Fix a2a_wrapper imports and add clean usage example

- Remove top-level imports from fuzzforge_ai/__init__.py to avoid dependency issues
- Fix config_bridge.py exception handling (remove undefined exc variable)
- Add examples/test_a2a_simple.py demonstrating clean a2a_wrapper usage
- Update package to use explicit imports: from fuzzforge_ai.a2a_wrapper import send_agent_task

All functionality preserved, imports are now explicit and modular.

ai/src/fuzzforge_ai/__init__.py

@@ -3,6 +3,11 @@ FuzzForge AI Module - Agent-to-Agent orchestration system
 
 This module integrates the fuzzforge_ai components into FuzzForge,
 providing intelligent AI agent capabilities for security analysis.
+
+Usage:
+    from fuzzforge_ai.a2a_wrapper import send_agent_task
+    from fuzzforge_ai.agent import FuzzForgeAgent
+    from fuzzforge_ai.config_manager import ConfigManager
 """
 # Copyright (c) 2025 FuzzingLabs
 #
@@ -16,9 +21,4 @@ providing intelligent AI agent capabilities for security analysis.
 # Additional attribution and requirements are provided in the NOTICE file.
 
 
-__version__ = "0.6.0"
-
-from .agent import FuzzForgeAgent
-from .config_manager import ConfigManager
-
-__all__ = ['FuzzForgeAgent', 'ConfigManager']
+__version__ = "0.6.0"

ai/src/fuzzforge_ai/config_bridge.py

@@ -21,10 +21,10 @@ except ImportError:  # pragma: no cover - used when CLI not available
             raise ImportError(
                 "ProjectConfigManager is unavailable. Install the FuzzForge CLI "
                 "package or supply a compatible configuration object."
-            ) from exc
+            )
 
     def __getattr__(name):  # pragma: no cover - defensive
-        raise ImportError("ProjectConfigManager unavailable") from exc
+        raise ImportError("ProjectConfigManager unavailable")
 
 ProjectConfigManager = _ProjectConfigManager