Revert "Harden historical sorter header parsing"

This reverts commit edcad4560c.

restart_prompt.md

@@ -85,7 +85,6 @@ Historical sorting:
 - Account selection is explicit with `--account <naam>`, for example `--account backup`.
 - `--audit` is available in dry-run mode.
 - It logs to `verplaats_log.json`, retries IMAP aborts where implemented, and parses FETCH responses defensively.
-- Header parsing now guards against non-bytes FETCH payloads in both step 2 and step 3 so a malformed/odd IMAP response is logged as a failed header fetch instead of aborting the whole run.
 
 Folder creation:
 
@@ -229,8 +228,6 @@ Totaal gepland: 0 | Totaal geen match: 2218 | Totaal overgeslagen: 8219 | Totaal
 
 Treat that as a successful backup historical-sorter run with no immediate recovery work needed.
 
-A later local `verplaats_bestaand.log` in the workspace is not a `hans` audit. It shows a real `backup` execution (`LET OP`, `Account: backup`) that aborted at `INBOX.Bestellingen.PostNL` with `AttributeError: 'int' object has no attribute 'decode'`. The visible partial counters before the crash were 74 folder summaries, 5,921 planned, 5,920 moved, 3,105 no match, 1,765 skipped, and 1 error. Do not treat this log as approval to run the real `hans` mailbox move.
-
 ## Verification Commands
 
 Latest local verification included:
@@ -244,7 +241,6 @@ git diff --check
 ```
 
 After the plain-mode stop wrapper change, `bash -n deploy_vps.sh` was rerun successfully.
-After the historical-sorter header guard change, `python3 -m py_compile verplaats_bestaand.py` was rerun successfully.
 
 Useful routing sanity check: