Fix Go cookbook recipes to use correct SDK API

All 5 Go recipes and their markdown docs used incorrect API patterns
that don't match the real github.com/github/copilot-sdk/go v0.1.23:

- copilot.NewClient() -> copilot.NewClient(nil) (*ClientOptions param)
- client.Start() -> client.Start(ctx) (context.Context required)
- copilot.SessionConfig -> &copilot.SessionConfig (pointer required)
- session.On(func(event copilot.Event)) -> session.On(func(event copilot.SessionEvent))
- Type assertions -> event.Type string check + *event.Data.Content deref
- session.WaitForIdle() -> session.SendAndWait(ctx, ...) (WaitForIdle doesn't exist)
- copilot.SystemMessage -> copilot.SystemMessageConfig

All 5 recipes verified to compile against SDK v0.1.23.

cookbook/copilot-sdk/go/pr-visualization.md

@@ -39,6 +39,7 @@ package main
 
 import (
     "bufio"
+    "context"
     "flag"
     "fmt"
     "log"
@@ -46,7 +47,7 @@ import (
     "os/exec"
     "regexp"
     "strings"
-    "github.com/github/copilot-sdk/go"
+    copilot "github.com/github/copilot-sdk/go"
 )
 
 // ============================================================================
@@ -94,6 +95,7 @@ func promptForRepo() string {
 // ============================================================================
 
 func main() {
+    ctx := context.Background()
     repoFlag := flag.String("repo", "", "GitHub repository (owner/repo)")
     flag.Parse()
 
@@ -126,18 +128,18 @@ func main() {
     parts := strings.SplitN(repo, "/", 2)
     owner, repoName := parts[0], parts[1]
 
-    // Create Copilot client - no custom tools needed!
-    client := copilot.NewClient(copilot.ClientConfig{LogLevel: "error"})
+    // Create Copilot client
+    client := copilot.NewClient(nil)
 
-    if err := client.Start(); err != nil {
+    if err := client.Start(ctx); err != nil {
         log.Fatal(err)
     }
     defer client.Stop()
 
     cwd, _ := os.Getwd()
-    session, err := client.CreateSession(copilot.SessionConfig{
+    session, err := client.CreateSession(ctx, &copilot.SessionConfig{
         Model: "gpt-5",
-        SystemMessage: copilot.SystemMessage{
+        SystemMessage: &copilot.SystemMessageConfig{
             Content: fmt.Sprintf(`
 <context>
 You are analyzing pull requests for the GitHub repository: %s/%s
@@ -159,12 +161,16 @@ The current working directory is: %s
     defer session.Destroy()
 
     // Set up event handling
-    session.On(func(event copilot.Event) {
-        switch e := event.(type) {
-        case copilot.AssistantMessageEvent:
-            fmt.Printf("\n🤖 %s\n\n", e.Data.Content)
-        case copilot.ToolExecutionStartEvent:
-            fmt.Printf("  ⚙️  %s\n", e.Data.ToolName)
+    session.On(func(event copilot.SessionEvent) {
+        switch event.Type {
+        case "assistant.message":
+            if event.Data.Content != nil {
+                fmt.Printf("\n🤖 %s\n\n", *event.Data.Content)
+            }
+        case "tool.execution_start":
+            if event.Data.ToolName != nil {
+                fmt.Printf("  ⚙️  %s\n", *event.Data.ToolName)
+            }
         }
     })
 
@@ -180,12 +186,10 @@ The current working directory is: %s
       Finally, summarize the PR health - average age, oldest PR, and how many might be considered stale.
     `, owner, repoName)
 
-    if err := session.Send(copilot.MessageOptions{Prompt: prompt}); err != nil {
+    if _, err := session.SendAndWait(ctx, copilot.MessageOptions{Prompt: prompt}); err != nil {
         log.Fatal(err)
     }
 
-    session.WaitForIdle()
-
     // Interactive loop
     fmt.Println("\n💡 Ask follow-up questions or type \"exit\" to quit.\n")
     fmt.Println("Examples:")
@@ -209,11 +213,9 @@ The current working directory is: %s
             break
         }
 
-        if err := session.Send(copilot.MessageOptions{Prompt: input}); err != nil {
+        if _, err := session.SendAndWait(ctx, copilot.MessageOptions{Prompt: input}); err != nil {
             log.Printf("Error: %v", err)
         }
-
-        session.WaitForIdle()
     }
 }
 ```