isokit: project layer, Studio GUI, MCP server, viewer, CLI, demo project and docs

crates/isokit-core/src/fmt.rs

@@ -16,7 +16,7 @@ pub fn r1(out: &mut String, v: f64) {
     }
     let a = t.unsigned_abs();
     let _ = write!(out, "{}", a / 10);
-    if a % 10 != 0 {
+    if !a.is_multiple_of(10) {
         let _ = write!(out, ".{}", a % 10);
     }
 }
@@ -65,7 +65,7 @@ pub fn thousands(n: f64) -> String {
     let s = v.unsigned_abs().to_string();
     let mut o = String::new();
     for (i, ch) in s.chars().enumerate() {
-        if i > 0 && (s.len() - i) % 3 == 0 {
+        if i > 0 && (s.len() - i).is_multiple_of(3) {
             o.push(',');
         }
         o.push(ch);