feat(client): integrate LocalBridge transport and 8-directional movement

Wire SimBridge to use LocalBridge for TCP transport in non-test mode:
_process() polls for incoming snapshots and flushes outbound inputs.
Add 4 diagonal movement variants (NE, SE, SW, NW) to InputMapper and
wire mapping, ordered clockwise. Register diagonal input actions in
project.godot.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/scripts/autoloads/input_mapper.gd

@@ -2,7 +2,8 @@ extends Node
 
 # Semantic actions — NO raw key codes cross the bridge
 enum Action {
-	MOVE_NORTH, MOVE_SOUTH, MOVE_EAST, MOVE_WEST,
+	MOVE_NORTH, MOVE_NORTHEAST, MOVE_EAST, MOVE_SOUTHEAST,
+	MOVE_SOUTH, MOVE_SOUTHWEST, MOVE_WEST, MOVE_NORTHWEST,
 	INTERACT, USE_PERCEPTION_MODE, OPEN_MENU, PAUSE
 }
 
@@ -15,12 +16,20 @@ func _unhandled_input(event: InputEvent) -> void:
 	# is_action_pressed handles press detection for all input types (key, gamepad, etc.)
 	if event.is_action_pressed("move_north"):
 		action = Action.MOVE_NORTH
-	elif event.is_action_pressed("move_south"):
-		action = Action.MOVE_SOUTH
+	elif event.is_action_pressed("move_northeast"):
+		action = Action.MOVE_NORTHEAST
 	elif event.is_action_pressed("move_east"):
 		action = Action.MOVE_EAST
+	elif event.is_action_pressed("move_southeast"):
+		action = Action.MOVE_SOUTHEAST
+	elif event.is_action_pressed("move_south"):
+		action = Action.MOVE_SOUTH
+	elif event.is_action_pressed("move_southwest"):
+		action = Action.MOVE_SOUTHWEST
 	elif event.is_action_pressed("move_west"):
 		action = Action.MOVE_WEST
+	elif event.is_action_pressed("move_northwest"):
+		action = Action.MOVE_NORTHWEST
 	elif event.is_action_pressed("interact"):
 		action = Action.INTERACT
 	elif event.is_action_pressed("perception_mode"):