style: apply rustfmt across all crates and demos

Consistent formatting pass: line wrapping, import sorting, trailing
whitespace removal, let-chain indentation, merged derive attributes,
and unsafe block reformatting.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

crates/specialized/rtx-neuro-signal/src/ica.rs

@@ -15,8 +15,7 @@
 use crate::{SignalError, SignalResult};
 
 /// ICA estimation method
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[derive(Default)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
 pub enum IcaMethod {
     /// FastICA with logcosh nonlinearity
     #[default]
@@ -27,7 +26,6 @@ pub enum IcaMethod {
     FastIcaCube,
 }
 
-
 /// ICA decomposition result
 #[derive(Debug, Clone)]
 pub struct Ica {