p1: /v2/scrape, /v1/fetch, auth, CLI, contract tests

Single Fetcher.Fetch on the Guard that holds DenyPrefixes. skipTlsVerification
is ignored. No 502. keys add writes the secret only to --out. Release binary
has no -test-allow-prefix.

vendor/github.com/JohannesKaufmann/html-to-markdown/v2/internal/domutils/span.go

@@ -0,0 +1,50 @@
+package domutils
+
+import (
+	"context"
+
+	"github.com/JohannesKaufmann/dom"
+	"golang.org/x/net/html"
+)
+
+func isFakeSpan(node *html.Node) bool {
+	name := dom.NodeName(node)
+	if name != "span" {
+		return false
+	}
+
+	var containsBlockNode = false
+
+	var finder func(*html.Node)
+	finder = func(node *html.Node) {
+		name := dom.NodeName(node)
+		if dom.NameIsBlockNode(name) {
+			containsBlockNode = true
+			return
+		}
+
+		for child := node.FirstChild; child != nil; child = child.NextSibling {
+			finder(child)
+		}
+	}
+	finder(node)
+
+	return containsBlockNode
+}
+
+// RenameFakeSpans renames all "span" nodes to "div" if
+// any block element is found as a child.
+func RenameFakeSpans(ctx context.Context, doc *html.Node) {
+	var finder func(node *html.Node)
+	finder = func(node *html.Node) {
+		if isFakeSpan(node) {
+			node.Data = "div"
+		}
+
+		for child := node.FirstChild; child != nil; child = child.NextSibling {
+			finder(child)
+		}
+	}
+
+	finder(doc)
+}