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/

ccw/frontend/src/locales/en/team.json

@@ -47,6 +47,9 @@
     "artifacts": "Artifacts",
     "messages": "Messages"
   },
+  "error": {
+    "loadFailed": "Failed to Load Team Data"
+  },
   "artifacts": {
     "title": "Team Artifacts",
     "plan": "Plan",

ccw/frontend/src/locales/zh/team.json

@@ -47,6 +47,9 @@
     "artifacts": "产物",
     "messages": "消息"
   },
+  "error": {
+    "loadFailed": "加载团队数据失败"
+  },
   "artifacts": {
     "title": "团队产物",
     "plan": "计划",