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/spec-generator/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: spec-generator
 description: Specification generator - 6 phase document chain producing product brief, PRD, architecture, and epics. Triggers on "generate spec", "create specification", "spec generator", "workflow:spec".
-allowed-tools: Task, AskUserQuestion, TaskCreate, TaskUpdate, TaskList, Read, Write, Edit, Bash, Glob, Grep, Skill
+allowed-tools: Agent, AskUserQuestion, TaskCreate, TaskUpdate, TaskList, Read, Write, Edit, Bash, Glob, Grep, Skill
 ---
 
 # Spec Generator

.claude/skills/spec-generator/phases/01-discovery.md

@@ -117,7 +117,7 @@ const hasCodebase = Glob('**/*.{ts,js,py,java,go,rs}').length > 0
   || Glob('Cargo.toml').length > 0;
 
 if (hasCodebase) {
-  Task({
+  Agent({
     subagent_type: "cli-explore-agent",
     run_in_background: false,
     description: `Explore codebase for spec: ${slug}`,