plan: defect 23, a vendor marked no-1099 reads as undecided

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T3gXMVt7XJPi6ens1or9Dj

plan/served.md

@@ -858,6 +858,8 @@ Wanderland keeps working between phases.
 
 **Defect 22, depreciation through an asset's final month** (found in P0 review round 4, 2026-10-17): the depreciation schedule plugs to the full depreciable amount whenever the date it is computed through falls in the asset's final month, even mid-month. A disposed asset's schedule therefore shows full depreciation in its disposal month, and mid-final-month figures are overstated. Resolve from the standard (straight-line, partial months prorated by days, as the rest of the schedule already does), then adjudicate the changed figures in the P3 change log. Related, found in the same round and fixed in P0: the final-month true-up compared the month with chrono's `%Y`, so assets whose life ran past 9999 (or before year 0) never trued up. Assets whose life runs past 9999 also can't post months after 9999-12 (periods are bounded to years 1-9999); decide in P3 whether to refuse such lives at registration. Also noted: the viewer recomputes a very long-life asset's whole schedule every frame (slow; pre-existing).
 
+**Defect 23, a vendor marked "no 1099" looks undecided** (found on the first company's books, 2026-10-18): `books.set_vendor_1099` with `form_1099: "none"` stores and returns `null`, the same as a vendor nobody has decided on, so `books.list_vendors`, the 1099 worksheet and Needs attention can't tell "the owner decided: no 1099" from "never asked". Store the decision as its own value (`none`, with who decided and when), and let Needs attention ask about vendors with no decision. P3 (it changes what the 1099 worksheet says).
+
 **Defect 8, tax categories:** `add_account` warns on P&L accounts without a tax category. Needs attention flags all P&L accounts regardless of activity. `policy.require_tax_category` makes it a refusal.
 
 **Defect 9, schedules:**