I found that one sentence a bit vague so went and created this
"ASCII-ONLY OUTPUT (must pass)
• Use only 7-bit ASCII: A–Z a–z 0–9 and basic punctuation . , ? ! ' " : ; - ( ) / & plus space and newlines.
• Replace all non-ASCII with ASCII equivalents: ’ ‘ “ ” → ' " ; – — → - ; … → ... ; é/ñ/ü → e/n/u ; remove emojis and zero-width/non-breaking spaces.
• Validation: If the output contains any char outside [\x0A\x0D\x20-\x7E], discard and regenerate until clean."
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