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/team-lifecycle/role-specs/analyst.md

@@ -47,7 +47,7 @@ EXPECTED: JSON with: problem_statement, target_users[], domain, constraints[], e
 **When project detected**: Call explore subagent with `angle: general`, `keywords: <from seed analysis>`.
 
 ```
-Task({
+Agent({
   subagent_type: "cli-explore-agent",
   run_in_background: false,
   description: "Explore general context",

.claude/skills/team-lifecycle/role-specs/executor.md

@@ -42,7 +42,7 @@ message_types:
 
 | Backend | Invocation | Use Case |
 |---------|-----------|----------|
-| agent | `Task({ subagent_type: "code-developer", run_in_background: false })` | Simple, direct edits |
+| agent | `Agent({ subagent_type: "code-developer", run_in_background: false })` | Simple, direct edits |
 | codex | `ccw cli --tool codex --mode write` (background) | Complex, architecture |
 | gemini | `ccw cli --tool gemini --mode write` (background) | Analysis-heavy |
 

.claude/skills/team-lifecycle/role-specs/fe-developer.md

@@ -42,7 +42,7 @@ message_types:
 
 | Task Size | Strategy |
 |-----------|----------|
-| Simple (<= 3 files, single component) | `Task({ subagent_type: "code-developer", run_in_background: false })` |
+| Simple (<= 3 files, single component) | `Agent({ subagent_type: "code-developer", run_in_background: false })` |
 | Complex (system, multi-component) | `ccw cli --tool gemini --mode write` (background) |
 
 **Coding standards** (include in agent/CLI prompt):

.claude/skills/team-lifecycle/role-specs/planner.md

@@ -33,7 +33,7 @@ If `<session-folder>/spec/` exists → load requirements/_index.md, architecture
 For each angle, call explore subagent (cache-aware — check cache-index.json before each call):
 
 ```
-Task({
+Agent({
   subagent_type: "cli-explore-agent",
   run_in_background: false,
   description: "Explore <angle>",
@@ -53,7 +53,7 @@ Task({
 **Agent call** (Medium/High):
 
 ```
-Task({
+Agent({
   subagent_type: "cli-lite-planning-agent",
   run_in_background: false,
   description: "Generate implementation plan",

.claude/skills/team-lifecycle/role-specs/writer.md

@@ -61,7 +61,7 @@ message_types:
 Do NOT execute CLI calls in main agent. Delegate to subagent:
 
 ```
-Task({
+Agent({
   subagent_type: "universal-executor",
   run_in_background: false,
   description: "Generate <doc-type> document",