Add Doris Schoolhouse and clean pending homelab changes

home/doris-schoolhouse/bin/test-assignment-handoff.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+if [ "$#" -lt 2 ]; then
+  echo "usage: $0 <file> <class_name> [assignment_name]" >&2
+  exit 1
+fi
+FILE="$1"
+CLASS_NAME="$2"
+ASSIGNMENT_NAME="${3:-Sample Assignment}"
+TARGET="${N8N_BASE_URL:-https://n8n.example.com}${SCHOOLHOUSE_N8N_ASSIGNMENT_WEBHOOK:-/webhook/school/intake/upload}"
+cat <<MSG
+Dry-run assignment handoff preview
+Target: $TARGET
+Command:
+curl -X POST "$TARGET" \\
+  -F "document=@$FILE" \\
+  -F "class_name=$CLASS_NAME" \\
+  -F "assignment_name=$ASSIGNMENT_NAME" \\
+  -F "submission_kind=assignment_turn_in" \\
+  -F "source=doris-schoolhouse"
+MSG