added git ssh support and ablity to download repo via zip, tar.gz, and bundle

internal/domain/git/binary.go

@@ -3,6 +3,7 @@ package git
 import (
 	"errors"
 	"fmt"
+	"io"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -467,3 +468,43 @@ func parseUnifiedDiff(raw string) []FileDiff {
 	commit()
 	return files
 }
+
+// ArchiveStream writes a git archive of ref in the requested format to w.
+// format must be one of "zip", "tar.gz", or "bundle".
+// Output is streamed directly to w without buffering.
+func ArchiveStream(repoPath string, ref string, format string, w io.Writer) error {
+	clean := filepath.Clean(repoPath)
+	if repoRoot != "" {
+		root := repoRoot + string(filepath.Separator)
+		if !strings.HasPrefix(clean+string(filepath.Separator), root) && clean != repoRoot {
+			return ErrPathTraversal
+		}
+	}
+
+	baseEnv := []string{"GIT_TERMINAL_PROMPT=0", "HOME=/tmp"}
+
+	var cmd *exec.Cmd
+	switch format {
+	case "zip", "tar.gz":
+		cmd = exec.Command("git", "archive", "--format="+format, ref)
+	case "bundle":
+		cmd = exec.Command("git", "bundle", "create", "-", "--all")
+	default:
+		return fmt.Errorf("git archive: unsupported format %q", format)
+	}
+
+	cmd.Dir = clean
+	cmd.Env = baseEnv
+	cmd.Stdout = w
+
+	var errBuf strings.Builder
+	cmd.Stderr = &errBuf
+
+	if err := cmd.Run(); err != nil {
+		if errBuf.Len() > 0 {
+			return fmt.Errorf("git archive: %w: %s", err, errBuf.String())
+		}
+		return fmt.Errorf("git archive: %w", err)
+	}
+	return nil
+}