refactor(extensions): merge google-search into search-the-web

Google Search was a standalone extension providing a single tool
(google_search) that used Gemini's Google Search grounding feature.
It had fallback logic to search-the-web providers (Tavily, Brave) when
Google OAuth was unavailable.

Merging it into search-the-web consolidates all web search capabilities
into one extension and eliminates the tight coupling between the two.

Changes:
- Copied google-search tool logic into search-the-web/tool-google-search.js
- Added registerGoogleSearchTool / resetGoogleSearchCache exports
- Integrated into search-the-web/index.js deferred loading
- Added google_search to search-the-web extension-manifest.json tools
- Deleted google-search/ extension directory

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/resources/extensions/google-search/extension-manifest.json

@@ -1,12 +0,0 @@
-{
-	"id": "google-search",
-	"name": "Google Search",
-	"version": "1.0.0",
-	"description": "Web search via Google with AI-synthesized answers and source citations",
-	"tier": "bundled",
-	"requires": { "platform": ">=2.29.0" },
-	"provides": {
-		"tools": ["google_search"],
-		"hooks": ["session_start", "session_shutdown"]
-	}
-}

src/resources/extensions/google-search/package.json

@@ -1,14 +0,0 @@
-{
-	"name": "pi-extension-google-search",
-	"private": true,
-	"version": "1.0.0",
-	"type": "module",
-	"engines": {
-		"node": ">=26.1.0"
-	},
-	"pi": {
-		"extensions": [
-			"./index.js"
-		]
-	}
-}

src/resources/extensions/search-the-web/extension-manifest.json

@@ -2,11 +2,11 @@
 	"id": "search-the-web",
 	"name": "Web Search",
 	"version": "1.0.0",
-	"description": "Web search via Tavily, MiniMax, Serper, Exa, Ollama, or Brave plus page extraction",
+	"description": "Web search via Tavily, MiniMax, Serper, Exa, Ollama, Brave, or Google plus page extraction",
 	"tier": "bundled",
 	"requires": { "platform": ">=2.29.0" },
 	"provides": {
-		"tools": ["search-the-web", "fetch_page", "search_and_read", "web_search"],
+		"tools": ["search-the-web", "fetch_page", "search_and_read", "web_search", "google_search"],
 		"commands": ["search-provider"],
 		"hooks": ["session_start", "model_select", "before_provider_request"]
 	}

src/resources/extensions/search-the-web/index.js

@@ -10,6 +10,7 @@ import { registerNativeSearchHooks } from "./native-search.js";
 
 let toolsPromise = null;
 let resetSearchLoopGuardStateRef = null;
+let resetGoogleSearchCacheRef = null;
 async function registerSearchTools(pi) {
 	if (!toolsPromise) {
 		toolsPromise = (async () => {
@@ -17,15 +18,19 @@ async function registerSearchTools(pi) {
 				{ registerSearchTool, resetSearchLoopGuardState },
 				{ registerFetchPageTool },
 				{ registerLLMContextTool },
+				{ registerGoogleSearchTool, resetGoogleSearchCache },
 			] = await Promise.all([
 				importExtensionModule(import.meta.url, "./tool-search.js"),
 				importExtensionModule(import.meta.url, "./tool-fetch-page.js"),
 				importExtensionModule(import.meta.url, "./tool-llm-context.js"),
+				importExtensionModule(import.meta.url, "./tool-google-search.js"),
 			]);
 			resetSearchLoopGuardStateRef = resetSearchLoopGuardState;
+			resetGoogleSearchCacheRef = resetGoogleSearchCache;
 			registerSearchTool(pi);
 			registerFetchPageTool(pi);
 			registerLLMContextTool(pi);
+			registerGoogleSearchTool(pi);
 		})().catch((error) => {
 			toolsPromise = null;
 			throw error;
@@ -42,9 +47,11 @@ export default function (pi) {
 		};
 		if (ctx.hasUI) {
 			resetLoopGuardState();
+			resetGoogleSearchCacheRef?.();
 			void registerSearchTools(pi)
 				.then(() => {
 					resetLoopGuardState();
+					resetGoogleSearchCacheRef?.();
 				})
 				.catch((error) => {
 					ctx.ui.notify(
@@ -56,5 +63,6 @@ export default function (pi) {
 		}
 		await registerSearchTools(pi);
 		resetLoopGuardState();
+		resetGoogleSearchCacheRef?.();
 	});
 }

src/resources/extensions/search-the-web/tool-google-search.js

@@ -20,7 +20,7 @@ import {
 	getBraveApiKey,
 	getTavilyApiKey,
 	resolveSearchProvider,
-} from "../search-the-web/provider.js";
+} from "./provider.js";
 
 /**
  * Build a Code Assist server through @google/gemini-cli-core.
@@ -183,13 +183,11 @@ async function executeFallbackSearch(query, signal) {
 	throw new Error("No fallback search provider available");
 }
 
-// ── In-session cache ─────────────────────────────────────────────────────────
-const resultCache = new Map();
 function cacheKey(query) {
 	return query.toLowerCase().trim();
 }
-// ── Extension ────────────────────────────────────────────────────────────────
-export default function (pi) {
+// ── Tool registration ────────────────────────────────────────────────────────
+export function registerGoogleSearchTool(pi) {
 	pi.registerTool({
 		name: "google_search",
 		label: "Google Search",
@@ -411,6 +409,11 @@ export default function (pi) {
 		}
 	});
 }
+let resultCache = new Map();
+/** Reset the google_search result cache (called by search-the-web extension on session_start). */
+export function resetGoogleSearchCache() {
+	resultCache.clear();
+}
 // ── Output formatting ────────────────────────────────────────────────────────
 function formatOutput(result, maxSources) {
 	const lines = [];