refactor: replace Task tool with Agent tool and fix schema compliance

## Task -> Agent Replacement
- Replace all Task({}) calls with Agent({}) across .claude/ directory
- Update allowed-tools declarations from Task to Agent
- Update documentation references from "Task tool" to "Agent tool"

## Schema Compliance Fixes

### Agent Schema
- Add missing required `description` parameter in 6 files
- Add missing `run_in_background: false` for subagent calls
- Add missing `subagent_type` parameter

### AskUserQuestion Schema
- Fix issue-manage/SKILL.md: reduce options from 5 to 4 (max allowed)

### SendMessage Schema
- Fix team-worker.md: use correct params (type, content, summary)
- Remove invalid `team_name` parameter

### TaskCreate/TaskUpdate Schema
- Remove invalid `blockedBy`, `owner`, `status` from TaskCreate calls
- Use separate TaskUpdate calls for dependencies and ownership
- Fix TaskUpdate syntax to use object parameter

### TeamDelete Schema
- Remove parameters from TeamDelete() calls (should be no params)

### TaskOutput Schema
- Fix Python-style syntax to JavaScript object syntax

## Files Changed
- 146 files updated across commands/, skills/, skills_lib/, agents/

.claude/skills/_shared/SKILL-DESIGN-SPEC.md

@@ -140,7 +140,7 @@ graph TD
 ---
 name: {skill-name}
 description: {一句话描述}. {触发关键词}. Triggers on "{关键词1}", "{关键词2}".
-allowed-tools: Task, AskUserQuestion, Read, Bash, Glob, Grep, Write, {其他MCP工具}
+allowed-tools: Agent, AskUserQuestion, Read, Bash, Glob, Grep, Write, {其他MCP工具}
 ---
 
 # {Skill 标题}
@@ -192,7 +192,7 @@ description: |                # 必需：描述 + 触发词
   Generate XXX documents. 
   Triggers on "keyword1", "keyword2".
 allowed-tools: |              # 必需：允许使用的工具
-  Task, AskUserQuestion, Read, Bash, 
+  Agent, AskUserQuestion, Read, Bash,
   Glob, Grep, Write, mcp__chrome__*
 ---
 ```
@@ -641,7 +641,7 @@ touch my-skill/templates/agent-base.md
 ---
 name: my-skill
 description: Generate XXX. Triggers on "keyword1", "keyword2".
-allowed-tools: Task, AskUserQuestion, Read, Bash, Glob, Grep, Write
+allowed-tools: Agent, AskUserQuestion, Read, Bash, Glob, Grep, Write
 ---
 
 # My Skill
@@ -680,7 +680,7 @@ Generate XXX through multi-phase analysis.
 
 | 工具 | 用途 | 适用 Skill |
 |------|------|------------|
-| `Task` | 启动子 Agent | 所有 |
+| `Agent` | 启动子 Agent | 所有 |
 | `AskUserQuestion` | 用户交互 | 所有 |
 | `Read/Write/Glob/Grep` | 文件操作 | 所有 |
 | `Bash` | 脚本执行 | 需要自动化 |