refactor: clean up dependencies and modernize build assets for improved stability

tests/test_dea_api.py

@@ -5,7 +5,16 @@ import unittest
 from fastapi import HTTPException, UploadFile
 from fastapi.responses import JSONResponse
 
-from dea_api import BodeParams, DesignParams, add_security_headers, calculate_bode, design_filter, filter_csv
+from dea_api import (
+    BodeCompareParams,
+    BodeParams,
+    DesignParams,
+    add_security_headers,
+    calculate_bode,
+    calculate_bode_compare,
+    design_filter,
+    filter_csv,
+)
 
 
 class DeaApiTest(unittest.TestCase):
@@ -65,6 +74,19 @@ class DeaApiTest(unittest.TestCase):
             raise AssertionError("Expected a[0] validation to fail")
 
 
+    def test_bode_compare_reuses_one_frequency_axis(self):
+        body = calculate_bode_compare(
+            BodeCompareParams(
+                ideal=BodeParams(fs=1000, b=[1.0], a=[1.0]),
+                fixed=BodeParams(fs=1000, b=[0.5, 0.5], a=[1.0]),
+            )
+        )
+
+        self.assertEqual(len(body["freq"]), len(body["ideal"]["mag"]))
+        self.assertEqual(len(body["freq"]), len(body["fixed"]["mag"]))
+        self.assertEqual(len(body["ideal"]["phase"]), len(body["fixed"]["phase"]))
+
+
     def test_filter_downsamples_plot_response_for_large_csv(self):
         rows = ["value"] + [str(i) for i in range(6001)]
         upload = UploadFile(