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/commands/workflow/unified-execute-with-file.md

@@ -2,7 +2,7 @@
 name: unified-execute-with-file
 description: Universal execution engine for consuming any planning/brainstorm/analysis output with minimal progress tracking, multi-agent coordination, and incremental execution
 argument-hint: "[-y|--yes] [<path>[,<path2>] | -p|--plan <path>[,<path2>]] [--auto-commit] [--commit-prefix \"prefix\"] [\"execution context or task name\"]"
-allowed-tools: TodoWrite(*), Task(*), AskUserQuestion(*), Read(*), Grep(*), Glob(*), Bash(*), Edit(*), Write(*)
+allowed-tools: TodoWrite(*), Agent(*), AskUserQuestion(*), Read(*), Grep(*), Glob(*), Bash(*), Edit(*), Write(*)
 ---
 
 ## Auto Mode
@@ -34,7 +34,7 @@ When `--yes` or `-y`: Auto-confirm execution decisions, follow plan's DAG depend
 ```
 
 **Execution Methods**:
-- **Agent**: Task tool with code-developer (recommended for standard tasks)
+- **Agent**: Agent tool with code-developer (recommended for standard tasks)
 - **CLI-Codex**: `ccw cli --tool codex` (complex tasks, git-aware)
 - **CLI-Gemini**: `ccw cli --tool gemini` (analysis-heavy tasks)
 - **Auto**: Select based on task complexity (default in `-y` mode)
@@ -99,7 +99,7 @@ Universal execution engine consuming **any** planning output and executing it wi
 │  Phase 5: Per-Task Execution (Agent OR CLI)                             │
 │     ├─ Extract relevant notes from previous tasks                       │
 │     ├─ Inject notes into execution context                              │
-│     ├─ Route to Agent (Task tool) OR CLI (ccw cli command)              │
+│     ├─ Route to Agent (Agent tool) OR CLI (ccw cli command)              │
 │     ├─ Generate structured notes for next task                          │
 │     ├─ Auto-commit if enabled (conventional commit format)              │
 │     └─ Append event to unified log                                      │
@@ -507,10 +507,10 @@ ${recommendations.map(r => \`- ${r}\`).join('\\n')}
 
    When: `executionMethod === "Agent"` or `Auto + Low Complexity`
 
-   Execute task via Task tool with code-developer agent:
+   Execute task via Agent tool with code-developer agent:
 
    ```javascript
-   Task({
+   Agent({
      subagent_type: "code-developer",  // or other agent types
      run_in_background: false,
      description: task.title,