chore: apply rustfmt to binding/core sources and sync Cargo.lock

Normalises whitespace in sources committed earlier in this branch
before rustfmt was run over them (Node/WASM bindings, and three core
indicator test modules), and records the wasm-bindgen-test dependency
tree added in B6 into Cargo.lock. No functional change; cargo fmt --all
--check is now clean.

crates/wickra-core/src/indicators/bollinger.rs

@@ -251,6 +251,10 @@ mod tests {
         assert_eq!(bb.update(f64::INFINITY).unwrap(), last);
         // The window still holds 1..=5, so a real input slides it to 2..=6.
         let after = bb.update(6.0).unwrap();
-        assert_relative_eq!(after.middle, (2.0 + 3.0 + 4.0 + 5.0 + 6.0) / 5.0, epsilon = 1e-12);
+        assert_relative_eq!(
+            after.middle,
+            (2.0 + 3.0 + 4.0 + 5.0 + 6.0) / 5.0,
+            epsilon = 1e-12
+        );
     }
 }

crates/wickra-core/src/indicators/keltner.rs

@@ -205,7 +205,10 @@ mod tests {
                     assert_relative_eq!(o.upper, m + 2.0 * av, epsilon = 1e-9);
                     assert_relative_eq!(o.lower, m - 2.0 * av, epsilon = 1e-9);
                 }
-                _ => assert!(got.is_none(), "Keltner must be None until both ready (i={i})"),
+                _ => assert!(
+                    got.is_none(),
+                    "Keltner must be None until both ready (i={i})"
+                ),
             }
         }
     }

crates/wickra-core/src/indicators/mfi.rs

@@ -180,7 +180,10 @@ mod tests {
         for (i, v) in out.iter().enumerate().take(5) {
             assert!(v.is_none(), "candle index {i} must be None during warmup");
         }
-        assert!(out[5].is_some(), "first MFI value lands at index period (5)");
+        assert!(
+            out[5].is_some(),
+            "first MFI value lands at index period (5)"
+        );
         assert_eq!(mfi.warmup_period(), 6);
     }