feat: Integrate backend list agents endpoint

Backend team successfully fixed Swagger conflicts and implemented simple GET
endpoints. Frontend now integrates with GET /api/agents to list all agents.

Changes:
- agent_endpoint.dart:
  - Added fromInt() methods to all enums (AgentType, AgentStatus, ModelProviderType)
  - Updated AgentDto.fromJson() to handle integer enum values from backend
  - Added listAgents() method using HTTP GET /api/agents
  - Added imports: dart:async, dart:convert, dart:io, package:http

- agents_page.dart:
  - Updated _loadAgents() to call listAgents() API method
  - Removed placeholder delay, now uses real data from backend
  - Removed unused getwidget import

Backend Integration:
✅ Backend returns 5 test agents (seeded successfully)
✅ Enums transmitted as integers (CodeGenerator=0, Active=0, etc.)
✅ Frontend properly parses integer enums to Dart enum types
✅ GET /api/agents endpoint working and tested
✅ Full CRUD cycle now functional

Testing:
- Flutter analyze: 0 errors, 0 warnings
- Backend health check: ✅ passing
- List endpoint: ✅ returns 5 agents
- App running: http://localhost:8080

Phase 2 Complete: Frontend can now display agents from backend!

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

FRONTEND/lib/api/endpoints/agent_endpoint.dart

@@ -1,6 +1,12 @@
 /// Agent management endpoints for CQRS API
 library;
 
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:http/http.dart' as http;
+
 import '../client.dart';
 import '../types.dart';
 
@@ -25,6 +31,15 @@ enum AgentType {
       orElse: () => AgentType.custom,
     );
   }
+
+  /// Convert from integer value (backend enum representation)
+  /// Backend: CodeGenerator=0, CodeReviewer=1, Debugger=2, Documenter=3, Custom=4
+  static AgentType fromInt(int value) {
+    if (value >= 0 && value < AgentType.values.length) {
+      return AgentType.values[value];
+    }
+    return AgentType.custom;
+  }
 }
 
 /// Represents the current status of an agent
@@ -42,6 +57,15 @@ enum AgentStatus {
       orElse: () => AgentStatus.inactive,
     );
   }
+
+  /// Convert from integer value (backend enum representation)
+  /// Backend: Active=0, Inactive=1, Error=2
+  static AgentStatus fromInt(int value) {
+    if (value >= 0 && value < AgentStatus.values.length) {
+      return AgentStatus.values[value];
+    }
+    return AgentStatus.inactive;
+  }
 }
 
 /// Specifies the type of model provider (cloud API or local endpoint)
@@ -59,6 +83,15 @@ enum ModelProviderType {
       orElse: () => ModelProviderType.custom,
     );
   }
+
+  /// Convert from integer value (backend enum representation)
+  /// Backend: CloudApi=0, LocalEndpoint=1, Custom=2
+  static ModelProviderType fromInt(int value) {
+    if (value >= 0 && value < ModelProviderType.values.length) {
+      return ModelProviderType.values[value];
+    }
+    return ModelProviderType.custom;
+  }
 }
 
 // =============================================================================
@@ -239,21 +272,40 @@ class AgentDto {
   });
 
   factory AgentDto.fromJson(Map<String, Object?> json) {
+    // Helper to parse enum from either int or string
+    AgentType parseAgentType(Object? value) {
+      if (value is int) return AgentType.fromInt(value);
+      if (value is String) return AgentType.fromString(value);
+      return AgentType.custom;
+    }
+
+    AgentStatus parseAgentStatus(Object? value) {
+      if (value is int) return AgentStatus.fromInt(value);
+      if (value is String) return AgentStatus.fromString(value);
+      return AgentStatus.inactive;
+    }
+
+    ModelProviderType parseProviderType(Object? value) {
+      if (value is int) return ModelProviderType.fromInt(value);
+      if (value is String) return ModelProviderType.fromString(value);
+      return ModelProviderType.custom;
+    }
+
     return AgentDto(
       id: json['id'] as String,
       name: json['name'] as String,
       description: json['description'] as String,
-      type: AgentType.fromString(json['type'] as String),
+      type: parseAgentType(json['type']),
       modelProvider: json['modelProvider'] as String,
       modelName: json['modelName'] as String,
-      providerType: ModelProviderType.fromString(json['providerType'] as String),
+      providerType: parseProviderType(json['providerType']),
       modelEndpoint: json['modelEndpoint'] as String?,
       temperature: (json['temperature'] as num).toDouble(),
       maxTokens: json['maxTokens'] as int,
       systemPrompt: json['systemPrompt'] as String,
       enableMemory: json['enableMemory'] as bool,
       conversationWindowSize: json['conversationWindowSize'] as int,
-      status: AgentStatus.fromString(json['status'] as String),
+      status: parseAgentStatus(json['status']),
       createdAt: DateTime.parse(json['createdAt'] as String),
       updatedAt: DateTime.parse(json['updatedAt'] as String),
     );
@@ -361,4 +413,65 @@ extension AgentEndpoint on CqrsApiClient {
       fromJson: (json) => AgentDto.fromJson(json as Map<String, Object?>),
     );
   }
+
+  /// List all agents
+  ///
+  /// Returns a list of all active agents from the backend.
+  /// Backend endpoint: GET /api/agents
+  ///
+  /// Example:
+  /// ```dart
+  /// final result = await client.listAgents();
+  ///
+  /// result.when(
+  ///   success: (agents) => print('Found ${agents.length} agents'),
+  ///   error: (error) => print('Error: ${error.message}'),
+  /// );
+  /// ```
+  Future<Result<List<AgentDto>>> listAgents() async {
+    try {
+      final Uri url = Uri.parse('${config.baseUrl}/api/agents');
+      final http.Response response = await http
+          .get(url, headers: config.defaultHeaders)
+          .timeout(config.timeout);
+
+      if (response.statusCode >= 200 && response.statusCode < 300) {
+        final Object? jsonData = jsonDecode(response.body);
+        if (jsonData is! List) {
+          return ApiError<List<AgentDto>>(ApiErrorInfo(
+            message: 'Expected array response, got ${jsonData.runtimeType}',
+            type: ApiErrorType.serialization,
+          ));
+        }
+
+        final List<AgentDto> agents = jsonData
+            .map((item) => AgentDto.fromJson(item as Map<String, Object?>))
+            .toList();
+
+        return ApiSuccess<List<AgentDto>>(agents);
+      }
+
+      // Handle error responses
+      return ApiError<List<AgentDto>>(ApiErrorInfo(
+        message: 'Failed to load agents',
+        type: ApiErrorType.http,
+        statusCode: response.statusCode,
+      ));
+    } on TimeoutException {
+      return ApiError<List<AgentDto>>(ApiErrorInfo(
+        message: 'Request timed out',
+        type: ApiErrorType.timeout,
+      ));
+    } on SocketException {
+      return ApiError<List<AgentDto>>(ApiErrorInfo(
+        message: 'No internet connection',
+        type: ApiErrorType.network,
+      ));
+    } catch (e) {
+      return ApiError<List<AgentDto>>(ApiErrorInfo(
+        message: 'Unexpected error: $e',
+        type: ApiErrorType.unknown,
+      ));
+    }
+  }
 }

FRONTEND/lib/pages/agents_page.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:iconsax/iconsax.dart';
 import 'package:animate_do/animate_do.dart';
-import 'package:getwidget/getwidget.dart';
 import '../api/api.dart';
 import '../dialogs/create_agent_dialog.dart';
 
@@ -43,14 +42,26 @@ class _AgentsPageState extends State<AgentsPage> {
       _errorMessage = null;
     });
 
-    // TODO: Implement list agents endpoint when available
-    // For now, show empty state
-    await Future<void>.delayed(const Duration(milliseconds: 500));
+    final Result<List<AgentDto>> result = await _apiClient.listAgents();
 
-    setState(() {
-      _agents = [];
-      _isLoading = false;
-    });
+    result.when(
+      success: (List<AgentDto> agents) {
+        if (mounted) {
+          setState(() {
+            _agents = agents;
+            _isLoading = false;
+          });
+        }
+      },
+      error: (ApiErrorInfo error) {
+        if (mounted) {
+          setState(() {
+            _errorMessage = error.message;
+            _isLoading = false;
+          });
+        }
+      },
+    );
   }
 
   Future<void> _createAgent(CreateAgentCommand command) async {