v2.0.0-preview.4

日本語のリリースノートはこちらです。

What's Changed

Windows

• Installer
• Installer (.NET Runtime required)

macOS

• Zip (arm64)
• Zip (x64)

Linux

• Debian package
• Flatpak
• Zip (.NET Runtime required)
• Zip

New Features

• Added Ctrl+Shift+P command palette for quickly searching and executing commands
• Added history view with jump-to-step for navigating the undo history
• Added 2D transform handles on the preview for directly manipulating position, scale, and rotation
• Added keyboard shortcuts for nudging timeline elements, duplicating clips (Ctrl+D / Alt+drag), and seeking to the next/previous keyframe
• Added a Go-to-timecode dialog for precise playhead positioning in the player
• Added onion-skin overlay to the preview player
• Moved player settings to a dedicated Preview Settings tool tab
• Added an "Add Adjustment Layer" menu entry to the editor
• Implemented resolution-independent rendering pipeline — effects and filters now scale correctly at any output resolution (breaking change)
• Added audio effects:
  • Compressor
  • Limiter (brick-wall peak limiter)
• Added Flatpak packaging for Linux distribution
• Expanded telemetry sensitive-data redaction

Improvements & Refactoring

• Refactored Timeline editing to route through a dedicated editor services layer, improving plugin extensibility (breaking change)
• Removed many deprecated and dead API surfaces, including the legacy encoder pipeline, obsolete ISample structs, dead Configuration surface, BcTabView/BcTabItem controls, unused byte-LUT chain, ICanvas/INode/GraphicsException, and ProjectService/EditorService/ExtensionProvider singletons — all breaking changes
• Made IFrameProvider/ISampleProvider implement IDisposable for reliable resource cleanup (breaking change)
• Removed MediaFoundation DXVA2/audio dead paths and no-op settings (breaking change)
• Removed the in-process FFmpeg path; collapsed the FFmpegOutOfProcess configuration axis (breaking change)
• Relocated IPC frame/sample providers to the MIT-licensed Beutl.FFmpegIpc project
• Multiple performance improvements:
  • Pooled per-sample speed buffers in SpeedNode
  • Reused onion-skin snapshot bitmap during compositing
  • Made FFmpeg codec property editors async and cached
  • Shared FFmpegOptionsCache across editor instances to reduce IPC round-trips
  • Reused the retained buffer for same-frame re-requests in IpcFrameProvider
• Upgraded ReactiveUI.Avalonia and Dock.Avalonia packages

Bug Fixes

• File compatibility: Fixed deserialization of legacy 1.x element files missing the $type discriminator
• Editor:
  • Fixed index out-of-range error when dragging gradient color stops
  • Fixed output profiles being overwritten on restore failure
  • Fixed corrupt config files causing crashes (JSON errors now caught gracefully)
  • Fixed scene failing to open when the view state config was corrupt
  • Fixed partial relocation failures not being reported during project export
  • Fixed history mutation not pausing playback; scene settings are now applied correctly after pause
• Player / Preview:
  • Fixed transform-handle overlay blocking the UI during playback
  • Fixed onion-skin config being read off the UI thread
• Audio:
  • Fixed audio resampler not being disposed during FFmpeg encoding cleanup
  • Fixed UseGlobalClock and parent-relative time not being respected in audio animations
  • Fixed silent audio buffer sample count alignment
  • Fixed limiter deque overflow during audio release
  • Fixed integer overflow in audio/media sample-index conversions
  • Fixed waveform thumbnail sample math overflow
  • Multiple audio buffer leak fixes across audio graph nodes
• FFmpeg / Video:
  • Fixed FFmpeg install dialog not appearing when worker libraries were missing
  • Fixed FFmpeg worker not respecting BEUTL_HOME when locating libraries
  • Fixed IpcFrameProvider returning the wrong frame on non-sequential requests
  • Multiple IpcFrameProvider/IpcSampleProvider reliability fixes (leak guards, size validation, prefetch, EOF clamping)
  • Fixed encode cancellation not being surfaced as OperationCanceledException
  • Fixed FFmpeg seek returning -22 Invalid argument when seeking past EOF
• Engine / Rendering:
  • Fixed multiple FormattedText resource leaks and use-after-dispose bugs
  • Fixed integer overflow in Animator interpolation
  • Fixed video thumbnail count against degenerate frame sizes
  • Fixed double-dispose in rasterize paths when an operation throws on Dispose
  • Fixed SKColorFilter leak in ParticleRenderNode
• MediaFoundation (Windows):
  • Fixed resource cleanup and initialization failure handling across MFReader and MFDecoder
  • Fixed frame buffer size overflow
  • Fixed video-only files not opening correctly in AudioVideo mode
• Stability:
  • Fixed NotificationService crash and UI thread starvation
  • Fixed TimeRange.IsEmpty returning wrong result for zero-duration ranges
  • Fixed thread-safety race in the shutdown/wait path
  • Fixed encoder extension matching to be case-insensitive
  • Fixed keyframe animations being skipped when parent offset was unresolvable
  • Rolled back project state when persistence fails
  • Rolled back failed extension loads in the API layer
  • Hardened Counter<T> against reorder and AddRef TOCTOU races
  • Hardened IpcConnection cancellation handling in the multiplexed path

Changelog

• ci: add scheduled code review workflow posting to Projects v2 by @yuto-trd in #1766
• build(deps): bump actions/checkout from 4 to 6 by @dependabot[bot] in #1769
• feat: Expand telemetry sensitive-data redaction by @yuto-trd in #1770
• fix: deserialize 1.x Element files missing $type discriminator by @yuto-trd in #1771
• fix: dispose audio resampler in FFmpeg encoding cleanup by @yuto-trd in #1772
• feat: Add Ctrl+Shift+P command palette for searchable commands by @yuto-trd in #1776
• test: Expand unit-test coverage across Core, Engine, Utilities by @yuto-trd in #1778
• test: Expand unit-test coverage across Core, Graphics, Utilities by @yuto-trd in #1783
• fix(command-palette): address remaining PR #1776 review comments by @yuto-trd in #1779
• feat: add history view with jump-to-step by @yuto-trd in #1780
• fix: dispose SKColorFilter in ParticleRenderNode by @yuto-trd in #1788
• fix: surface FFmpeg install dialog when worker libraries are missing by @yuto-trd in #1786
• feat: add Flatpak packaging for Linux distribution by @yuto-trd in #1784
• feat: route FFmpegWorker logs to host logger by @yuto-trd in #1787
• fix: prevent NotificationService crash and UI thread starvation by @yuto-trd in #1789
• build(deps): bump actions/cache from 4 to 5 by @dependabot[bot] in #1790
• fix: exclude AVFoundation extension from Linux/Windows builds by @yuto-trd in #1795
• Bump Microsoft.Extensions.ObjectPool from 10.0.7 to 10.0.8 by @dependabot[bot] in #1805
• Bump Microsoft.Extensions.DependencyInjection and Microsoft.Extensions.Logging by @dependabot[bot] in #1803
• Bump Microsoft.Extensions.Logging.Console from 10.0.7 to 10.0.8 by @dependabot[bot] in #1804
• Bump Microsoft.Extensions.FileSystemGlobbing from 10.0.7 to 10.0.8 by @dependabot[bot] in #1802
• Bump Microsoft.Extensions.DependencyModel from 10.0.7 to 10.0.8 by @dependabot[bot] in #1801
• Bump System.CommandLine from 2.0.7 to 2.0.8 by @dependabot[bot] in #1816
• Bump NuGet.Protocol and NuGet.Resolver by @dependabot[bot] in #1814
• Bump Microsoft.Extensions.TimeProvider.Testing from 10.5.0 to 10.6.0 by @dependabot[bot] in #1811
• Bump NuGet.ProjectModel from 7.3.1 to 7.6.0 by @dependabot[bot] in #1812
• Bump System.Management from 10.0.7 to 10.0.8 by @dependabot[bot] in #1817
• fix: avoid ObjectDisposedException on PlayerViewModel dispose by @yuto-trd in #1798
• fix: prevent index out-of-range when dragging gradient stops by @yuto-trd in #1799
• fix: protect output profiles from overwrite on restore failure by @yuto-trd in #1809
• fix: catch JsonException in JsonRestore for corrupt config files (#1807) by @yuto-trd in #1810
• feat: add debug-only main window capture to MP4 by @yuto-trd in #1796
• fix: respect UseGlobalClock and parent local time in audio animations by @yuto-trd in #1818
• ci: register published release assets to beutl-reflect-release API by @yuto-trd in #1819
• fix: correct TimeRange.IsEmpty for zero duration by @yuto-trd in #1820
• fix: align silent audio buffer sample count with ceiling by @yuto-trd in #1821
• fix: prevent crash from async void in EditorHostViewModel by @yuto-trd in #1822
• fix: harden Counter against reorder and AddRef TOCTOU races by @yuto-trd in #1823
• feat: Add keyboard nudge shortcuts for timeline elements by @yuto-trd in #1824
• fix: keep scene openable when view state config is corrupt by @yuto-trd in #1825
• fix: harden cancellation handling in IpcConnection multiplexed path by @yuto-trd in #1826
• fix: surface partial relocation failures during project export by @yuto-trd in #1827
• docs: expand PR template with guidance and Test plan section by @yuto-trd in #1833
• feat: add clip duplication via Ctrl+D and Alt+drag by @yuto-trd in #1828
• feat: add 2D transform handles for direct preview manipulation by @yuto-trd in #1782
• fix: avoid overflow in integer Animator interpolation by @yuto-trd in #1830
• feat: Add goto timecode for player playhead seeking by @yuto-trd in #1829
• build(deps): bump actions/github-script from 7 to 9 by @dependabot[bot] in #1835
• chore: scaffold AI-native development workflow by @yuto-trd in #1837
• feat: Add next/previous key frame seek commands by @yuto-trd in #1831
• chore: expand AI workflow scaffolding (per-module anchors, pre-PR skill, statusline, etc.) by @yuto-trd in #1839
• feat: add Spec-Kit git extension hooks by @yuto-trd in #1840
• Bump NUnit from 4.6.0 to 4.6.1 by @dependabot[bot] in #1842
• chore: install .NET SDK in Claude Code on the web sessions by @yuto-trd in #1844
• fix: localize 3D camera mode tooltips in PlayerView by @yuto-trd in #1847
• fix: ensure all FFmpeg native resources are disposed when one Dispose throws by @yuto-trd in #1848
• fix: close TOCTOU race in FFmpegInstallNotifier throttle by @yuto-trd in #1849
• build(deps): bump dotnet/nbgv from 0.5.1 to 0.5.2 by @dependabot[bot] in #1846
• Bump coverlet.collector from 10.0.0 to 10.0.1 by @dependabot[bot] in #1836
• feat: Add onion skin overlay to the preview player by @yuto-trd in #1861
• docs: improve contributor onboarding and add SECURITY/CODEOWNERS by @yuto-trd in #1860
• Bump HarfBuzzSharp.NativeAssets.Linux from 8.3.1.3 to 8.3.1.5 by @dependabot[bot] in #1853
• Bump SkiaSharp.NativeAssets.Linux from 3.119.2 to 3.119.4 by @dependabot[bot] in #1856
• Bump Microsoft.NET.Test.Sdk from 18.5.1 to 18.6.0 by @dependabot[bot] in #1859
• Bump Avalonia and Avalonia.Diagnostics by @dependabot[bot] in #1858
• Bump HarfBuzzSharp, SkiaSharp and SkiaSharp.HarfBuzz by @dependabot[bot] in #1855
• Bump Avalonia.Themes.Fluent from 11.3.13 to 11.3.17 by @dependabot[bot] in #1866
• Bump Avalonia.Desktop from 11.3.13 to 11.3.17 by @dependabot[bot] in #1865
• refactor!: route Timeline editing through Beutl.Editor.Services by @yuto-trd in #1845
• Upgrade package versions for ReactiveUI.Avalonia and Dock.Avalonia by @yuto-trd in #1869
• fix: harden Dispatcher timer wait and resource disposal by @yuto-trd in #1870
• docs: document follow-up task capture in AGENTS.md by @yuto-trd in #1871
• perf(engine): pool per-sample speed buffer in SpeedNode.ProcessAnimatedSpeed by @yuto-trd in #1872
• docs(ai-workflow): add beutl-ai-review-task skill by @yuto-trd in #1873
• feat: migrate player settings to a Preview Settings tool tab by @yuto-trd in #1875
• refactor(engine): consolidate Delay parameter constants into DelayParameters by @yuto-trd in #1876
• refactor(engine): unify DelayNode/GainNode animation guard to Animation != null by @yuto-trd in #1877
• feat: Add audio Compressor effect by @yuto-trd in #1724
• fix(core): roll back project state when persist fails by @yuto-trd in #1878
• docs: shorten recently added code comments by @yuto-trd in #1879
• Bump Microsoft.Extensions.DependencyModel from 10.0.8 to 10.0.9 by @dependabot[bot] in #1882
• Bump Microsoft.Extensions.FileSystemGlobbing from 10.0.8 to 10.0.9 by @dependabot[bot] in #1883
• Bump Microsoft.Extensions.DependencyInjection and Microsoft.Extensions.Logging by @dependabot[bot] in #1884
• Bump Microsoft.Extensions.Logging.Console from 10.0.8 to 10.0.9 by @dependabot[bot] in #1885
• Bump OpenTelemetry and OpenTelemetry.Exporter.Console by @dependabot[bot] in #1891
• Bump Microsoft.Windows.CsWin32 from 0.3.275 to 0.3.287 by @dependabot[bot] in #1889
• Bump Microsoft.Extensions.ObjectPool from 10.0.8 to 10.0.9 by @dependabot[bot] in #1887
• Bump Microsoft.Extensions.TimeProvider.Testing from 10.6.0 to 10.7.0 by @dependabot[bot] in #1888
• fix: Phase 0 verified-bug fixes from refactoring audit by @yuto-trd in #1892
• fix(engine): dispose consumed AudioBuffer in audio graph nodes by @yuto-trd in #1893
• chore: remove tests/KeySplineEditor leftover prototype app by @yuto-trd in #1895
• chore: remove unused PackageReferences and dead PackageVersion pins by @yuto-trd in #1896
• refactor!: remove unused BcTabView/BcTabItem control cluster from Beutl.Controls by @yuto-trd in #1898
• refactor: remove dead observable/endpoint machinery and the no-op startup guard by @yuto-trd in #1899
• refactor!: remove three unused ISample structs by @yuto-trd in #1906
• refactor!: drop dead Beutl.Core/Configuration surface by @yuto-trd in #1901
• refactor!: remove dead FFmpegIpc protocol surface (QueryDefaultCodec, EncodeProgress, Handshake) by @yuto-trd in #1908
• refactor!: remove legacy encoder pipeline and obsolete Page/Layer extensions by @yuto-trd in #1905
• refactor!: collapse cross-type TypeConverter matrices to string-only converters by @yuto-trd in #1907
• refactor!: drop assorted dead Engine surface by @yuto-trd in #1904
• refactor: remove unreachable legacy (non-ring-buffer) ReadVideo path from FFmpegWorker by @yuto-trd in #1900
• refactor!: remove [Obsolete] byte-LUT chain by @yuto-trd in #1902
• fix(encoding): surface encode cancellation as OperationCanceledException by @yuto-trd in #1894
• fix: prevent IpcFrameProvider from returning wrong frame on non-sequential requests by @yuto-trd in #1912
• fix(threading): make _running volatile and cover the Shutdown/Wait race by @yuto-trd in #1911
• docs: multi-agent audit playbook + refactoring-plan Phase 1/3 corrections by @yuto-trd in #1913
• feat: add 'Add Adjustment Layer' menu (refactor ElementDescription to EngineObjectFactory) by @yuto-trd in #1880
• fix(extensibility): compare encoder extensions case-insensitively in IsSupported by @yuto-trd in #1918
• refactor: drop unreachable NotoSansJP UI weights, stale AVF dylibs, and orphan icon by @yuto-trd in #1897
• refactor: remove in-process FFmpeg path, collapse FFmpegOutOfProcess axis, relocate GPL sources by @yuto-trd in #1909
• refactor!: remove dead StringHash and BaseUriHelper helpers by @yuto-trd in #1920
• refactor!: make GainNode.Gain a required non-null property by @yuto-trd in #1921
• fix(engine): dispose child AudioBuffer consumed by SpeedProcessor.Read by @yuto-trd in #1919
• refactor: strip dead null-guards from DelayNode body by @yuto-trd in #1923
• refactor: remove stale InternalsVisibleTo for deleted Beutl.PackageTools CLI by @yuto-trd in #1922
• fix(test): gamma-encode linear HDR pixels to sRGB in Graphics3DTests debug PNGs by @yuto-trd in #1924
• refactor(core): extract fragile legacy type-name literals into LegacyTypeNames constants by @yuto-trd in #1925
• refactor: remove unused ReactiveUI.Avalonia references from WaitingDialog and PackageTools.UI by @yuto-trd in #1927
• fix(worker): respect BEUTL_HOME when locating FFmpeg libraries by @yuto-trd in #1929
• fix(worker): stop prefetch before disposing ReaderState in DecodingHandler.Dispose by @yuto-trd in #1928
• fix: skip keyframe animations with unresolvable parent offset by @yuto-trd in #1926
• refactor(editor): extract keyframe-seek logic to KeyFrameNavigationHelper and add tests by @yuto-trd in #1930
• Bump OpenTelemetry.Exporter.OpenTelemetryProtocol from 1.15.3 to 1.16.0 by @dependabot[bot] in #1915
• Bump Microsoft.Windows.CsWin32 from 0.3.287 to 0.3.296 by @dependabot[bot] in #1914
• Bump System.CommandLine from 2.0.8 to 2.0.9 by @dependabot[bot] in #1917
• feat!: resolution-independent rendering pipeline (003) by @yuto-trd in #1886
• test(editor): cover KeyFrameNavigationHelper NodeGraph member path by @yuto-trd in #1932
• fix(hooks): pin and checksum-verify dotnet-install.sh before executing by @yuto-trd in #1933
• refactor!: remove dead public graphics surface (ICanvas, INode, GraphicsException, FpsText/DrawFps) by @yuto-trd in #1903
• Bump System.Management from 10.0.8 to 10.0.9 by @dependabot[bot] in #1941
• test(rendering): cover FR-036 escape hatch through FilterEffect.Resource.Push by @yuto-trd in #1943
• refactor(ffmpeg-ipc): relocate IPC frame/sample providers to MIT Beutl.FFmpegIpc + add seek/cancel tests by @yuto-trd in #1934
• fix(editor): read onion-skin config on the UI thread in PlayerViewModel.OnSceneEdited by @yuto-trd in #1935
• fix(app): replace window-capture stop busy-spin with a single-flight async gate by @yuto-trd in #1931
• fix!: address 003 resolution-independent rendering review follow-ups by @yuto-trd in #1937
• test: deflake Counter ParallelTryAddRefRace race-window guard by @yuto-trd in #1947
• perf(engine): hoist loop-invariant rowFill out of AudioSpectrogramDrawable cell loop by @yuto-trd in #1939
• perf(ffmpeg): make the three codec property editors async + cached by @yuto-trd in #1936
• feat: Add audio Limiter (brick-wall peak limiter) effect by @yuto-trd in #1725
• perf(player): reuse one snapshot bitmap for onion-skin compositing by @yuto-trd in #1944
• Bump Microsoft.Windows.CsWin32 from 0.3.296 to 0.3.298 by @dependabot[bot] in #1945
• Bump Refit from 10.2.0 to 11.2.0 by @dependabot[bot] in #1946
• chore(deps): bump actions/checkout from 6 to 7 by @dependabot[bot] in #1948
• fix(engine): sanitize degenerate maxWorkingScale on public surface by @yuto-trd in #1942
• fix(player): stop transform-handle overlay from blocking the UI during playback by @yuto-trd in #1949
• refactor!: remove MediaFoundation DXVA2/audio dead paths and no-op settings by @yuto-trd in #1910
• refactor!: remove RenderNodeCache LastAccessedTime by @yuto-trd in #1951
• fix: guard limiter deque overflow in release by @yuto-trd in #1953
• fix(player): dispose CancellationTokenSource in BufferedPlayer.WaitRender/WaitTimer by @yuto-trd in #1950
• fix(audio): dispose output buffer on failure across all audio nodes by @yuto-trd in #1952
• fix(engine): avoid double-dispose in RasterizeAndConcat and RasterizeAt when an op throws on Dispose by @yuto-trd in #1954
• cleanup(player): remove dead DrawFrame() by @yuto-trd in #1959
• build: drop blanket dual-TFM default, hoist MSBuild blocks, unify coverlet (Phase 2) by @yuto-trd in #1955
• fix(engine): guard audio/media sample-index conversions against Int32 overflow by @yuto-trd in #1960
• test: consolidate Beutl.UnitTests scaffolding, modernize assertions, unblock Editor.Components (Phase 2) by @yuto-trd in #1956
• fix: bound dotnet session-start hook operations by @yuto-trd in #1962
• fix(engine): guard waveform thumbnail sample math overflow by @yuto-trd in #1965
• chore: add hook that flags newly added comments for review by @yuto-trd in #1971
• docs: document shader uniform migration by @yuto-trd in #1963
• refactor(editor): extract encoder settings JSON handling by @yuto-trd in #1969
• docs: fix Graphics3D NUnit test routing across guidance docs by @yuto-trd in #1968
• perf(ffmpeg): share FFmpegOptionsCache across editor instances to dedupe worker IPC by @yuto-trd in #1961
• test(nodegraph): cover NodeGraphFilterEffectRenderNode scale forwarding by @yuto-trd in #1967
• refactor: move interactive previewers/sample out of tests/, invert ArtifactProvider opt-in (Phase 2) by @yuto-trd in #1957
• test(engine): cover SpeedIntegrator long-timeline sample index by @yuto-trd in #1980
• fix(mediafoundation): compile sideload timestamp utilities by @yuto-trd in #1972
• fix(engine): preserve rasterize cleanup exceptions by @yuto-trd in #1970
• fix(editor): pause playback before history mutations by @yuto-trd in #1966
• test: make Beutl.Graphics3DTests and SourceGeneratorTest real NUnit suites (Phase 2) by @yuto-trd in #1958
• fix(engine): guard op-dispose loops against leaking remaining ops on throw by @yuto-trd in #1973
• fix(editor): apply latest scene settings after pause by @yuto-trd in #1977
• fix(engine): deterministically dispose FormattedText Skia handles by @yuto-trd in #1974
• fix(ffmpeg): avoid -22 Invalid argument on seek past EOF by @yuto-trd in #1985
• fix(engine): guard video thumbnail count against degenerate frame size by @yuto-trd in #1978
• fix(player): prevent BufferedPlayer timer dispose hang by @yuto-trd in #1981
• Bump Microsoft.NET.Test.Sdk from 18.6.0 to 18.7.0 by @dependabot[bot] in #1986
• fix(mediafoundation): guard frame buffer size overflow by @yuto-trd in #1976
• fix(mediafoundation): dispose MFReader resources on init failure by @yuto-trd in #1964
• fix(api): roll back failed extension loads by @yuto-trd in #1979
• fix(mediafoundation): dispose MFDecoder on init failure by @yuto-trd in #1987
• fix(ci): select x64 debian release asset by @yuto-trd in #1975
• test(rendering): assert LayerRenderNode emits Unbounded EffectiveScale by @yuto-trd in #1989
• test(rendering): cover non-origin DestRect and ImageBrush fill density by @yuto-trd in #1993
• fix(mediafoundation): open video-only files in AudioVideo mode by @yuto-trd in #1991
• docs: Harden branch naming and auto-register follow-ups in AI-review skill by @yuto-trd in #1996
• docs: Forbid deferring tasks instead of capturing follow-ups by @yuto-trd in #2001
• fix(engine): dispose truncated FormattedText glyph resources on shrink by @yuto-trd in #1990
• refactor(ffmpeg): extract codec-editor query/apply decisions for unit tests by @yuto-trd in #1994
• fix(engine): rebuild cached glyph geometry path on FormattedText slot reuse by @yuto-trd in #1995
• perf(ffmpeg-ipc): reuse retained buffer for same-frame re-requests in IpcFrameProvider by @yuto-trd in #1988
• fix(engine): preserve rasterize output and exceptions when RenderTarget disposal throws by @yuto-trd in #1992
• fix(engine): throw ObjectDisposedException from FormattedText measuring members after Dispose by @yuto-trd in #1999
• fix(editor): harden HistoryMutationPlaybackGuard.Dispose and SceneSettings Apply feedback by @yuto-trd in #2002
• build(deps): bump actions/cache from 5 to 6 by @dependabot[bot] in #2003
• fix(ffmpeg-ipc): harden IpcFrameProvider/IpcSampleProvider (leak guard, size validation, prefetch, EOF clamp) by @yuto-trd in #2012
• refactor!: make IFrameProvider/ISampleProvider IDisposable and guard IPC providers post-dispose by @yuto-trd in #2013
• refactor(ffmpeg): extract seek/prefetch decisions as pure predicates + tests by @yuto-trd in #2014
• test(ffmpeg-ipc): fix Windows hang in IpcConnection multiplexed tests (drain outbound request) by @yuto-trd in #2016
• docs: clarify Nuke-only publish for the FFmpeg worker; mark matrix collapse done by @yuto-trd in #2015
• fix(engine): dispose uncommitted scaled text handles in FormattedText.GetScaledTextCache by @yuto-trd in #2000
• refactor!: remove ProjectService/EditorService/ExtensionProvider singletons by @yuto-trd in #1982
• test: introduce headless E2E test suites (domain, controls, shell) by @yuto-trd in #2017
• feat: add /beutl-loop autonomous board loop (loop engineering) by @yuto-trd in #2018

Full Changelog: v2.0.0-preview.3...v2.0.0-preview.4