Why a check says "did not run"

Several checks need an external service. Where one is missing, the app reports that the check did not run rather than reporting a pass.

You will see this on:

• Perceptual continuity checks — need a vision model.
• Loudness — measured: false without FFmpeg; the number shown is a structural estimate.
• C2PA manifests — written but marked unsigned without a certificate.
• Image IP fingerprinting — imageChecked: false without a rights database. The text check still runs.
• CSAM screening — this one throws rather than returning a clean result, and correctly blocks public launch.

This is deliberate and consistent. A green check that never looked is worse than a missing check, because you act on it.

/admin/readiness lists all of these live against your configuration.