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/go-shiori/go-readability/internal/re2go/check-byline.re

@@ -0,0 +1,20 @@
+/*!include:re2c "base.re" */
+
+// Original pattern: (?i)byline|author|dateline|writtenby|p-author
+func IsByline(input string) bool {
+	var cursor, marker int
+	input += string(rune(0)) // add terminating null
+	limit := len(input) - 1  // limit points at the terminating null
+	_ = marker
+
+	for { /*!use:re2c:base_template
+		re2c:case-insensitive = 1;
+
+		byline = byline|author|dateline|writtenby|p-author;
+
+		{byline} { return true }
+		*        { continue }
+		$        { return false }
+		*/
+	}
+}