[Library Sync][Arduino] DoubleLinkedList -> braydenanderson2014/ArduinoDoubleLinkedList

<!-- library-sync-request --> <!-- auto-library-sync-request --> <!-- sync-template-variant: arduino --> <!-- generated-at: 2026-08-07T20:21:43.483Z --> ### Library DoubleLinkedList ### Pull request title Sync DoubleLinkedList from monorepo (auto) ### Target branch override _No response_ ### Sync summary Auto-generated sync request based on detected monorepo changes. - Source path: lib/DoubleLinkedList - Target repository: braydenanderson2014/ArduinoDoubleLinkedList - Template variant: arduino - Detected from: push (refs/heads/main) - Compare: https://github.com/braydenanderson2014/C-Arduino-Libraries/compare/5e5af7014d738f1dffb948430d6785004d7f4bc6...0b586ac76a576ffe6bcbce27840c2ed8c54a8566 - Commit highlights: - Back-sync DoubleLinkedList from remote PR #2 (f9e30fb) ### Pull request notes Auto-created by workflow: auto-library-sync-issues.yml Review generated summary and edit before processing if needed. ### Confirmations - [x] I verified the library folder in this monorepo is ready to sync. - [x] I understand this workflow only syncs configured library-managed paths, not the full repository.