Regenerate all codegen including session events, fix Go DataContent

The codegen check requires all generated files to match. Regenerate
session events alongside RPC types. The Go session events now have
DataContent (union type) for Content field — update all Go consumers
to use .Content.String instead of .Content directly.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: SteveSandersonMS

go/README.md

@@ -58,8 +58,8 @@ func main() {
     done := make(chan bool)
     session.On(func(event copilot.SessionEvent) {
         if event.Type == "assistant.message" {
-            if event.Data.Content != nil {
-                fmt.Println(*event.Data.Content)
+            if event.Data.Content != nil && event.Data.Content.String != nil {
+                fmt.Println(*event.Data.Content.String)
             }
         }
         if event.Type == "session.idle" {
@@ -417,14 +417,14 @@ func main() {
         } else if event.Type == "assistant.message" {
             // Final message - complete content
             fmt.Println("\n--- Final message ---")
-            if event.Data.Content != nil {
-                fmt.Println(*event.Data.Content)
+            if event.Data.Content != nil && event.Data.Content.String != nil {
+                fmt.Println(*event.Data.Content.String)
             }
         } else if event.Type == "assistant.reasoning" {
             // Final reasoning content (if model supports reasoning)
             fmt.Println("--- Reasoning ---")
-            if event.Data.Content != nil {
-                fmt.Println(*event.Data.Content)
+            if event.Data.Content != nil && event.Data.Content.String != nil {
+                fmt.Println(*event.Data.Content.String)
             }
         }
         if event.Type == "session.idle" {

go/generated_session_events.go

@@ -84,7 +84,7 @@ func TestCompaction(t *testing.T) {
 		if err != nil {
 			t.Fatalf("Failed to send verification message: %v", err)
 		}
-		if answer.Data.Content == nil || !strings.Contains(strings.ToLower(*answer.Data.Content), "dragon") {
+		if answer.Data.Content == nil || !strings.Contains(strings.ToLower(*answer.Data.Content.String), "dragon") {
 			t.Errorf("Expected answer to contain 'dragon', got %v", answer.Data.Content)
 		}
 	})

go/internal/e2e/compaction_test.go

@@ -51,7 +51,7 @@ func TestMCPServers(t *testing.T) {
 			t.Fatalf("Failed to get final message: %v", err)
 		}
 
-		if message.Data.Content == nil || !strings.Contains(*message.Data.Content, "4") {
+		if message.Data.Content == nil || !strings.Contains(*message.Data.Content.String, "4") {
 			t.Errorf("Expected message to contain '4', got: %v", message.Data.Content)
 		}
 
@@ -100,7 +100,7 @@ func TestMCPServers(t *testing.T) {
 			t.Fatalf("Failed to send message: %v", err)
 		}
 
-		if message.Data.Content == nil || !strings.Contains(*message.Data.Content, "6") {
+		if message.Data.Content == nil || !strings.Contains(*message.Data.Content.String, "6") {
 			t.Errorf("Expected message to contain '6', got: %v", message.Data.Content)
 		}
 
@@ -146,7 +146,7 @@ func TestMCPServers(t *testing.T) {
 			t.Fatalf("Failed to send message: %v", err)
 		}
 
-		if message.Data.Content == nil || !strings.Contains(*message.Data.Content, "hunter2") {
+		if message.Data.Content == nil || !strings.Contains(*message.Data.Content.String, "hunter2") {
 			t.Errorf("Expected message to contain 'hunter2', got: %v", message.Data.Content)
 		}
 
@@ -231,7 +231,7 @@ func TestCustomAgents(t *testing.T) {
 			t.Fatalf("Failed to get final message: %v", err)
 		}
 
-		if message.Data.Content == nil || !strings.Contains(*message.Data.Content, "10") {
+		if message.Data.Content == nil || !strings.Contains(*message.Data.Content.String, "10") {
 			t.Errorf("Expected message to contain '10', got: %v", message.Data.Content)
 		}
 
@@ -280,7 +280,7 @@ func TestCustomAgents(t *testing.T) {
 			t.Fatalf("Failed to send message: %v", err)
 		}
 
-		if message.Data.Content == nil || !strings.Contains(*message.Data.Content, "12") {
+		if message.Data.Content == nil || !strings.Contains(*message.Data.Content.String, "12") {
 			t.Errorf("Expected message to contain '12', got: %v", message.Data.Content)
 		}
 
@@ -441,7 +441,7 @@ func TestCombinedConfiguration(t *testing.T) {
 			t.Fatalf("Failed to get final message: %v", err)
 		}
 
-		if message.Data.Content == nil || !strings.Contains(*message.Data.Content, "14") {
+		if message.Data.Content == nil || !strings.Contains(*message.Data.Content.String, "14") {
 			t.Errorf("Expected message to contain '14', got: %v", message.Data.Content)
 		}