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-issue/role-specs/explorer.md

@@ -53,7 +53,7 @@ Bash("ccw issue status <issueId> --json")
 | Complexity | Execution |
 |------------|-----------|
 | Low | Direct ACE search: `mcp__ace-tool__search_context(project_root_path, query)` |
-| Medium/High | Spawn cli-explore-agent: `Task({ subagent_type: "cli-explore-agent", run_in_background: false })` |
+| Medium/High | Spawn cli-explore-agent: `Agent({ subagent_type: "cli-explore-agent", run_in_background: false })` |
 
 **cli-explore-agent prompt template**:
 

.claude/skills/team-issue/role-specs/implementer.md

@@ -15,7 +15,7 @@ Load solution plan, route to execution backend (Agent/Codex/Gemini), run tests,
 
 | Backend | Condition | Method |
 |---------|-----------|--------|
-| agent | task_count <= 3 or explicit | `Task({ subagent_type: "code-developer", run_in_background: false })` |
+| agent | task_count <= 3 or explicit | `Agent({ subagent_type: "code-developer", run_in_background: false })` |
 | codex | task_count > 3 or explicit | `ccw cli --tool codex --mode write --id issue-<issueId>` |
 | gemini | explicit | `ccw cli --tool gemini --mode write --id issue-<issueId>` |
 
@@ -69,7 +69,7 @@ Dependencies: <explorerContext.dependencies>
 ```
 
 Route by executor:
-- **agent**: `Task({ subagent_type: "code-developer", run_in_background: false, prompt: <prompt> })`
+- **agent**: `Agent({ subagent_type: "code-developer", run_in_background: false, prompt: <prompt> })`
 - **codex**: `Bash("ccw cli -p \"<prompt>\" --tool codex --mode write --id issue-<issueId>")`
 - **gemini**: `Bash("ccw cli -p \"<prompt>\" --tool gemini --mode write --id issue-<issueId>")`
 

.claude/skills/team-issue/role-specs/integrator.md

@@ -39,7 +39,7 @@ Bash("ccw issue solutions <issueId> --json")
 **Agent invocation**:
 
 ```
-Task({
+Agent({
   subagent_type: "issue-queue-agent",
   run_in_background: false,
   description: "Form queue for <count> issues",

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

@@ -40,7 +40,7 @@ Read("<session>/explorations/context-<issueId>.json")
 **Agent invocation**:
 
 ```
-Task({
+Agent({
   subagent_type: "issue-plan-agent",
   run_in_background: false,
   description: "Plan solution for <issueId>",