Add Devin agent to harbor-cli skill

[benediktstroebl]

What changed

Syncs skills/harbor-cli with upstream harbor-framework/harbor commit 3fa843de (merged 2026-05-07), which added the Devin CLI agent.

Skills updated

harbor-cli — Added Devin (devin) to the Supported Agents table. Devin requires WINDSURF_API_KEY passed via --ae. Also noted Devin's model-name behaviour (provider prefix is stripped) in the Common Gotchas section.

Skills not affected

• harbor-adapter-creator — Devin follows the same BaseInstalledAgent interface as other agents; no adapter authoring patterns changed.
• harbor-task-creator — No changes to task structure, verifier contract, or reward file handling.

The other upstream commits in this window (oracle bug fix 51699724, rewardkit updates 0d29d9e6/9af92878/ea06c117) are either internal fixes or confined to the packages/rewardkit sub-package, which none of the three skills document.

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