Discovery-channel cohort

Each branch advertises a target through one channel. None of the targets is in the sitemap or IndexNow submission.

• Ordinary HTML controlA normal followable anchor.
• nofollow targetAn HTML anchor carrying rel=nofollow.
• JavaScript sourceIts target anchor is created at runtime.
• JSON-LD sourceIts target appears as structured data, not an anchor.
• HTTP Link sourceIts target appears only in the response Link header.
• noscript sourceIts target anchor is inside a noscript fallback.

Measurement marker: ARN-DISC-HUB