fix(plugins): forward plugin subagent overrides (#48277)

Merged via squash.

Prepared head SHA: ffa45893e0
Co-authored-by: jalehman <550978+jalehman@users.noreply.github.com>
Co-authored-by: jalehman <550978+jalehman@users.noreply.github.com>
Reviewed-by: @jalehman

src/plugins/runtime/gateway-request-scope.test.ts

@@ -20,4 +20,17 @@ describe("gateway request scope", () => {
       expect(second.getPluginRuntimeGatewayRequestScope()).toEqual(TEST_SCOPE);
     });
   });
+
+  it("attaches plugin id to the active scope", async () => {
+    const runtimeScope = await import("./gateway-request-scope.js");
+
+    await runtimeScope.withPluginRuntimeGatewayRequestScope(TEST_SCOPE, async () => {
+      await runtimeScope.withPluginRuntimePluginIdScope("voice-call", async () => {
+        expect(runtimeScope.getPluginRuntimeGatewayRequestScope()).toEqual({
+          ...TEST_SCOPE,
+          pluginId: "voice-call",
+        });
+      });
+    });
+  });
 });

src/plugins/runtime/gateway-request-scope.ts

@@ -8,6 +8,7 @@ export type PluginRuntimeGatewayRequestScope = {
   context?: GatewayRequestContext;
   client?: GatewayRequestOptions["client"];
   isWebchatConnect: GatewayRequestOptions["isWebchatConnect"];
+  pluginId?: string;
 };
 
 const PLUGIN_RUNTIME_GATEWAY_REQUEST_SCOPE_KEY: unique symbol = Symbol.for(
@@ -37,6 +38,20 @@ export function withPluginRuntimeGatewayRequestScope<T>(
   return pluginRuntimeGatewayRequestScope.run(scope, run);
 }
 
+/**
+ * Runs work under the current gateway request scope while attaching plugin identity.
+ */
+export function withPluginRuntimePluginIdScope<T>(pluginId: string, run: () => T): T {
+  const current = pluginRuntimeGatewayRequestScope.getStore();
+  const scoped: PluginRuntimeGatewayRequestScope = current
+    ? { ...current, pluginId }
+    : {
+        pluginId,
+        isWebchatConnect: () => false,
+      };
+  return pluginRuntimeGatewayRequestScope.run(scoped, run);
+}
+
 /**
  * Returns the current plugin gateway request scope when called from a plugin request handler.
  */

src/plugins/runtime/types.ts

@@ -8,6 +8,8 @@ export type { RuntimeLogger };
 export type SubagentRunParams = {
   sessionKey: string;
   message: string;
+  provider?: string;
+  model?: string;
   extraSystemPrompt?: string;
   lane?: string;
   deliver?: boolean;