Open a tax year and work the return

To open a tax year:
1. Overview → year picker (top of page) → choose the year
2. If it's a new year, "Start return"
3. Confirm entity type + filing status
4. The Return tab now shows the worksheet for that year

The Return worksheet:
- Grouped by form (1040, Schedule C, 1065, etc.) and by schedule within
- Each line item shows: prior-year amount, current-year suggested (from accounting books if Accounting is active), current-year entered
- Edit any line — change is logged to the Audit Trail with timestamp, user, prior value, new value

Auto-sync from books:
- If Accounting is active, the relevant categories sync into Schedule C (or 1120/1065 P&L). Re-sync any time — current-year entered fields are preserved if you've edited them.
- Wally tool `tax_summary` returns a year's status (forms ready / in progress / blocked).