Update build scripts and README: Enhance build command to include static HTML checks and curriculum validation, streamline development process with new dev script, and clarify local development instructions. Update curriculum wiring in catalog to support dynamic subject loading and improve Mermaid map integration.

scripts/dev.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cleanup() {
+  if [[ -n "${JS_PID:-}" ]] && kill -0 "${JS_PID}" 2>/dev/null; then
+    kill "${JS_PID}"
+  fi
+}
+
+trap cleanup EXIT INT TERM
+
+bun run dev:js &
+JS_PID=$!
+
+zola serve