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/issue-manage/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: issue-manage
 description: Interactive issue management with menu-driven CRUD operations. Use when managing issues, viewing issue status, editing issue fields, performing bulk operations, or viewing issue history. Triggers on "manage issue", "list issues", "edit issue", "delete issue", "bulk update", "issue dashboard", "issue history", "completed issues".
-allowed-tools: Bash, Read, Write, AskUserQuestion, Task, Glob
+allowed-tools: Bash, Read, Write, AskUserQuestion, Agent, Glob
 ---
 
 # Issue Management Skill
@@ -219,9 +219,8 @@ const action = AskUserQuestion({
     header: 'Action',
     options: [
       { label: 'List Issues', description: 'Browse active issues' },
-      { label: 'View Issue', description: 'Detail view' },
+      { label: 'View Issue', description: 'Detail view (includes history)' },
       { label: 'Edit Issue', description: 'Modify fields' },
-      { label: 'View History', description: 'Completed issues' },
       { label: 'Bulk Operations', description: 'Batch actions' }
     ]
   }]