Implement production vertical slice foundation

game/domain/dive/dive_telemetry_sample.gd

@@ -0,0 +1,38 @@
+class_name DiveTelemetrySample
+extends RefCounted
+
+var depth_m: float
+var longitudinal_effort: float
+var steering_effort: float
+var vertical_effort: float
+var high_thrust_active: bool
+
+
+func _init(
+	p_depth_m: float = 0.0,
+	p_longitudinal_effort: float = 0.0,
+	p_steering_effort: float = 0.0,
+	p_vertical_effort: float = 0.0,
+	p_high_thrust_active: bool = false
+) -> void:
+	depth_m = p_depth_m
+	longitudinal_effort = p_longitudinal_effort
+	steering_effort = p_steering_effort
+	vertical_effort = p_vertical_effort
+	high_thrust_active = p_high_thrust_active
+
+
+func validation_error() -> String:
+	if not is_finite(depth_m) or depth_m < 0.0:
+		return "telemetry depth must be finite and non-negative"
+	if not _is_normalized(longitudinal_effort):
+		return "longitudinal effort must be between -1 and 1"
+	if not _is_normalized(steering_effort):
+		return "steering effort must be between -1 and 1"
+	if not _is_normalized(vertical_effort):
+		return "vertical effort must be between -1 and 1"
+	return ""
+
+
+func _is_normalized(value: float) -> bool:
+	return is_finite(value) and value >= -1.0 and value <= 1.0