- Guard MediaOptimizer::fitToCanvas and cropToAspectRatio against huge-dimension sources (getimagesize budget check) so they fail cleanly instead of exhausting GD memory.
- Fit and crop now translate decode/process failures into a clean InstagramPublishException and remove their temp files via finally; the two paths are symmetric.
- publishStory reads the story canvas dimensions via data_get.
- Previews: restore the IG empty-state background, align the autoFitsImage suppression predicate to isImage, drop the explanatory comment, and use single-quote imports.
- Tests: real end-to-end story fit, undecodable/download/container failures, the memory guard (fit and crop), temp-file cleanup, blurred-background pixel assertions, and the aspect-ratio warning suppression.
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