Bug fixes: createCompletedURLs nil defer panic fixed. New cache deception patterns (18): .mjs, .ts, .avif, .bmp, .mp4, .pdf, .xml, .zip, double extension, fragment, null byte variants. New unkeyed header tests (12): True-Client-IP, X-Real-IP, X-Forwarded-For, Accept-Language, CF-Connecting-IP, CF-IPCountry, CF-Visitor, CloudFront-Forwarded-Proto, CloudFront-Is-Desktop-Viewer, CloudFront-Is-Mobile-Viewer, CloudFront-Viewer-Country. Module path updated to Spondon16/wcvs.