refactor(recipe): clean up runner implementation

- Adjust bufio import to blank (likely for side effects or pending use)
- Refine comments for clarity and remove unnecessary ones
- Split regex string to avoid backtick collisions in literals
- Add error handling to patch writing in createUnifiedPatch
- Minor formatting and defer close adjustments

internal/recipe/runner.go

@@ -1,7 +1,7 @@
 package recipe
 
 import (
-	"bufio"
+	_ "bufio"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -31,7 +31,6 @@ func (r *Runner) Run() error {
 
 		titleLower := strings.ToLower(step.Title)
 
-		// Only two special cases the CLI ever needs to handle
 		switch {
 		case strings.Contains(titleLower, "discover") || strings.Contains(titleLower, "find"):
 			files := r.discoverFiles()
@@ -44,7 +43,6 @@ func (r *Runner) Run() error {
 			continue
 
 		default:
-			// Everything else = pure LLM (works for any language)
 			prompt := fmt.Sprintf(`Recipe Overview:
 %s
 
@@ -79,10 +77,10 @@ Execute this step now. Respond ONLY with the expected output format — no expla
 	return nil
 }
 
-// discoverFiles does a real filesystem scan — generic enough for any Go project
+// discoverFiles does a real filesystem scan (used by "Discover files" steps)
 func (r *Runner) discoverFiles() []string {
 	var files []string
-	root := "internal" // matches the recipe default; we can make it parametric later
+	root := "internal"
 
 	_ = filepath.WalkDir(root, func(path string, d os.DirEntry, err error) error {
 		if err != nil || d.IsDir() || !strings.HasSuffix(path, ".go") {
@@ -101,7 +99,7 @@ func (r *Runner) discoverFiles() []string {
 	return files
 }
 
-// handleApplyStep stays exactly as you had it (dry-run patch + confirmation)
+// handleApplyStep (dry-run patch + confirmation)
 func (r *Runner) handleApplyStep(previousResults []string) {
 	if len(previousResults) == 0 {
 		fmt.Println("   ⚠️  No previous results to apply — skipping.")
@@ -126,7 +124,11 @@ func (r *Runner) handleApplyStep(previousResults []string) {
 	fmt.Println("   Review it, then run with dry_run=false to apply.")
 }
 
-var blockRe = regexp.MustCompile(`(?s)^//\s*(.+?\.go)\n```go\n(.*?)\n````)
+// regex split across lines to avoid backtick collision
+var blockRe = regexp.MustCompile(`(?s)^//\s*(.+?\.go)\n` +
+	"```go\n" +
+	`(.*?)\n` +
+	"```")
 
 func extractCodeBlocks(text string) map[string]string {
 	blocks := make(map[string]string)
@@ -144,13 +146,24 @@ func createUnifiedPatch(blocks map[string]string, patchPath string) error {
 	if err != nil {
 		return err
 	}
-	defer f.Close()
+	defer func(f *os.File) {
+		err := f.Close()
+		if err != nil {
+			return
+		}
+	}(f)
 
 	for path, content := range blocks {
-		fmt.Fprintf(f, "--- %s\n+++ %s\n@@ -0,0 +1,%d @@\n", path, path, strings.Count(content, "\n")+1)
+		_, err := fmt.Fprintf(f, "--- %s\n+++ %s\n@@ -0,0 +1,%d @@\n", path, path, strings.Count(content, "\n")+1)
+		if err != nil {
+			return err
+		}
 		for _, line := range strings.Split(content, "\n") {
-			fmt.Fprintf(f, "+%s\n", line)
+			_, err := fmt.Fprintf(f, "+%s\n", line)
+			if err != nil {
+				return err
+			}
 		}
 	}
 	return nil
-}
+}