AX Agent 레거시 plan 도구 registry와 상태 라벨을 추가 정리

- ToolRegistry, SkillService, AgentLoopService에서 enter_plan_mode/exit_plan_mode 등록과 별칭 제거

- AppStateService runtime label을 실행/권한 대기/백그라운드 중심으로 단순화해 queue 메타 기본 노출 축소

- README와 DEVELOPMENT 문서에 2026-04-05 20:56 (KST) 기준 변경 내역과 parity 재평가 반영

- 검증: dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify\\ -p:IntermediateOutputPath=obj\\verify\\ (경고 0 / 오류 0)

src/AxCopilot/Services/Agent/AgentLoopService.cs

@@ -3619,8 +3619,6 @@ public partial class AgentLoopService
         ["taskupdate"] = "task_update",
         ["taskstop"] = "task_stop",
         ["taskoutput"] = "task_output",
-        ["enterplanmode"] = "enter_plan_mode",
-        ["exitplanmode"] = "exit_plan_mode",
         ["enterworktree"] = "enter_worktree",
         ["exitworktree"] = "exit_worktree",
         ["teamcreate"] = "team_create",

src/AxCopilot/Services/Agent/SkillService.cs

@@ -470,8 +470,6 @@ public static class SkillService
         ["TaskUpdate"] = "task_update",
         ["TaskStop"] = "task_stop",
         ["TaskOutput"] = "task_output",
-        ["EnterPlanMode"] = "enter_plan_mode",
-        ["ExitPlanMode"] = "exit_plan_mode",
         ["EnterWorktree"] = "enter_worktree",
         ["ExitWorktree"] = "exit_worktree",
         ["TeamCreate"] = "team_create",

src/AxCopilot/Services/Agent/ToolRegistry.cs

@@ -187,8 +187,6 @@ public class ToolRegistry : IDisposable
         registry.Register(new TaskUpdateTool());
         registry.Register(new TaskStopTool());
         registry.Register(new TaskOutputTool());
-        registry.Register(new EnterPlanModeTool());
-        registry.Register(new ExitPlanModeTool());
         registry.Register(new EnterWorktreeTool());
         registry.Register(new ExitWorktreeTool());
         registry.Register(new TeamCreateTool());