feat(*): Add sudden-death overtime with golden goal on a draw

Game/scripts/HUDController.gd

@@ -86,6 +86,9 @@ func _initialize_hud():
 	if game_manager and game_manager.has_signal("kickoff_countdown"):
 		game_manager.kickoff_countdown.connect(_on_kickoff_countdown)
 
+	if game_manager and game_manager.has_signal("overtime_started"):
+		game_manager.overtime_started.connect(_on_overtime_started)
+
 func _connect_ship_signals():
 	# Route ship telemetry to the flight instruments
 	if ship.has_signal("speed_changed"):
@@ -154,6 +157,11 @@ func _flash_score_label(label: Label) -> void:
 	tween.tween_property(label, "scale", Vector2(1.4, 1.4), 0.1)
 	tween.tween_property(label, "scale", Vector2(1.0, 1.0), 0.2)
 
+func _on_overtime_started():
+	if timer_label and is_instance_valid(timer_label):
+		timer_label.text = "OT"
+		timer_label.add_theme_color_override("font_color", Color(1.0, 0.85, 0.2))
+
 func _on_kickoff_countdown(count: int):
 	if not kickoff_label or not is_instance_valid(kickoff_label):
 		return

Game/scripts/match_mode.gd

@@ -7,10 +7,12 @@ extends GameMode
 
 signal timer_updated(minutes: int, seconds: int)
 signal score_changed(score: Dictionary)
-# winning_team is -1 for a draw.
+# winning_team is -1 for a draw. Never -1 when reached via overtime.
 signal match_ended(winning_team: int, score: Dictionary)
 # Counts 3, 2, 1, then 0 ("go", hide the label).
 signal kickoff_countdown(count: int)
+# Full time ended level: sudden-death golden goal, no clock.
+signal overtime_started
 
 # How long the result overlay stays up before returning to the menu.
 const RESULT_SCREEN_SECONDS := 5.0
@@ -27,6 +29,7 @@ const KICKOFF_COUNTDOWN_SECONDS := 3
 
 var score := {0: 0, 1: 0}
 var match_timer: Timer
+var _in_overtime := false
 
 
 func _start() -> void:
@@ -71,6 +74,10 @@ func _on_goal_scored(conceding_team: int) -> void:
 	score[scoring_team] += 1
 	score_changed.emit(score.duplicate())
 	print("Goal for team %d! Score: %d - %d" % [scoring_team, score[0], score[1]])
+	if _in_overtime:
+		# Golden goal: the first score after a draw ends the match outright.
+		_end_match(scoring_team)
+		return
 	await _run_kickoff_countdown()
 
 
@@ -102,10 +109,23 @@ func _set_frozen(frozen: bool) -> void:
 
 
 func _on_match_timer_timeout() -> void:
-	print("Full time! Final score: %d - %d" % [score[0], score[1]])
-	var winning_team := -1
-	if score[0] != score[1]:
-		winning_team = 0 if score[0] > score[1] else 1
+	print("Full time! Score: %d - %d" % [score[0], score[1]])
+	if score[0] == score[1]:
+		await _start_overtime()
+		return
+	_end_match(0 if score[0] > score[1] else 1)
+
+
+# Full time ended level: sudden-death golden goal, no clock running.
+# _on_goal_scored checks _in_overtime and ends the match on the next goal.
+func _start_overtime() -> void:
+	_in_overtime = true
+	overtime_started.emit()
+	await _run_kickoff_countdown()
+
+
+func _end_match(winning_team: int) -> void:
+	print("Match over! Final score: %d - %d" % [score[0], score[1]])
 	match_ended.emit(winning_team, score.duplicate())
 	# Freeze gameplay while the HUD (process_mode ALWAYS) shows the result.
 	get_tree().paused = true