Fix ESLint errors, bugs, and add gravity export

- Fix missing return in childRegistrationUtils.registerChild()
- Fix assertionUtils: assertNoNaN uses this.assertNoNaN
- Fix logger: nameModule uses this.nameModule
- Fix assetUtils: convert ESM to CommonJS
- Fix childRegistrationUtils_DEPRECATED: desc -> softwareType
- Add gravity export to index.js for rotatingMachine
- Fix ESLint errors across 18 files (no-undef, no-case-declarations,
  no-mixed-spaces-and-tabs, parsing errors)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/measurements/MeasurementContainer.js

@@ -95,7 +95,7 @@ class MeasurementContainer {
     }
 
     
-    this._currentPosition = positionValue.toString().toLowerCase();;
+    this._currentPosition = positionValue.toString().toLowerCase();
     
     return this;
   }
@@ -328,7 +328,7 @@ class MeasurementContainer {
   getLaggedSample(lag = 1,requestedUnit = null ){
     const measurement = this.get();
     if (!measurement) return null;
-    
+
     let sample = measurement.getLaggedSample(lag);
     if (sample === null) return null;
 
@@ -340,7 +340,7 @@ class MeasurementContainer {
     // Convert if needed
     if (measurement.unit && requestedUnit !== measurement.unit) {
       try {
-        const convertedValue = convertModule(value).from(measurement.unit).to(requestedUnit);
+        const convertedValue = convertModule(sample.value).from(measurement.unit).to(requestedUnit);
         //replace old value in sample and return obj
         sample.value = convertedValue ;
         sample.unit = requestedUnit;