add transaction CSV export and category suggestion features

README.md

@@ -126,6 +126,24 @@ print(f"Balance: ${balance / 1000:.2f}")
 
 See `ynab_example.py` for a complete example that also saves all transactions to `ynab_transactions.json`.
 
+### Export YNAB Transactions to CSV
+
+Write transactions from the configured credit and debit accounts for the past 60 days:
+
+```powershell
+python .\main.py --record-transactions
+```
+
+Set a different lookback (1–240 days) and output path:
+
+```powershell
+python .\main.py --record-transactions=90 --transactions-csv .\exports\transactions.csv
+```
+
+The default output is `transactions.csv`. It contains only `payee`, `category`, `inflow`, and `outflow` columns. Split transactions are written as one row per subcategory, keeping the parent transaction's payee on each row. The misspelled `--record-trasactions` option is also accepted as an alias.
+
+When importing bank transactions with `--ynab-import`, the importer uses `transactions.csv` and a reusable `category_memory.json` sidecar to suggest categories from similar payees, transaction direction, and amount. Confident suggestions are sent to YNAB; uncertain ones appear with a `?` in the preview and remain uncategorized. Each explicit `--record-transactions` export merges new patterns into the sidecar, so they remain available after older rows leave the CSV. Keep or sync both files between machines; the sidecar contains normalized payee/category/amount patterns but no transaction dates or IDs.
+
 ### ynab.yml Format
 
 ```yaml