feat(archive): keep page open on captcha-status errors so callers can promote

Adds OpenPageOptions.AllowNonOKStatus. When set, openPage no longer closes
the page on non-2xx (other than 404) and Open returns both a usable Document
and ErrInvalidStatusCode. archive.IsArchived and Archive opt in, so callers
can PromoteToInteractive the captcha page, hand it to a human solver, and
demote back to extract content from the same browser instance — avoiding
the cf_clearance fingerprint-binding issue that re-challenges any fresh
retry browser.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

playwright.go

@@ -293,13 +293,19 @@ func (b playWrightBrowser) openPage(_ context.Context, target string, opts OpenP
 	slog.Info("opened document", "url", target, "status", resp.Status(), "request", resp.Request())
 
 	if resp.Status() < 200 || resp.Status() >= 300 {
-		_ = page.Close()
-
 		if resp.Status() == 404 {
+			_ = page.Close()
 			return nil, ErrPageNotFound
 		}
 		slog.Info("invalid status code", "status", resp.Status(), "request", resp.Request())
-		return nil, fmt.Errorf("%w: %d", ErrInvalidStatusCode, resp.Status())
+		statusErr := fmt.Errorf("%w: %d", ErrInvalidStatusCode, resp.Status())
+		if !opts.AllowNonOKStatus {
+			_ = page.Close()
+			return nil, statusErr
+		}
+		// Caller asked to keep the page on non-2xx (e.g. to interact with a
+		// Cloudflare captcha page that returned 403). Return both.
+		return page, statusErr
 	}
 
 	return page, nil
@@ -307,17 +313,25 @@ func (b playWrightBrowser) openPage(_ context.Context, target string, opts OpenP
 
 func (b playWrightBrowser) Open(ctx context.Context, url string, opts OpenPageOptions) (Document, error) {
 
-	page, err := b.openPage(ctx, url, opts)
-	if err != nil {
-		return nil, err
+	page, openErr := b.openPage(ctx, url, opts)
+	if page == nil {
+		return nil, openErr
 	}
 
-	err = b.updateCookies(ctx, page)
-	if err != nil {
-		return nil, err
+	if cookieErr := b.updateCookies(ctx, page); cookieErr != nil {
+		_ = page.Close()
+		return nil, cookieErr
 	}
 
-	return newDocument(b.pw, b.browser, page)
+	doc, docErr := newDocument(b.pw, b.browser, page)
+	if docErr != nil {
+		_ = page.Close()
+		return nil, docErr
+	}
+
+	// openErr may be ErrInvalidStatusCode when AllowNonOKStatus was set; the
+	// page is still usable, so propagate both the doc and the error.
+	return doc, openErr
 }
 
 func (b playWrightBrowser) Close() error {