steward: the vault stays true or it stops mattering

Humans abandon wikis because maintenance grows faster than value. Here the AI does the maintenance, under two disciplines that decide everything: pages get REWRITTEN to current truth, never appended into sediment, and something must regularly DELETE, or the vault becomes a junk drawer recall can't trust.

  raw/inbox/  ──>  [ CAPTURE ]  discuss -> fold -> reconcile -> tag -> index
                        |
   wiki/      <──  rewritten pages, one truth per topic
                        |
  weekly      ──>  [ HEALTH-CHECK ]  contradictions, stale, orphans, graveyard
                        |
                   a short proposed diff, founder approves, then it happens