Confirm on a real client that the bank window keeps items across a relog #137

Expected (1.12.1). A banker activates the bank window, all 24 base bank slots are usable, an item deposited stays in its slot across a relog, and a purchased bank bag slot appears without one.

Actual (at 87109e3c, harness pin v0.1.0-alpha.13). The code is done. A Headless Client bank adapter walks activate, deposit, relog, withdraw, and the first bank-slot purchase end to end (wire-harness PR #9, core PR #453, which pinned alpha.7). Protocol tests, offline adapter checks, and CI all passed; no existing Realm was used to build or test it. Both blocking tickets (#134 right-click deposit/withdraw, #136 the bank-bag purchase path) are closed. Nobody has opened the stock 1.12.1 client against a running realm to confirm the window itself.

How it shows. Nothing is broken. This is the one check that proves the bytes the adapter verified actually render as a working bank window, cells, and purchased slot on a real client.

How to check. On a local development Realm, activate a banker, deposit an item, log out and back in, withdraw it, and buy a bank bag slot. Confirm the window opens, all 24 cells are usable, the deposited item is in the right cell after the relog, and the purchased slot appears without a relog.

Done when. The result is recorded here, with the client build and the commit, and this issue closes.