chore(scripts): smoke.sh exercises /api/generate/dialog as well

scripts/smoke.sh

@@ -30,3 +30,33 @@ if [ "$HEAD" != "52494646" ]; then
     exit 1
 fi
 echo "OK — wrote $TMP ($(wc -c <"$TMP") bytes)"
+
+echo
+echo "== generate dialog (2 speakers, en)"
+# Make a tiny silent reference clip (1s mono 24k WAV) for both speakers.
+REF_A=$(mktemp -t smoke_a.XXXXXX.wav)
+REF_B=$(mktemp -t smoke_b.XXXXXX.wav)
+python - <<'PY' "$REF_A"
+import sys, numpy as np, soundfile as sf
+sf.write(sys.argv[1], np.zeros(24000, dtype="float32"), 24000, format="WAV", subtype="PCM_16")
+PY
+python - <<'PY' "$REF_B"
+import sys, numpy as np, soundfile as sf
+sf.write(sys.argv[1], np.zeros(24000, dtype="float32"), 24000, format="WAV", subtype="PCM_16")
+PY
+
+OUT=$(mktemp -t smoke_dialog.XXXXXX.wav)
+curl -fsS -X POST "$BASE/api/generate/dialog" \
+    -F text='SPEAKER A: hi.
+SPEAKER B: hello.' \
+    -F engine_id=chatterbox-en \
+    -F params='{}' \
+    -F reference_wav_a=@"$REF_A" \
+    -F reference_wav_b=@"$REF_B" \
+    -o "$OUT"
+HEAD=$(head -c 4 "$OUT" | xxd -p)
+if [ "$HEAD" != "52494646" ]; then
+    echo "FAIL: dialog output is not a RIFF wav (head=$HEAD)"
+    exit 1
+fi
+echo "OK — wrote $OUT ($(wc -c <"$OUT") bytes)"