Make the export bucket pay for itself

Rewrite lifecycle.json so the exports stop growing the bill. Scope every rule to the exports/ prefix so no other data is touched. Keep exports in S3 Standard for the first 30 days, because the dashboards read them directly and must not need a restore. After that, transition them into an archive class, then onward to S3 Glacier Deep Archive - but a single rule cannot move an object on before the class it is leaving has served its minimum storage duration, so work out the earliest legal day for that second transition rather than guessing. Make a deliberate decision about the sub-128 KB manifests with an object-size filter instead of leaving the S3 default to decide silently. Expire current versions on day 2555, the seven-year obligation, and no earlier. Finally, abandon incomplete multipart uploads after a bounded number of days.