- Move ShortcutStoreTests from AcDream.Core.Tests to AcDream.Core.Net.Tests (Rule 6:
tests live in the project matching the layer under test; ShortcutStore is Core.Net)
- Replace fully-qualified System.Buffers.Binary.BinaryPrimitives. with BinaryPrimitives.
in the two new BuildAddShortcut tests (file already has `using System.Buffers.Binary`)
- Add `using System;` to ShortcutStore.cs; change System.Array.Clear → Array.Clear
(matches sibling file style, no behavior change)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>