Add wiki to local repo

check.sh

@@ -1,8 +1,4 @@
 #!/bin/bash
-# The full gate, ending in a line that survives a pipe: "=== CHECK EXIT n ===".
-# `npm run check | tail -20` reports tail's exit code, not npm's, so a red run reads as green –
-# and `set -o pipefail` in here does not help, it only covers pipes inside this script (measured).
-# Reading the closing line does.
 
 set -o pipefail
 npm run check