[Gemma x Gemini CLI] Add an Experimental Gemma Router that uses a LiteRT-LM shim into the Composite Model Classifier Strategy (#17231)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Allen Hutchison <adh@google.com>

packages/core/src/routing/routingStrategy.ts

@@ -7,6 +7,7 @@
 import type { Content, PartListUnion } from '@google/genai';
 import type { BaseLlmClient } from '../core/baseLlmClient.js';
 import type { Config } from '../config/config.js';
+import type { LocalLiteRtLmClient } from '../core/localLiteRtLmClient.js';
 
 /**
  * The output of a routing decision. It specifies which model to use and why.
@@ -58,6 +59,7 @@ export interface RoutingStrategy {
     context: RoutingContext,
     config: Config,
     baseLlmClient: BaseLlmClient,
+    localLiteRtLmClient: LocalLiteRtLmClient,
   ): Promise<RoutingDecision | null>;
 }
 
@@ -74,5 +76,6 @@ export interface TerminalStrategy extends RoutingStrategy {
     context: RoutingContext,
     config: Config,
     baseLlmClient: BaseLlmClient,
+    localLiteRtLmClient: LocalLiteRtLmClient,
   ): Promise<RoutingDecision>;
 }