4885d483

Remove convert orchestration test and re-unexport writeConvertedFile

The fake-converter orchestration tests in media_test.go did not justify
exporting writeConvertedFile into the package's public API. Remove the
test and restore writeConvertedFile to unexported, leaving the convert
package's production code unchanged from before.

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

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