Implemented Active Effects.

Used AE to implement exhaustion, stimulants, and rest.

module/utils/active-effect-submit.js

@@ -0,0 +1,45 @@
+import DG from "../config.js";
+import { getStatisticEffectiveValue } from "./derived-actor-data.js";
+
+/**
+ * Strip form values that match post–AE prepared numbers so persisted data stays at base values.
+ * @param {Actor} actor
+ * @param {object} data Update payload (mutated in place).
+ * @returns {object}
+ */
+export function sanitizeActiveEffectBackedUpdateData(actor, data) {
+  if (!data?.system) return data;
+
+  const source = actor._source?.system;
+  if (!source) return data;
+
+  sanitizeStatisticValues(actor, data, source);
+
+  return data;
+}
+
+/**
+ * @param {Actor} actor
+ * @param {object} data
+ * @param {object} source
+ */
+function sanitizeStatisticValues(actor, data, source) {
+  for (const key of DG.statistics) {
+    const submitted = foundry.utils.getProperty(
+      data,
+      `system.statistics.${key}.value`,
+    );
+    if (submitted === undefined) continue;
+
+    const sourceStat = source.statistics?.[key];
+    const preparedStat = actor.system.statistics?.[key];
+    if (!sourceStat || !preparedStat) continue;
+
+    const base = sourceStat.value;
+    const effective = getStatisticEffectiveValue(preparedStat, sourceStat);
+
+    if (submitted === effective && submitted !== base) {
+      foundry.utils.setProperty(data, `system.statistics.${key}.value`, base);
+    }
+  }
+}