restructure: flatten scripts dirs, remove roster, update SKILL.md

git-hangman-lab/scripts/check-git-cred

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+GIT_URL="https://git.hangman-lab.top"
+
+USER="$(secret-mgr get-username --key git)"
+PASS="$(secret-mgr get-secret --key git)"
+
+if [[ -z "$USER" || -z "$PASS" ]]; then
+  echo "Missing credentials from secret-mgr (key: git)"
+  exit 2
+fi
+
+response=$(curl -s -w "%{http_code}" -u "$USER:$PASS" "$GIT_URL/api/v1/user")
+http_code="${response: -3}"
+body="${response:0:-3}"
+
+if [[ "$http_code" == "200" ]]; then
+  echo "OK"
+  exit 0
+elif [[ "$http_code" == "401" ]]; then
+  echo "AUTH FAILED"
+  exit 1
+else
+  echo "ERROR: HTTP $http_code"
+  echo "$body"
+  exit 1
+fi