feat(maze): shrink map and rebalance compact gameplay

MVP.md

@@ -59,7 +59,7 @@ approximately five minutes. There is no match time limit.
 
 ### Dimensions and representation
 
-- The initial configuration is `width = 128`, `height = 64`, or 8,192 cells.
+- The initial configuration is `width = 32`, `height = 32`, or 1,024 cells.
 - Width and height are runtime configuration values and must not be hard-coded
   into game logic.
 - Movement is orthogonal between cells; diagonal movement does not exist.
@@ -274,7 +274,7 @@ board:
    refresh, enter the lobby, and start through the owner-controlled countdown.
 4. Four additional browsers can observe the complete match simultaneously
    without receiving control authority.
-5. Repeatedly generated `128 x 64` maps are connected, centrally symmetric,
+5. Repeatedly generated `32 x 32` maps are connected, centrally symmetric,
    contain cycles and multiple cross-half passages, and preserve equal
    player-relative placement metrics.
 6. Player clients never receive cells or dynamic objects outside their current