feat(simulation): NpcBlueprint struct design, RON schema, and validator CLI (#611)

Define ZoneSpec, CultureProfile, and NpcBlueprint structs with serde/RON
deserialization. Ship example RON files as schema contract for the copy
team (#609, #610). Add validate-ron CLI for copy team to lint their files
without compiling the server.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tooling/validate-ron

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# RON content validator — wrapper for the Rust validate_ron binary (#611).
+#
+# Usage:
+#   tooling/validate-ron <file.ron> <zone|culture>
+#
+# Examples:
+#   tooling/validate-ron content/global/zone-identity-spec.example.ron zone
+#   tooling/validate-ron content/global/culture-krenn.example.ron culture
+
+set -euo pipefail
+
+if [ $# -lt 2 ]; then
+    echo "Usage: tooling/validate-ron <file.ron> <zone|culture>"
+    echo ""
+    echo "Validates a RON file against the Rust struct schema."
+    echo "Schema types:"
+    echo "  zone    — ZoneSpec (zone identity spec)"
+    echo "  culture — CultureProfile (culture profile)"
+    exit 1
+fi
+
+# Resolve file to absolute path before changing directory
+FILE="$(realpath "$1")"
+SCHEMA="$2"
+
+cd "$(dirname "$0")/../server"
+exec cargo run --quiet --bin validate_ron -- "$FILE" "$SCHEMA"