PHASE 4 PLANTED STATE — bookstack (driveless, MariaDB 12.3, container bookstack-db)

Deployed by this drill (it was not on the box). Off-site switch turned ON and verified.

Through the app's OWN web interface (login form -> POST /books, session cookie + Laravel _token):
  entities: id=1  type=book
    name (UTF-8 hex): C3817276C3AD7A74C5B172C591206BC3B66E79766573706F6C6320E28094205233353662
                    = "Árvíztűrő könyvespolc — R356b"
    description     : FELHOM-R356B-BOOKSTACK-SENTINEL-2026-08-22
  The name was written from a python file inside the guest and passed to curl with
  --data-urlencode "name@/tmp/bs.name", so it never crossed a shell argument.

  NOTE: this BookStack version has no `books` table — the 2025_09_15 migration
  `drop_old_entity_tables` unified books/chapters/pages into `entities`. 42 tables total.

Directly in the database — the discriminator:
  felhom_r356b_disc: id=1, marker='ORIGINAL-VALUE-A'

FINDABILITY CONTROL: a control row was planted (id=99), FOUND, removed, and then NOT found.
