초기 커밋: Phase 1 — 레지스트리 기반 컨텍스트 메뉴 + 핵심 변환 파이프라인

- Provider 추상화(IConverterProvider + ProviderCapability) — Available/RequiresExternal/ComingSoon 1급 시민
- 변환 구현: Magick(이미지·RAW·GIF·TIFF), HEIC/HEIF(libheif decode→Magick encode), PDF(PDFium), DOCX(Word COM 또는 LibreOffice 자동 감지)
- ComingSoon 스텁: HTML, HWP/HWPX (UI 노출, 컨텍스트 메뉴 등록 자동 제외)
- WPF + WPF-UI 4.3 Fluent 2 UI: 메인 창(드래그&드롭, Provider 카드), 변환 창(썸네일·옵션·진행률), 빠른 변환 진행 창, 진단 창
- 단일 EXE에 verb 라우팅: quick / dialog / register / unregister / diagnose / help
- HKCU SystemFileAssociations 기반 컨텍스트 메뉴 등록 (Win11 "추가 옵션 표시"에 노출)
- README, packaging/ Phase 2 placeholder 포함

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/EverythingToJpeg.Core/ConvertOptions.cs

@@ -0,0 +1,40 @@
+namespace EverythingToJpeg.Core;
+
+public enum OutputLocation
+{
+    SubfolderBesideSource,
+    SameFolderAsSource,
+    Custom
+}
+
+public enum NameCollision
+{
+    AppendNumber,
+    Overwrite,
+    Skip
+}
+
+public sealed class ConvertOptions
+{
+    public int Quality { get; set; } = 92;
+
+    public OutputLocation OutputLocation { get; set; } = OutputLocation.SubfolderBesideSource;
+
+    public string SubfolderSuffix { get; set; } = "_jpeg";
+
+    public string? CustomOutputDirectory { get; set; }
+
+    public NameCollision OnCollision { get; set; } = NameCollision.AppendNumber;
+
+    public int? MaxLongEdgePixels { get; set; }
+
+    public int PdfDpi { get; set; } = 200;
+
+    public bool KeepExifWhenPossible { get; set; } = true;
+
+    public bool FlattenTransparency { get; set; } = true;
+
+    public string TransparencyBackground { get; set; } = "#FFFFFF";
+
+    public static ConvertOptions Quick() => new();
+}