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/workflow-execute/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: workflow-execute
 description: Coordinate agent execution for workflow tasks with automatic session discovery, parallel task processing, and status tracking. Triggers on "workflow-execute".
-allowed-tools: Skill, Task, AskUserQuestion, TaskCreate, TaskUpdate, TaskList, Read, Write, Edit, Bash, Glob, Grep
+allowed-tools: Skill, Agent, AskUserQuestion, TaskCreate, TaskUpdate, TaskList, Read, Write, Edit, Bash, Glob, Grep
 ---
 
 # Workflow Execute
@@ -500,7 +500,7 @@ TodoWrite({
 **Path-Based Invocation**: Pass paths and trigger markers, let agent parse task JSON autonomously.
 
 ```bash
-Task(subagent_type="{meta.agent}",
+Agent(subagent_type="{meta.agent}",
      run_in_background=false,
      prompt="Implement task {task.id}: {task.title}