fix(typedef): resolve pre-existing clippy warnings in test code

- sequential_reader.rs: change test helper write_u32/write_string param from
  &mut Vec<u8> to &mut [u8] (clippy::ptr_arg)
- validation.rs: replace 3.14/2.71 with 3.5/2.5 in test instances to avoid
  clippy::approx_constant (f32::consts::PI approximation)

crates/alknet-typedef/src/sequential_reader.rs

@@ -852,7 +852,7 @@ mod tests {
     const LE: Endian = Endian::Little;
     const BE: Endian = Endian::Big;
 
-    fn write_u32(buf: &mut Vec<u8>, offset: usize, value: u32, endian: Endian) {
+    fn write_u32(buf: &mut [u8], offset: usize, value: u32, endian: Endian) {
         let bytes = match endian {
             Endian::Little => value.to_le_bytes(),
             Endian::Big => value.to_be_bytes(),
@@ -860,7 +860,7 @@ mod tests {
         buf[offset..offset + 4].copy_from_slice(&bytes);
     }
 
-    fn write_string(buf: &mut Vec<u8>, offset: usize, value: &str, endian: Endian) -> usize {
+    fn write_string(buf: &mut [u8], offset: usize, value: &str, endian: Endian) -> usize {
         let bytes = value.as_bytes();
         let total = 4 + bytes.len();
         write_u32(buf, offset, bytes.len() as u32, endian);

crates/alknet-typedef/src/validation.rs

@@ -605,7 +605,7 @@ mod tests {
         let validator = validator_for(&schema);
         let instance = json!({
             "id": 42,
-            "score": 3.14,
+            "score": 3.5,
             "flag": 1,
             "count": 1000
         });
@@ -688,7 +688,7 @@ mod tests {
             "required": ["f32", "f64"]
         });
         let validator = validator_for(&schema);
-        assert!(validator.is_valid(&json!({"f32": 3.14, "f64": 2.71})));
+        assert!(validator.is_valid(&json!({"f32": 3.5, "f64": 2.5})));
         assert!(validator.is_valid(&json!({"f32": 0, "f64": 0})));
         assert!(!validator.is_valid(&json!({"f32": "x", "f64": 0})));
     }