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-tuning/phases/actions/action-diagnose-agent.md

@@ -193,7 +193,7 @@ async function execute(state, workDir) {
       type: 'agent_failure',
       severity: 'medium',
       location: { file: 'SKILL.md' },
-      description: 'Task tool used but not declared in allowed-tools',
+      description: 'Agent tool used but not declared in allowed-tools',
       evidence: [`${totalCalls} Task calls found, but Task not in allowed-tools`],
       root_cause: 'Tool declaration mismatch',
       impact: 'May cause runtime permission issues',