feat(core): Support routing for subagents.

[joshualitt]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @joshualitt, 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 significant enhancement to how models are selected for subagents. By allowing subagents to specify "auto" for their model configuration, the system can now dynamically route requests through a ModelRouterService. This enables more intelligent and flexible model selection based on the current context, improving the adaptability and efficiency of agent interactions. The changes involve updates to the agent executor, model configuration service, and various routing strategies to support this new routing capability.

Highlights

• Subagent Model Routing: Subagents can now leverage model routing by setting their modelConfig.model to "auto", allowing dynamic model selection based on the current context.
• LocalAgentExecutor Integration: The LocalAgentExecutor has been updated to incorporate the ModelRouterService when an "auto" model is specified for an agent, enabling intelligent model selection.
• Runtime Model Overrides: The ModelConfigService now supports registering runtime model overrides, which are prioritized during model resolution, offering greater flexibility.
• RoutingContext Enhancement: The RoutingContext interface has been extended with a requestedModel property to provide more specific context to routing strategies.
• Routing Strategy Adaptations: All core routing strategies (ClassifierStrategy, FallbackStrategy, OverrideStrategy) have been updated to utilize the requestedModel from the RoutingContext for more precise routing decisions.

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[github-actions]

Size Change: +1.96 kB (+0.01%)

Total Size: 22.2 MB

Filename	Size	Change
./bundle/gemini.js	22.2 MB	+1.96 kB (+0.01%)

ℹ️ View Unchanged

Filename	Size
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB
./bundle/sandbox-macos-permissive-open.sb	890 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB

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[gemini-code-assist]

Code Review

This pull request adds support for model routing within subagents by allowing their model to be configured as "auto". When an agent with an "auto" model is executed, the ModelRouterService is invoked to select a concrete model at runtime. The implementation is solid, using runtime model overrides to correctly apply agent-specific generation parameters to the routed model. The LocalAgentExecutor and all routing strategies have been updated to handle this new logic, and the changes are backed by a comprehensive suite of unit tests. The overall design is robust and well-executed.