Two fixes:
1. Image attachment: moved set_post_thumbnail() and Image B post meta
into generate_and_attach_images() so they persist immediately after
each image generates. Previously the caller set them after both images
completed — if the process timed out (common with GPT-5 Image at
~30s/image), the featured image was never attached and Image B was
never attempted.
2. Image prompts: replaced FLUX.1-optimized rewriter system prompt and
90s infomercial style suffix with prompts optimized for Gemini Flash
Image and GPT-5 Image. New style: premium scientific lifestyle
photography with golds/teals color grading. Includes one-time migration
to update stored style suffix.
Also logs when Image B is skipped due to missing source data (previously
silent), helping diagnose why some posts only get one image.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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