## Problem
`banking:backfill-ibans` was calling `GET /accounts/{uid}` but the
correct Enable Banking endpoint is `GET /accounts/{uid}/details`. This
caused every account to return 404, and all 404s were counted as
failures making the command exit with failure status.
Additionally, accounts whose sessions have expired or been revoked will
always return 404 — this is expected and should not be treated as an
error.
## Changes
- **`EnableBankingProvider`** — fix endpoint from `/accounts/{uid}` to
`/accounts/{uid}/details`
- **`BackfillAccountIbans`** — catch `RequestException` 404s separately
and count them as `expired/revoked session` skips rather than failures;
command exits successfully when the only issues are expired sessions
- **Tests** — add test for the 404 expired-session path; update output
string assertions
## Expected output after fix
```
Found 5 account(s) with missing IBAN.
IBAN updated for 2 account(s). Skipped (no IBAN in API response): 0. Skipped (expired/revoked session): 3. Failed: 0.
```
The 2 active-session accounts will be backfilled; the 3 from the
expired/revoked connection will be skipped cleanly.
08dfb07a90