feat: add Robot (ring modulation) and Dźwięk z tostera (8-bit bitcrusher) player audio effects

tests/test_effects.py

@@ -8,6 +8,8 @@ from zyrarbot.audio.effects import (
     DistortionEffect,
     FourthDensityEffect,
     MuffledEffect,
+    RobotEffect,
+    ToasterEffect,
     TremoloEffect,
     create_default_effects,
 )
@@ -47,6 +49,23 @@ class TestAudioEffects(unittest.TestCase):
         out = fx.process(pcm)
         self.assertEqual(len(out), len(pcm))
 
+    def test_robot_modulates_ring(self):
+        fx = RobotEffect(freq_hz=65.0, mix=0.85)
+        pcm = (struct.pack("<hh", 10000, 10000)) * 960
+        out = fx.process(pcm)
+        self.assertEqual(len(out), len(pcm))
+        self.assertNotEqual(out, pcm)
+
+    def test_toaster_bitcrush_pcm(self):
+        fx = ToasterEffect(bit_depth=5, downsample=6)
+        pcm = struct.pack("<hh", 12345, -23456)
+        out = fx.process(pcm)
+        l, r = struct.unpack("<hh", out)
+        # Low 11 bits are zeroed due to 5-bit quantization
+        self.assertEqual(l & 0x07FF, 0)
+        self.assertEqual(r & 0x07FF, 0)
+
+
     def test_pipeline_chains_multiple_effects_and_applies_volume(self):
         pipeline = AudioEffectsPipeline(create_default_effects())
         pcm = (struct.pack("<hh", 1000, -1000)) * 960