feat: extract PR rendering to String() method using text/template

Co-authored-by: aider (openai/qwen3-coder:30b-a3b-q4_K_M) <aider@aider.chat>

cmd/acb/summarize.go

@@ -165,8 +165,7 @@ func buildPrompt(employeename string, prs map[string][]contributions.PullRequest
 	for repo, prList := range prs {
 		fullPrompt += fmt.Sprintf("Repository: %s\n", repo)
 		for _, pr := range prList {
-			fullPrompt += fmt.Sprintf("- Title: %s\n", pr.Title)
+			fullPrompt += pr.String()
-			fullPrompt += fmt.Sprintf("  Body: %s\n", pr.Body)
 		}
 	}
 	fullPrompt += "Issues:\n"

contributions/gh.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"os"
 	"strings"
+	"text/template"
 )
 
 var ghc = http.Client{}
@@ -32,6 +33,21 @@ type PullRequest struct {
 	URL      string
 }
 
+// String returns a formatted string representation of the PullRequest
+func (pr PullRequest) String() string {
+	tmpl := template.Must(template.New("pr").Parse(`- Title: {{.Title}}
+  Body: {{.Body}}
+`))
+	
+	var buf bytes.Buffer
+	err := tmpl.Execute(&buf, pr)
+	if err != nil {
+		return "" // Return empty string on error
+	}
+	
+	return buf.String()
+}
+
 func GetPRs(org, username string, from string, to string) (map[string][]PullRequest, error) {
 	req, err := http.NewRequest(
 		http.MethodGet,