Release 1.4.0: macOS CLI builds and multi-platform update channel.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/update/update_darwin.go

@@ -0,0 +1,50 @@
+//go:build darwin
+
+package update
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+// Apply downloads the new binary and schedules replacement after exit (macOS).
+func Apply(ctx context.Context, manifestURL string) (string, error) {
+	latest, _, _, exe, tmp, err := prepareDownload(ctx, manifestURL)
+	if err != nil {
+		return "", err
+	}
+	_ = os.Chmod(tmp, 0o755)
+	dir := filepath.Dir(exe)
+	scriptPath := filepath.Join(dir, "navis-update.sh")
+	pid := os.Getpid()
+
+	script := "#!/bin/bash\n" +
+		"set -e\n" +
+		"EXE=" + shellQuote(exe) + "\n" +
+		"NEW=" + shellQuote(tmp) + "\n" +
+		"PID=" + strconv.Itoa(pid) + "\n" +
+		"while kill -0 \"$PID\" 2>/dev/null; do sleep 0.4; done\n" +
+		"sleep 0.5\n" +
+		"mv -f \"$NEW\" \"$EXE\"\n" +
+		"chmod +x \"$EXE\"\n" +
+		"rm -f " + shellQuote(scriptPath) + "\n"
+
+	if err := os.WriteFile(scriptPath, []byte(script), 0o755); err != nil {
+		return "", err
+	}
+	cmd := exec.Command("/bin/bash", scriptPath)
+	cmd.Dir = dir
+	if err := cmd.Start(); err != nil {
+		return "", fmt.Errorf("start updater: %w", err)
+	}
+	return latest, nil
+}
+
+func shellQuote(s string) string {
+	return "'" + strings.ReplaceAll(s, "'", `'\''`) + "'"
+}