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-skill-designer/phases/03-phase-design.md

@@ -303,7 +303,7 @@ function generatePhaseFromRequirements(phase, config) {
     for (const agentType of phase.agentTypes) {
       phaseContent += `### Step: ${agentType} Delegation\n\n`;
       phaseContent += '```javascript\n';
-      phaseContent += `const result = Task({\n`;
+      phaseContent += `const result = Agent({\n`;
       phaseContent += `  subagent_type: "${mapAgentType(agentType)}",\n`;
       phaseContent += `  prompt: \`\n`;
       phaseContent += `    [ROLE] ${agentType}\n`;