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/ui-design/generate.md

@@ -2,7 +2,7 @@
 name: generate
 description: Assemble UI prototypes by combining layout templates with design tokens (default animation support), pure assembler without new content generation
 argument-hint: [--design-id <id>] [--session <id>]
-allowed-tools: TodoWrite(*), Read(*), Write(*), Task(ui-design-agent), Bash(*)
+allowed-tools: TodoWrite(*), Read(*), Write(*), Agent(ui-design-agent), Bash(*)
 ---
 
 # Generate UI Prototypes (/workflow:ui-design:generate)
@@ -129,7 +129,7 @@ ELSE:
 
 ## Phase 2: Assembly (Agent)
 
-**Executor**: `Task(ui-design-agent)` grouped by `target × style` (max 10 layouts per agent, max 6 concurrent agents)
+**Executor**: `Agent(ui-design-agent)` grouped by `target × style` (max 10 layouts per agent, max 6 concurrent agents)
 
 **⚠️ Core Principle**: **Each agent processes ONLY ONE style** (but can process multiple layouts for that style)
 
@@ -204,7 +204,7 @@ TodoWrite({todos: [
 For each batch (up to 6 parallel agents per batch):
 For each agent group `{target, style_id, layout_ids[]}` in current batch:
 ```javascript
-Task(ui-design-agent): `
+Agent(ui-design-agent): `
   [LAYOUT_STYLE_ASSEMBLY]
   🎯 {target} × Style-{style_id} × Layouts-{layout_ids}
   ⚠️ CONSTRAINT: Use ONLY style-{style_id}/design-tokens.json (never mix styles)