[PREVIEW TEST] Digest gearbox shakedown — production delivery check

A controlled launch check for the Vanagon Mailing List. The bus is patient; the digest should be timely. Email distribution stays off until a permanent server-enforced audience for the owner test inbox is registered and verified. This is a service acceptance test, not historical archive content or repair advice. Run-ID: prod-digest-20261110-owner-1

Controlled production digest check for the owner inbox only. The bus has found its gearbox; now we are checking the mailbag. Run-ID: prod-digest-20261110-owner-1