refs #703: force Smilegate PoC HTTP 1.1

deploy/caddy/smilegate/Caddyfile

@@ -1,6 +1,9 @@
 {
 	servers {
-		protocols h1 h2
+		# A client HTTP/2 connection retained queued response bytes after Caddy
+		# completed schema-metadata. Serve the Smilegate PoC over HTTP/1.1 until
+		# that client-side flow-control path is proven stable.
+		protocols h1
 	}
 }