add M4A, FLAC, OGG audio types and IsAudio() extension methods#50
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New file type definitions: - M4A: ftyp box with M4A/M4B brand (audio/mp4) - FLAC: fLaC magic marker (audio/flac) - OGG: OggS capture pattern (audio/ogg) New IsAudio() convenience methods on Stream, byte[], and ReadOnlySpan<byte>, plus async variants, matching the existing IsImage/IsArchive/IsExecutable/IsDocument pattern. Includes test files and 27 new test cases across sync, async, and byte array test suites.
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Summary
audio/mp4), distinguishing MPEG-4 audio from video MP4audio/flac)audio/ogg)IsAudio()/IsAudioAsync()convenience methods onStream,byte[], andReadOnlySpan<byte>, following the existingIsImage/IsArchive/IsExecutable/IsDocumentpattern