fix(plugins): enable bundled Brave web search plugin by default (#52072)

Brave is a bundled web search plugin but was missing from
BUNDLED_ENABLED_BY_DEFAULT, causing it to be filtered out during
provider resolution. This made web_search unavailable even when
plugins.entries.brave.enabled was configured.

Fixes #51937

Co-authored-by: Ubuntu <ubuntu@ip-172-26-10-234.us-west-2.compute.internal>
Co-authored-by: Vincent Koc <vincentkoc@ieee.org>

src/plugins/config-state.test.ts

@@ -271,6 +271,11 @@ describe("resolveEnableState", () => {
     expect(state).toEqual({ enabled: true });
   });
 
+  it("enables bundled web search providers like brave by default", () => {
+    const state = resolveEnableState("brave", "bundled", normalizePluginsConfig({}));
+    expect(state).toEqual({ enabled: true });
+  });
+
   it("allows bundled plugins to opt into default enablement from manifest metadata", () => {
     const state = resolveEnableState("profile-aware", "bundled", normalizePluginsConfig({}), true);
     expect(state).toEqual({ enabled: true });

src/plugins/config-state.ts

@@ -31,6 +31,7 @@ export type NormalizedPluginsConfig = {
 export const BUNDLED_ENABLED_BY_DEFAULT = new Set<string>([
   "amazon-bedrock",
   "anthropic",
+  "brave",
   "byteplus",
   "cloudflare-ai-gateway",
   "deepseek",