feat(audio): aset suara final Kenney CC0 menggantikan placeholder (T-0.6)

internal/audio/assets/kenney-license.txt

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+	
+
+	Interface Sounds (1.0)
+
+	Created/distributed by Kenney (www.kenney.nl)
+	Creation date: 11-02-2020
+
+			------------------------------
+
+	License: (Creative Commons Zero, CC0)
+	http://creativecommons.org/publicdomain/zero/1.0/
+
+	This content is free to use in personal, educational and commercial projects.␍
+	Support us by crediting Kenney or www.kenney.nl (this is not mandatory)
+
+			------------------------------
+
+	Donate:   http://support.kenney.nl
+	Patreon:  http://patreon.com/kenney/
+
+	Follow on Twitter for updates:
+	http://twitter.com/KenneyNL

internal/audio/sounds_test.go

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+package audio
+
+import "testing"
+
+// TestLoadSounds memastikan seluruh aset embedded valid: WAV mono/16-bit/44100
+// dan PCM tidak kosong. Gagal di sini = aset ketimpa atau berubah format.
+func TestLoadSounds(t *testing.T) {
+	sounds, err := loadSounds()
+	if err != nil {
+		t.Fatalf("loadSounds: %v", err)
+	}
+	if len(sounds) != len(allEvents) {
+		t.Fatalf("jumlah suara termuat: %d, harusnya %d", len(sounds), len(allEvents))
+	}
+	for _, ev := range allEvents {
+		if len(sounds[ev]) == 0 {
+			t.Errorf("%s: PCM kosong", ev)
+		}
+	}
+}