Client-layer facade for Spring AI Agents - AgentClient, Goal, GoalTemplate following ChatClient patterns

Spring Boot auto-configuration for AgentClient — provides AgentClient.Builder bean

Full CLI entry point (BenchApp) and LLM judge (TestQualityJudge) for Agent Bench

AgentClient CLI-agent integration for Agent Judge - bridge from CLI-delegated agent execution to JudgmentContext

Workflow-backed AgentInvoker base classes: WorkflowInvoker and WorkflowAgentInvoker