fix(runtime,kernel): HandTool 空壳修复 — 桥接到 HandRegistry 真实执行

B-HAND-1 修复: LLM 调用 hand_quiz/hand_researcher 等 Hand 工具后,
HandTool::execute() 原来返回假成功 JSON, 实际 Hand 并不执行.

修复方案 (沿用 SkillExecutor 模式):
- tool.rs: 新增 HandExecutor trait + ToolContext.hand_executor 字段
- hand_tool.rs: execute() 通过 context.hand_executor 分发到真实执行
- loop_runner.rs: AgentLoop 新增 hand_executor 字段 + builder + 3处 ToolContext 传递
- adapters.rs: 新增 KernelHandExecutor 桥接 HandRegistry.execute()
- kernel/mod.rs: 初始化 KernelHandExecutor + 注册到 AgentLoop
- messaging.rs: 两处 AgentLoop 构建添加 .with_hand_executor()

数据流: LLM tool call → HandTool::execute() → ToolContext.hand_executor
         → KernelHandExecutor → HandRegistry.execute() → Hand trait impl

809 tests passed, 0 failed.

crates/zclaw-runtime/src/loop_runner.rs

@@ -7,7 +7,7 @@ use zclaw_types::{AgentId, SessionId, Message, Result};
 
 use crate::driver::{LlmDriver, CompletionRequest, ContentBlock};
 use crate::stream::StreamChunk;
-use crate::tool::{ToolRegistry, ToolContext, SkillExecutor};
+use crate::tool::{ToolRegistry, ToolContext, SkillExecutor, HandExecutor};
 use crate::tool::builtin::PathValidator;
 use crate::growth::GrowthIntegration;
 use crate::compaction::{self, CompactionConfig};
@@ -28,6 +28,7 @@ pub struct AgentLoop {
     max_tokens: u32,
     temperature: f32,
     skill_executor: Option<Arc<dyn SkillExecutor>>,
+    hand_executor: Option<Arc<dyn HandExecutor>>,
     path_validator: Option<PathValidator>,
     /// Growth system integration (optional)
     growth: Option<GrowthIntegration>,
@@ -64,6 +65,7 @@ impl AgentLoop {
             max_tokens: 16384,
             temperature: 0.7,
             skill_executor: None,
+            hand_executor: None,
             path_validator: None,
             growth: None,
             compaction_threshold: 0,
@@ -81,6 +83,12 @@ impl AgentLoop {
         self
     }
 
+    /// Set the hand executor for dispatching Hand tool calls to HandRegistry
+    pub fn with_hand_executor(mut self, executor: Arc<dyn HandExecutor>) -> Self {
+        self.hand_executor = Some(executor);
+        self
+    }
+
     /// Set the path validator for file system operations
     pub fn with_path_validator(mut self, validator: PathValidator) -> Self {
         self.path_validator = Some(validator);
@@ -199,6 +207,7 @@ impl AgentLoop {
             working_directory: working_dir,
             session_id: Some(session_id.to_string()),
             skill_executor: self.skill_executor.clone(),
+            hand_executor: self.hand_executor.clone(),
             path_validator: Some(path_validator),
             event_sender: None,
         }
@@ -567,6 +576,7 @@ impl AgentLoop {
         let tools = self.tools.clone();
         let middleware_chain = self.middleware_chain.clone();
         let skill_executor = self.skill_executor.clone();
+        let hand_executor = self.hand_executor.clone();
         let path_validator = self.path_validator.clone();
         let agent_id = self.agent_id.clone();
         let model = self.model.clone();
@@ -849,6 +859,7 @@ impl AgentLoop {
                                     working_directory: working_dir,
                                     session_id: Some(session_id_clone.to_string()),
                                     skill_executor: skill_executor.clone(),
+                                    hand_executor: hand_executor.clone(),
                                     path_validator: Some(pv),
                                     event_sender: Some(tx.clone()),
                                 };
@@ -903,6 +914,7 @@ impl AgentLoop {
                         working_directory: working_dir,
                         session_id: Some(session_id_clone.to_string()),
                         skill_executor: skill_executor.clone(),
+                        hand_executor: hand_executor.clone(),
                         path_validator: Some(pv),
                         event_sender: Some(tx.clone()),
                     };