in BaseLlmFlow (2626ad7), closes #4357
• Promote BigQuery tools to Stable (abcf14c)
• samples: add sample for skill activation via environment tools (2cbb523)

Bug Fixes

• Add "gcloud config unset project" command to express mode flow (e7d8160)
• avoid load all agents in adk web server (cb4dd42)
• Change express mode user flow so it's more clear that an express mode project is being created (0fedb3b)
• Custom pickling in McpToolset to exclude unpicklable objects like errlog (d62558c)
• Fix credential leakage vulnerability in Agent Registry (e3567a6)
• Include a link to the deployed agent (547766a)
• preserve interaction ids for interactions SSE tool calls (9a19304), closes #5169
• validate user_id and session_id against path traversal (cbcb5e6), closes #5110

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