feat(core): add adk.agentSessionSubagentEnabled flag

[adamfweidman]

Summary

Adds the adk.agentSessionSubagentEnabled experimental flag to control the rollout of session-based subagent invocations.

Details

• Added agentSessionSubagentEnabled to ADKSettings interface in packages/core/src/config/config.ts.
• Added corresponding field and initialization in Config class.
• Added isAgentSessionEnabled() getter method.
• This branch is stacked on top of remote-invocation.

Related Issues

Relates to #22700

How to Validate

Verified that the codebase builds successfully with the new flag.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new experimental configuration flag, adk.agentSessionSubagentEnabled, to enable or disable session-based subagent invocations. This change provides granular control over a new feature rollout, allowing for a phased activation of subagent functionality within the system.

Highlights

• New Experimental Flag: Introduced the adk.agentSessionSubagentEnabled experimental flag to control the rollout of session-based subagent invocations.
• Configuration Update: Added the agentSessionSubagentEnabled property to the ADKSettings interface and integrated it into the Config class with proper initialization.
• Feature Access Method: Implemented a new getter method, isAgentSessionEnabled(), to provide access to the state of the agentSessionSubagentEnabled flag.

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[gemini-code-assist]

Code Review

This pull request introduces a new configuration setting, agentSessionSubagentEnabled, to the ADKSettings interface and the Config class. The changes include adding the property to the interface and class, initializing it within the constructor with a default value of false, and providing a public isAgentSessionEnabled method to access the setting. There were no review comments provided for this pull request, so I have no feedback to provide.