feat: roulette bets street, corner, split, etc.

1 files changed, 13 insertions, 4 deletions

diff --git a/building_guide/roulette.md b/building_guide/roulette.md
index 0007625..2d3fc53 100644
--- a/building_guide/roulette.md
+++ b/building_guide/roulette.md
@@ -32,7 +32,9 @@ mode and Unicode preference stay per player (the engine snapshot never embeds
 ANSI). Three views share one renderer:
 
 - **Betting board**: numbered grid with zeros in the left lane, red/black
-  pockets, and outside bets. Green background is reserved for the 0/00 cells.
+  pockets, and outside bets. The whole five-row zero lane (three numbered rows
+  plus the two separators between them) carries the green background, and its
+  outer corners are rounded in Unicode mode.
 - **Spinning**: a stylised 17x9 wheel (wider than tall so it reads as a circle
   in a terminal cell grid). Only the rim is colored, as solid red and black
   pockets alternating around the circumference; pockets are two cells wide
@@ -53,9 +55,16 @@ overview is kept short (`Label | Limits 1-10000 | n/m seated | state`) so it
 fits beside a look minimap; `writeLookSideBySide` also wraps any content line
 that would otherwise run into the map column.
 
-Initial scope is **one wager per player per spin**, covering straight-up and
-outside bets (colors, parity, high/low, 1to12/13to24/25to36, rows). Multiple simultaneous
-bets and split/street/corner bets are future work, not silently accepted syntax.
+Initial scope is **one wager per player per spin**. A wager covers straight-up
+numbers, outside bets (colors, parity, high/low, 1to12/13to24/25to36, rows),
+and the combination bets: splits, streets, corners, six-lines, trios, and the
+basket. Combination targets are a compact number list (`split 1 2`,
+`street 1-2-3`, `corner 1 2 4 5`, `line 1 2 3 4 5 6`, `trio 0 00 2`,
+`basket`) joined from the tokens after `on`; the leading name is optional
+because the geometry of the covered set identifies the bet. Non-adjacent or
+wrong-shaped sets are rejected rather than silently accepted. Multiple
+simultaneous wagers remain future work: `Participant.Wager` still holds a
+single stake.
 All returns are checked before debiting a wager. Both winning and losing stakes
 settle through `PayCredits(return, stakeID)`, including a zero return for losses.
 Failures leave the stake pending and do not claim that payment succeeded.