feat(game): add persistent bush-wall breakthroughs

docs/PLAYER_UI.md

@@ -56,13 +56,12 @@ a maze boundary, and is recalculated on resize and rotation.
 
 ## Feedback and message rail
 
-The browser stores the direction for each outstanding move request. Only after
-a matching server `blocked` rejection does it shake the already rendered maze
-in the attempted direction for at most 340 ms; it shows no blocked-move text or spike
-notice. A matching `rate_limited` rejection darkens and blurs only the maze for
-at most 520 ms. Each effect has one restartable timer and is cleared on pause,
-result, reset, disconnect, and control reset. Reduced-motion mode uses a static
-maze border cue for blocked movement instead of a shake.
+The browser stores the direction for each outstanding move request. A matching
+server `blocked` rejection may include only that player's approved breakthrough
+stage, which bends the already rendered bush wall for at most 340 ms without
+blocked-move text. Opened-passage bits in an ordinary cell projection render as
+a permanent trampled bush gap. Effects have one restartable timer and clear on
+pause, result, reset, disconnect, and control reset. Reduced motion is static.
 
 All remaining Russian system messages use one `role=status` live message rail
 above the application top bar. One connection-loss message has highest priority