comments for signal implmentation

src/Mite.js

@@ -1,14 +1,27 @@
-// Signal implementation
+/**
+ * Signal
+ *
+ * Creates a signal for reactive state management
+ *
+ * @param {any} value - Initial value for the signal
+ *
+ * @returns {Object} Signal object with getter, setter, and subscription methods
+ */
 function signal(value) {
     const subscribers = new Set();
     return {
+        // gets current signal value
         get value() {
             return value;
         },
+
+        // sets a new value for the signal, notifying all subscribers
         set value(newValue) {
             value = newValue;
             subscribers.forEach(fn => fn());
         },
+
+        // subscribe to value changes
         subscribe(fn) {
             subscribers.add(fn);
             return () => subscribers.delete(fn);