feat(transcribe): a non-Swedish upload skips the Swedish-only base engine and is not reconciled (#61)

The other engine transcribes alone, then the cloud fallback if it fails and the job is
still live. A cancelled job never reaches the fallback (mutation-checked).

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/adapters/transcribe/ensemble_test.go

@@ -204,3 +204,52 @@ func TestEnsemble_AShutdownDuringTheSecondEngineIsAnErrorNotASingleEngineSuccess
 	assert.ErrorIs(t, err, context.Canceled, "a cancelled job must not be recorded as 'kb-whisper failed'")
 	assert.Empty(t, got.Text)
 }
+
+// The base engine is Swedish-only. A recording that is not Swedish must never reach it, and
+// there is no second opinion to reconcile: the other engine transcribes alone (tapir#61).
+
+func autoCtx() context.Context { return domain.WithLanguage(context.Background(), domain.LangAuto) }
+
+func TestEnsemble_AnAutoLanguageUploadNeverReachesTheBaseEngineAndIsNotReconciled(t *testing.T) {
+	adj := &verdictAdj{v: reconcile.VerdictAlt}
+	r := newEnsemble("base text", "alt text", nil, nil, true, adj)
+
+	got, err := r.e.Transcribe(autoCtx(), "/a.wav")
+
+	require.NoError(t, err)
+	assert.Equal(t, []string{"iguana/kb-whisper"}, *r.calls, "only the other engine is called")
+	assert.Zero(t, adj.calls, "nothing is adjudicated")
+	assert.Equal(t, "alt text", got.Text)
+	assert.Equal(t, "iguana/kb-whisper", got.Endpoint)
+	assert.Nil(t, got.Reconciliation, "reconciliation does not apply, so none is recorded")
+}
+
+func TestEnsemble_AnAutoLanguageUploadFallsBackWhenItsEngineFailsAndStillSkipsTheBaseEngine(t *testing.T) {
+	r := newEnsemble("base text", "alt text", nil, errors.New("engine down"), true, &verdictAdj{})
+
+	got, err := r.e.Transcribe(autoCtx(), "/a.wav")
+
+	require.NoError(t, err)
+	assert.Equal(t, []string{"iguana/kb-whisper", "berget/kb-whisper"}, *r.calls)
+	assert.Equal(t, "berget/kb-whisper", got.Endpoint)
+}
+
+func TestEnsemble_AnAutoLanguageUploadWithNoFallbackFailsWithoutTouchingTheBaseEngine(t *testing.T) {
+	r := newEnsemble("base text", "alt text", nil, errors.New("engine down"), false, &verdictAdj{})
+
+	_, err := r.e.Transcribe(autoCtx(), "/a.wav")
+
+	require.Error(t, err)
+	assert.Equal(t, []string{"iguana/kb-whisper"}, *r.calls)
+}
+
+func TestEnsemble_ACancelledAutoLanguageJobDoesNotReachTheFallback(t *testing.T) {
+	r := newEnsemble("base text", "alt text", nil, errors.New("engine down"), true, &verdictAdj{})
+	ctx, cancel := context.WithCancel(autoCtx())
+	cancel()
+
+	_, err := r.e.Transcribe(ctx, "/a.wav")
+
+	require.Error(t, err)
+	assert.NotContains(t, *r.calls, "berget/kb-whisper", "a stopped job must not ship its audio to a cloud endpoint")
+}