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/templates/skill-md.md

@@ -223,7 +223,7 @@ function filterDocsByPhase(specs, phase, phaseIndex) {
 ---
 name: api-docs-generator
 description: Generate API documentation from source code. Triggers on "generate api docs", "api documentation".
-allowed-tools: Task, Read, Write, Glob, Grep, Bash
+allowed-tools: Agent, Read, Write, Glob, Grep, Bash
 ---
 
 # API Docs Generator
@@ -265,7 +265,7 @@ Phase 3: Generation      → api-docs.md
 ---
 name: task-manager
 description: Interactive task management with CRUD operations. Triggers on "manage tasks", "task list".
-allowed-tools: Task, AskUserQuestion, Read, Write
+allowed-tools: Agent, AskUserQuestion, Read, Write
 ---
 
 # Task Manager