feat(FN-3901): add builtin research web-search provider as default

The merge adds a builtin web-search research provider as the default, replacing the need for external research provider configuration and removing the setup gate for builtin defaults. Dashboard settings UX for research defaults was aligned (ResearchView, SettingsModal), CLI research commands were up

Fusion-Task-Id: FN-3901

packages/core/src/__tests__/research-settings.test.ts

@@ -95,6 +95,14 @@ describe("resolveResearchSettings", () => {
     expect(resolved.searchProvider).toBe("brave");
   });
 
+  it("honors explicit legacy global search provider opt-out", () => {
+    const resolved = resolveResearchSettings({
+      researchGlobalWebSearchProvider: "none",
+    });
+
+    expect(resolved.searchProvider).toBe("none");
+  });
+
   it("supports null-as-delete semantics for researchSettings object", () => {
     const resolved = resolveResearchSettings({
       researchGlobalDefaults: {
@@ -123,6 +131,7 @@ describe("resolveResearchSettings", () => {
     expect(fromLegacyGlobalTimeout.limits.maxConcurrentRuns).toBe(9);
 
     const hardcodedFallback = resolveResearchSettings({});
+    expect(hardcodedFallback.searchProvider).toBe("builtin");
     expect(hardcodedFallback.limits.maxDurationMs).toBe(300000);
     expect(hardcodedFallback.limits.requestTimeoutMs).toBe(30000);
     expect(hardcodedFallback.defaultExportFormat).toBe("markdown");

packages/core/src/research-settings.ts

@@ -20,6 +20,8 @@ export interface ResolvedResearchSettings {
   defaultExportFormat: "markdown" | "json";
 }
 
+const DEFAULT_SEARCH_PROVIDER = "builtin";
+
 const FALLBACK_SOURCES: ResearchEnabledSources = {
   webSearch: true,
   pageFetch: true,
@@ -34,7 +36,11 @@ export function resolveResearchSettings(settings: Partial<Settings> | undefined)
 
   return {
     enabled: projectSettings?.enabled ?? settings?.researchEnabled ?? settings?.researchGlobalEnabled ?? true,
-    searchProvider: projectSettings?.searchProvider ?? globalDefaults?.searchProvider,
+    searchProvider:
+      projectSettings?.searchProvider ??
+      globalDefaults?.searchProvider ??
+      settings?.researchGlobalWebSearchProvider ??
+      DEFAULT_SEARCH_PROVIDER,
     synthesisProvider: projectSettings?.synthesisProvider ?? globalDefaults?.synthesisProvider,
     synthesisModelId: projectSettings?.synthesisModelId ?? globalDefaults?.synthesisModelId,
     enabledSources: {

packages/core/src/settings-schema.ts

@@ -104,7 +104,7 @@ export const DEFAULT_GLOBAL_SETTINGS = {
   researchGlobalDefaultTimeout: 300000,
   researchGlobalMaxSourcesPerRun: 20,
   researchGlobalMaxSynthesisRounds: 2,
-  researchGlobalWebSearchProvider: "none",
+  researchGlobalWebSearchProvider: "builtin",
   researchGlobalSearxngUrl: undefined,
   researchGlobalBraveApiKey: undefined,
   researchGlobalGoogleSearchApiKey: undefined,

packages/core/src/types.ts

@@ -1449,7 +1449,7 @@ export interface DaemonTokenSettings {
  * The dashboard UI shows these under a "Global" section.
  */
 /** Web search backend for auto-research provider. */
-export type WebSearchBackend = "searxng" | "brave" | "google" | "tavily" | "none";
+export type WebSearchBackend = "builtin" | "searxng" | "brave" | "google" | "tavily" | "none";
 
 export interface ResearchEnabledSources {
   webSearch: boolean;
@@ -1767,7 +1767,7 @@ export interface GlobalSettings {
   /** Default maximum number of synthesis rounds per run.
    *  Default: 2. */
   researchGlobalMaxSynthesisRounds?: number;
-  /** Web search backend for auto-research. Default: "none" (disabled). */
+  /** Web search backend for auto-research. Default: "builtin". */
   researchGlobalWebSearchProvider?: WebSearchBackend;
   /** SearXNG instance URL (required when researchGlobalWebSearchProvider is "searxng"). */
   researchGlobalSearxngUrl?: string;