test(transcribe): the wrapper does not restart a cancelled job; PlanFor of an empty or unknown language is pinned (#61)

Low findings of the PR #62 re-review: the WithTimeout test's comment claimed cancellation
travels on the context but only the language was asserted (the WithoutCancel mutant survived),
and PlanFor('') and PlanFor(unknown) were untested.

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

internal/adapters/transcribe/timeout_test.go

@@ -131,3 +131,16 @@ func TestWithTimeout_TheEngineStillReceivesTheLanguageOfTheJob(t *testing.T) {
 		})
 	}
 }
+
+func TestWithTimeout_ACancelledJobIsNotRestartedByTheWrapper(t *testing.T) {
+	var got seen
+	srv := serve(t, 200, verboseJSON, &got)
+	b := transcribe.WithTimeout(transcribe.NewGateway(srv.URL+"/v1", "k", "iguana/kb-whisper", srv.Client()), time.Minute)
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	_, err := b.Transcribe(ctx, wavFile(t, "RIFF-synthetic-pcm"))
+
+	require.Error(t, err)
+	assert.Empty(t, got.method, "a cancelled job must not send its audio anywhere through the wrapper")
+}