Keep checkpoints aligned with PromptKit profiles

internal/framework/llm/scheduled_client_test.go

@@ -75,6 +75,28 @@ func TestScheduledClientPropagatesSchedulerError(t *testing.T) {
 	}
 }
 
+func TestScheduledClientPreservesCheckpointFingerprints(t *testing.T) {
+	scheduler, err := NewScheduler(1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	inner := &fingerprintedStructuredClient{
+		fingerprints: []CheckpointFingerprint{{Name: "profile_source", Value: "sha256:one"}},
+	}
+	client := NewScheduledClient(inner, scheduler)
+	provider, ok := client.(CheckpointFingerprintProvider)
+	if !ok {
+		t.Fatalf("scheduled client %T does not preserve checkpoint fingerprints", client)
+	}
+	got, err := provider.LLMCheckpointFingerprints()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(got) != 1 || got[0] != inner.fingerprints[0] {
+		t.Fatalf("checkpoint fingerprints = %#v, want %#v", got, inner.fingerprints)
+	}
+}
+
 type blockingStructuredClient struct {
 	release     chan struct{}
 	inFlight    int32
@@ -110,6 +132,15 @@ type errorStructuredClient struct {
 	err error
 }
 
+type fingerprintedStructuredClient struct {
+	errorStructuredClient
+	fingerprints []CheckpointFingerprint
+}
+
+func (c *fingerprintedStructuredClient) LLMCheckpointFingerprints() ([]CheckpointFingerprint, error) {
+	return append([]CheckpointFingerprint(nil), c.fingerprints...), nil
+}
+
 func (c *errorStructuredClient) CompleteStructured(ctx context.Context, req contracts.StructuredCompletionRequest, out any) (contracts.StructuredCompletionResponse, error) {
 	return contracts.StructuredCompletionResponse{}, c.err
 }