fix: deduplicate feature names in parseFeatures

--features demo,demo would propagate duplicates into operations args
and JSON output. Now uses a Set to preserve order while filtering dupes.

Author: fernandomg

source/__tests__/nonInteractive.test.ts

@@ -261,6 +261,13 @@ describe('nonInteractive — custom mode execution', () => {
     const output = getLastJsonOutput()
     expect(output.features).toEqual(['demo'])
   })
+
+  it('deduplicates feature names', async () => {
+    await runNonInteractive({ name: 'my_app', mode: 'custom', features: 'demo,demo,subgraph,demo' })
+
+    const output = getLastJsonOutput()
+    expect(output.features).toEqual(['demo', 'subgraph'])
+  })
 })
 
 describe('nonInteractive — error handling during execution', () => {

source/nonInteractive.ts

@@ -34,10 +34,19 @@ function parseFeatures(featuresFlag: string | undefined): FeatureName[] {
     return []
   }
 
+  const seen = new Set<string>()
+
   return featuresFlag
     .split(',')
     .map((f) => f.trim())
-    .filter((f) => f !== '') as FeatureName[]
+    .filter((f) => {
+      if (f === '' || seen.has(f)) {
+        return false
+      }
+
+      seen.add(f)
+      return true
+    }) as FeatureName[]
 }
 
 function validate(flags: {