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/commands/issue/queue.md

@@ -2,7 +2,7 @@
 name: queue
 description: Form execution queue from bound solutions using issue-queue-agent (solution-level)
 argument-hint: "[-y|--yes] [--queues <n>] [--issue <id>]"
-allowed-tools: TodoWrite(*), Task(*), Bash(*), Read(*), Write(*)
+allowed-tools: TodoWrite(*), Agent(*), Bash(*), Read(*), Write(*)
 ---
 
 ## Auto Mode
@@ -247,7 +247,7 @@ if (numQueues === 1) {
       description=`Queue ${i + 1}/${numQueues}: ${group.length} solutions`
     )
   );
-  // All agents launched in parallel via single message with multiple Task tool calls
+  // All agents launched in parallel via single message with multiple Agent tool calls
 }
 ```