feat(websearch): enhance Gemini CLI integration, package manager detection, and WebSearch status

- Improve Gemini CLI integration in websearch hook: use gemini-2.5-flash & --yolo.
- Update `dev-install.sh` for better package manager (npm/bun) auto-detection.
- Introduce `displayWebSearchStatus` for improved user experience.
- Refactor `mcp-manager.ts` to track CCS-managed MCP servers.

lib/hooks/websearch-gemini-transformer.cjs

@@ -99,7 +99,9 @@ function processHook() {
     const geminiResult = tryGeminiSearch(query);
 
     if (geminiResult.success) {
-      // Success! Return results via deny with reason
+      // Success! Use deny with clear success messaging
+      // Note: "deny" prevents native WebSearch from running (which would fail anyway)
+      // The permissionDecisionReason contains the actual search results
       const output = {
         hookSpecificOutput: {
           hookEventName: 'PreToolUse',
@@ -143,12 +145,18 @@ function tryGeminiSearch(query) {
     const prompt = buildGeminiPrompt(query);
 
     if (process.env.CCS_DEBUG) {
-      console.error(`[CCS Hook] Executing: gemini -p "${prompt.substring(0, 100)}..."`);
+      console.error(`[CCS Hook] Executing: gemini --model gemini-2.5-flash --yolo -p "..."`);
     }
 
-    // Execute gemini CLI using spawnSync to avoid shell injection
-    // Note: gemini CLI uses OAuth auth, no API key needed
-    const spawnResult = spawnSync('gemini', ['-p', prompt], {
+    // Execute gemini CLI with required flags:
+    // --model gemini-2.5-flash: Use the flash model for fast responses
+    // --yolo: Skip confirmation prompts for tool use
+    // -p: Provide prompt
+    const spawnResult = spawnSync('gemini', [
+      '--model', 'gemini-2.5-flash',
+      '--yolo',
+      '-p', prompt
+    ], {
       encoding: 'utf8',
       timeout: timeoutMs,
       maxBuffer: 1024 * 1024 * 2, // 2MB buffer for large responses
@@ -209,7 +217,7 @@ function tryGeminiSearch(query) {
     if (err.code === 'ENOENT') {
       return {
         success: false,
-        error: 'Gemini CLI not found (not installed or not in PATH)',
+        error: 'Gemini CLI not installed. Install with: npm install -g @google/gemini-cli',
       };
     }
 
@@ -257,18 +265,15 @@ function buildGeminiPrompt(query) {
  */
 function formatGeminiResults(query, content) {
   return [
-    '[WebSearch Results via Gemini]',
+    '=== WEBSEARCH COMPLETED SUCCESSFULLY ===',
+    '(via Gemini CLI - this is NOT an error)',
     '',
     `Query: "${query}"`,
     '',
-    '---',
-    '',
     content,
     '',
-    '---',
-    '',
-    'Search completed successfully. You can use this information to answer the user\'s question.',
-    'If you need more specific information, you can search again with a refined query.',
+    '=========================================',
+    'Use this information to answer the user. Search again if needed.',
   ].join('\n');
 }
 
@@ -285,6 +290,10 @@ function getMcpFallbackMessage(query, error) {
     '',
     `Gemini CLI failed: ${error || 'Unknown error'}`,
     '',
+    'To enable Gemini CLI WebSearch:',
+    '  1. Install: npm install -g @google/gemini-cli',
+    '  2. Authenticate: gemini auth',
+    '',
     'The native WebSearch tool is not available with your current provider.',
     'Please use one of the following MCP tools instead:',
     '',