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A blank header region means the Dialogys vehicle result never rendered (transient/ slow), NOT a genuine miss — a decodable Renault (Megane) read "" here and was wrongly returned not_found (made definitive by the Rpartstore-down gate). Return ambiguous so the caller's cheap in-session reset retries; a real empty-form miss just exhausts the bounded retries. A NON-empty unparseable header (old R19's garbled parts screen) stays a fast definitive not_found. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>