* fix(draw-image): use density 72 for 1024x1024 PNG output
* test(draw-image): assert real PNG dimensions via IHDR decode
* chore(assets): regenerate cover.png at 1024x1024
* docs(handoff): add handoff and ADR for density fix
* docs(handoff): set PR number
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Co-authored-by: opencode-agent <agent@opencode.local>