Add AI module with A2A wrapper and task agent

- Disable FuzzForge MCP connection (no Prefect backend)
- Add a2a_wrapper module for programmatic A2A agent tasks
- Add task_agent (LiteLLM A2A agent) on port 10900
- Create volumes/env/ for centralized Docker config
- Update docker-compose.yml with task-agent service
- Remove workflow_automation_skill from agent card

cli/src/fuzzforge_cli/config.py

@@ -403,12 +403,12 @@ class ProjectConfigManager:
         if max_tokens:
             os.environ["LLM_MAX_TOKENS"] = str(max_tokens)
 
-        # Provide a default MCP endpoint for local FuzzForge backend access when unset
-        if not os.getenv("FUZZFORGE_MCP_URL"):
-            os.environ["FUZZFORGE_MCP_URL"] = os.getenv(
-                "FUZZFORGE_DEFAULT_MCP_URL",
-                "http://localhost:8010/mcp",
-            )
+        # Disabled - FuzzForge MCP backend connection
+        # if not os.getenv("FUZZFORGE_MCP_URL"):
+        #     os.environ["FUZZFORGE_MCP_URL"] = os.getenv(
+        #         "FUZZFORGE_DEFAULT_MCP_URL",
+        #         "http://localhost:8010/mcp",
+        #     )
 
     def refresh(self) -> None:
         """Reload configuration from disk."""