Add explicit sorter account flag

The prompts used to arrive at this change since the previous commit

For what account is this working?
Add the account name flag

Any special observations that may be relevant for version management for this version. Be brief.

config.py already supported --account globally; verplaats_bestaand.py now documents, validates, and displays the selected account explicitly.

restart_prompt.md

@@ -76,6 +76,7 @@ Scripts using shared IMAP folder handling:
 `verplaats_bestaand.py` current behavior:
 
 - Default mode is dry-run; real moves require `--uitvoeren` and an interactive `JA` confirmation.
+- Account selection is explicit with `--account <naam>`; use `--account backup` for the disposable backup mailbox. The script prints both the config account name and mailbox address before connecting.
 - `--audit` is available only in dry-run mode. It suppresses per-message dry-run lines and prints planned move counts grouped by source folder and destination folder for step 2 and step 3.
 - IMAP `LIST`, `SELECT`, `UID SEARCH`, and `UID FETCH` aborts are logged and retried once after reconnecting. If reconnect also fails, the script records an `ABORT`/`ERROR` in `verplaats_log.json` instead of printing a Python traceback.
 - `MAP_RENAMES` is intentionally empty.
@@ -192,7 +193,7 @@ Latest live mailbox verification:
 
 Recommended next work:
 
-1. Ask the user to run a non-destructive dry-run sorter audit on `backup@australius.nl`, for example `python3 verplaats_bestaand.py --audit` with config pointed at the backup account, then review planned moves by source and destination.
+1. Ask the user to run a non-destructive dry-run sorter audit on `backup@australius.nl`: `python3 verplaats_bestaand.py --account backup --audit`, then review planned moves by source and destination.
 2. Review the audit output for suspicious high-volume destinations, missing matches, and unexpected `Afmelden.*` or invoice routes before approving any actual sorting.
 3. Add shared operation helpers where useful:
    - UID fetch wrappers.

verplaats_bestaand.py

@@ -13,7 +13,8 @@ Stap 2 – Per-bericht routing:
 Stap 3 – Facturen per kwartaal sorteren (Facturen - te verwerken).
 
 Standaard: DRY RUN (laat zien wat er zou gebeuren, verplaatst niets).
-Echt uitvoeren: python3 verplaats_bestaand.py --uitvoeren
+Account kiezen: python3 verplaats_bestaand.py --account backup --audit
+Echt uitvoeren: python3 verplaats_bestaand.py --account backup --uitvoeren
 
 Log: verplaats_log.json
 """
@@ -526,6 +527,19 @@ def load_log() -> dict:
     return {}
 
 
+def account_name_from_args() -> str | None:
+    args = sys.argv[1:]
+    if "--account" not in args:
+        return None
+
+    idx = args.index("--account")
+    if idx + 1 >= len(args) or args[idx + 1].startswith("--"):
+        print("Gebruik: python3 verplaats_bestaand.py --account <naam> [--audit|--uitvoeren]")
+        sys.exit(1)
+
+    return args[idx + 1]
+
+
 # ── main ──────────────────────────────────────────────────────────────────────
 
 def run():
@@ -545,8 +559,9 @@ def run():
             print("Afgebroken.")
             sys.exit(0)
 
-    cfg = config.load()
-    print(f"Account: {cfg.username}\n")
+    account_name = account_name_from_args()
+    cfg = config.load(account_name)
+    print(f"Account: {cfg.name} ({cfg.username})\n")
 
     print(f"Verbinden met {cfg.imap_host}:{cfg.imap_port} ...")
     session = ImapSession(cfg)