295510a5

By: Michael Lynch <git@mtlynch.io>

Test convert orchestration without invoking ffmpeg

The AVIF tests shelled out to a real ffmpeg binary, which is slow,
environment-dependent, and silently skipped when ffmpeg was absent. They
also only verified ffmpeg's own encoding output rather than logic this
repo owns.

Export WriteConvertedFile and AnimatedAVIFFmpegArgs (mirroring the
already-exported VideoFileToWebM) so external tests can exercise the real
orchestration with a fake convert func: stream-vs-file source path,
source-file preservation, destination temp lifecycle, and error
propagation. A pure-function test asserts the ffmpeg arg list. No test
invokes a real encoder.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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