[P1] Stub Cleanup: Remove tools/missing/ directory

[Delqhi]

Task

Remove the 17 unused tool stub files from tools/missing/.

Files to remove

SleepTool.ts, CtxInspectTool.ts, MonitorTool.ts, SnipTool.ts, ListPeersTool.ts, WebBrowserTool.ts, TerminalCaptureTool.ts, SubscribePRTool.ts, PushNotificationTool.ts, SendUserFileTool.ts, VerifyPlanExecutionTool.ts, REPLTool.ts, SuggestBackgroundPRTool.ts, WorkflowTool.ts, RemoteTriggerTool.ts, PowerShellTool.ts, index.ts

Why

These are staging stubs — all 14 real implementations already exist under packages/opensin-sdk/src/core/tools/. Keeping stubs causes confusion.

Validation

grep -r "from.*tools/missing" . --include="*.ts" | wc -l = 0

Linked Epic

Epic #1089

[Delqhi]

Complete: Removed 17 tool stubs from tools/missing/. Commit 7f232a3. Real implementations exist in packages/opensin-sdk/src/core/tools/.

[github-actions]

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.