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/textutils/delimiter.go

@@ -0,0 +1,37 @@
+package textutils
+
+import (
+	"bytes"
+)
+
+// DelimiterForEveryLine puts the delimiter not just at the start and end of the string
+// but if the text is divided on multiple lines, puts the delimiters on every line with content.
+//
+// Otherwise the bold/italic delimiters won't be recognized if it contains new line characters.
+func DelimiterForEveryLine(text []byte, delimiter []byte) []byte {
+	var buf bytes.Buffer
+
+	lines := bytes.Split(text, []byte("\n"))
+	for i, line := range lines {
+		leftExtra, trimmed, rightExtra := SurroundingSpaces(line)
+
+		if trimmed == nil {
+			// For empty lines, we don't need a delimiter
+			buf.Write(leftExtra)
+			buf.Write(rightExtra)
+		} else {
+			buf.Write(leftExtra)
+			buf.Write(delimiter)
+			buf.Write(trimmed)
+			buf.Write(delimiter)
+			buf.Write(rightExtra)
+		}
+
+		// To join the lines again, add a newlines character
+		if i < len(lines)-1 {
+			buf.WriteRune('\n')
+		}
+	}
+
+	return buf.Bytes()
+}