feat: migrate from msgpack to protobuf (handler-base v1.0.0)

- Replace msgpack encoding with protobuf wire format
- Update field names to proto convention
- Change Parameters type from map[string]any to map[string]string
- Rewrite tests for proto round-trips

e2e_test.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"encoding/json"
+	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"sync/atomic"
@@ -27,10 +28,10 @@ func TestSubmitArgoE2E_FullPayload(t *testing.T) {
 	defer ts.Close()
 
 	ctx := t.Context()
-	params := map[string]any{
+	params := map[string]string{
 		"source":     "s3://bucket/docs",
 		"collection": "knowledge-base",
-		"batch_size": 100,
+		"batch_size": "100",
 	}
 
 	runID, err := submitArgo(ctx, ts.Client(), ts.URL, "ai-ml", "document-ingestion", params, "req-e2e-001")
@@ -80,9 +81,9 @@ func TestSubmitKubeflowE2E_FullPayload(t *testing.T) {
 	defer ts.Close()
 
 	ctx := t.Context()
-	params := map[string]any{
+	params := map[string]string{
 		"query":   "what is kubernetes",
-		"top_k":   5,
+		"top_k":   "5",
 		"user_id": "test-user",
 	}
 
@@ -131,7 +132,7 @@ func TestPipelineDispatchE2E_UnknownPipeline(t *testing.T) {
 		names = append(names, k)
 	}
 	resp := &messages.PipelineStatus{
-		RequestID:          "req-bad",
+		RequestId:          "req-bad",
 		Status:             "error",
 		Error:              "Unknown pipeline: nonexistent-pipeline",
 		AvailablePipelines: names,
@@ -162,7 +163,7 @@ func TestSubmitArgoE2E_ConcurrentRequests(t *testing.T) {
 	for i := 0; i < 10; i++ {
 		go func() {
 			_, err := submitArgo(ctx, ts.Client(), ts.URL, "ai-ml", "batch-inference",
-				map[string]any{"batch": i}, "req-concurrent")
+				map[string]string{"batch": fmt.Sprintf("%d", i)}, "req-concurrent")
 			errs <- err
 		}()
 	}
@@ -189,7 +190,7 @@ func BenchmarkSubmitArgo(b *testing.B) {
 	defer ts.Close()
 
 	ctx := b.Context()
-	params := map[string]any{"source": "test"}
+	params := map[string]string{"source": "test"}
 
 	b.ResetTimer()
 	for b.Loop() {
@@ -204,7 +205,7 @@ func BenchmarkSubmitKubeflow(b *testing.B) {
 	defer ts.Close()
 
 	ctx := b.Context()
-	params := map[string]any{"query": "test"}
+	params := map[string]string{"query": "test"}
 
 	b.ResetTimer()
 	for b.Loop() {