feat: 新增技能编排引擎和工作流构建器组件

refactor: 统一Hands系统常量到单个源文件
refactor: 更新Hands中文名称和描述

fix: 修复技能市场在连接状态变化时重新加载
fix: 修复身份变更提案的错误处理逻辑

docs: 更新多个功能文档的验证状态和实现位置
docs: 更新Hands系统文档

test: 添加测试文件验证工作区路径

crates/zclaw-kernel/src/export/html.rs

@@ -10,7 +10,6 @@
 use crate::generation::{Classroom, GeneratedScene, SceneContent, SceneType, SceneAction};
 use super::{ExportOptions, ExportResult, Exporter, sanitize_filename};
 use zclaw_types::Result;
-use zclaw_types::ZclawError;
 
 /// HTML exporter
 pub struct HtmlExporter {

crates/zclaw-kernel/src/export/pptx.rs

@@ -10,7 +10,7 @@
 //! without external dependencies. For more advanced features, consider using
 //! a dedicated library like `pptx-rs` or `office` crate.
 
-use crate::generation::{Classroom, GeneratedScene, SceneContent, SceneType, SceneAction};
+use crate::generation::{Classroom, GeneratedScene, SceneContent, SceneAction};
 use super::{ExportOptions, ExportResult, Exporter, sanitize_filename};
 use zclaw_types::{Result, ZclawError};
 use std::collections::HashMap;
@@ -211,7 +211,7 @@ impl PptxExporter {
 
     /// Generate title slide XML
     fn generate_title_slide(&self, classroom: &Classroom) -> String {
-        let objectives = classroom.objectives.iter()
+        let _objectives = classroom.objectives.iter()
             .map(|o| format!("- {}", o))
             .collect::<Vec<_>>()
             .join("\n");