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/01-requirements-analysis.md

@@ -216,7 +216,7 @@ const workflowConfig = {
   title: "Workflow Plan",               // Human-readable
   description: "5-phase planning...",   // One-line description
   triggers: ["workflow-plan"],          // Trigger phrases
-  allowedTools: ["Task", "AskUserQuestion", "TodoWrite", "Read", "Write", "Edit", "Bash", "Glob", "Grep", "Skill"],
+  allowedTools: ["Agent", "AskUserQuestion", "TodoWrite", "Read", "Write", "Edit", "Bash", "Glob", "Grep", "Skill"],
 
   // Source information
   source: {