fix: display proper persona names in custom agent manifests

## Problem
Custom agents showed generic names (like "Commit Poet") instead of their
actual persona names (like "Inkwell Von Comitizen") in the agent manifest.

## Root Cause
The extractManifestData function was using metadata.name/title instead of
extracting the persona name from the compiled agent XML.

## Solution
1. Added extractAgentAttribute function to pull attributes from <agent> tag
2. Prioritize XML extraction over metadata for persona info:
   - displayName: uses agent title attribute from XML
   - title: uses agent title attribute from XML
   - icon: uses agent icon attribute from XML
   - Falls back to metadata if XML extraction fails

## Result
Custom agents now display their actual persona names in manifests:
- Before: "Commit Poet"
- After: "Inkwell Von Comitizen"

This provides better user experience with proper agent identification
in IDE integrations and manifests.

tools/cli/installers/lib/core/installer.js

@@ -2371,7 +2371,6 @@ class Installer {
           if (await fs.pathExists(manifestFile)) {
             const manifestData = extractManifestData(xml, { ...metadata, name: finalAgentName }, relativePath, 'custom');
             manifestData.name = finalAgentName;
-            manifestData.displayName = metadata.name || finalAgentName;
             manifestData.path = relativePath;
             addToManifest(manifestFile, manifestData);
           }

tools/cli/lib/agent/installer.js

@@ -677,6 +677,12 @@ function extractManifestData(xmlContent, metadata, agentPath, moduleName = 'cust
     return match[1].trim().replaceAll(/\n+/g, ' ').replaceAll(/\s+/g, ' ').trim();
   };
 
+  // Extract attributes from agent tag
+  const extractAgentAttribute = (attr) => {
+    const match = xmlContent.match(new RegExp(`<agent[^>]*\\s${attr}=["']([^"']+)["']`));
+    return match ? match[1] : '';
+  };
+
   const extractPrinciples = () => {
     const match = xmlContent.match(/<principles>([\s\S]*?)<\/principles>/);
     if (!match) return '';
@@ -689,11 +695,15 @@ function extractManifestData(xmlContent, metadata, agentPath, moduleName = 'cust
     return principles;
   };
 
+  // Prioritize XML extraction over metadata for agent persona info
+  const xmlTitle = extractAgentAttribute('title') || extractTag('name');
+  const xmlIcon = extractAgentAttribute('icon');
+
   return {
     name: metadata.id ? path.basename(metadata.id, '.md') : metadata.name.toLowerCase().replaceAll(/\s+/g, '-'),
-    displayName: metadata.name || '',
+    displayName: xmlTitle || metadata.name || '',
-    title: metadata.title || '',
+    title: xmlTitle || metadata.title || '',
-    icon: metadata.icon || '',
+    icon: xmlIcon || metadata.icon || '',
     role: extractTag('role'),
     identity: extractTag('identity'),
     communicationStyle: extractTag('communication_style'),