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/skill-generator/specs/cli-integration.md

@@ -12,7 +12,7 @@ Suitable for scenarios that need immediate results.
 
 ```javascript
 // Agent call - synchronous
-const result = Task({
+const result = Agent({
   subagent_type: 'universal-executor',
   prompt: 'Execute task...',
   run_in_background: false  // Key: synchronous execution
@@ -77,7 +77,7 @@ ccw cli -p "<PROMPT>" --tool <gemini|qwen|codex> --mode <analysis|write>
 General-purpose executor, the most commonly used agent type.
 
 ```javascript
-Task({
+Agent({
   subagent_type: 'universal-executor',
   prompt: `
 Execute task:
@@ -99,7 +99,7 @@ Execute task:
 Code exploration agent for quick codebase understanding.
 
 ```javascript
-Task({
+Agent({
   subagent_type: 'Explore',
   prompt: `
 Explore src/ directory:
@@ -123,7 +123,7 @@ Thoroughness: medium
 Deep code analysis agent.
 
 ```javascript
-Task({
+Agent({
   subagent_type: 'cli-explore-agent',
   prompt: `
 Deep analysis of src/auth/ module: