Governor-review bounce (PR #7) fixes on issue-1:
1. GE 2% convenience fee rounds DOWN per item: net = sell - floor(0.02*sell) - buy.
Anchor net 16.12 -> 17 (244-4-223); top-8 members table recomputed with
floored tax -> 598,000/4h = 149,500 gp/h (was 138,000); gp_per_hour_low/high
updated. Validator now rejects fractional-tax arithmetic for GE-margin entries.
2. State machine split wait_fill into wait_buy_fill / wait_sell_fill so the full
buy -> buy-fill -> sell -> sell-fill -> collect path is explicit; sell cycle
can no longer loop back into sell without collecting.
3. Economy qualified as the members path (8 slots); F2P path added (3 slots,
F2P-tradeable rows only): Iron bar + Cosmic rune + Silver ore = 227,000/4h
= 56,750 gp/h. Members/F2P flags cross-checked against wiki item pages.
