Rename user-facing e2e "ATM withdraw" to "Bank withdraw". The ladder
amounts (20/50/100/200/…) were labeled ATM because they match typical
CHF cash-note sizes (Bankomat), not because anything hits a physical ATM.
Keep E2E_ATM_MAX as alias of E2E_BANK_WITHDRAW_MAX; keep e2e.atm-* group ids.
devtesting runs a log-spaced amount ladder up to CHF:50000 after the
baseline plumbing probe. Each rung uses geniban debit funding. Defaults
DEVTESTING_LADDER=1 STEPS=23 MAX=50000; stage RUN_TIMEOUT example 1800s.
