feat(store): recordTrain with pruning and getSummary

tests/store.test.js

@@ -1,8 +1,12 @@
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { Store } from '../src/store.js';
+import { MS_PER_DAY } from '../src/pure.js';
 import { createLocalStorage } from './localstorage-shim.js';
 
+const DAY = MS_PER_DAY;
+const NOW = 1_700_000_000_000;
+
 function freshStore() {
   return new Store({ storage: createLocalStorage() });
 }
@@ -70,3 +74,28 @@ test('Store: latches off further saves after a storage write failure', () => {
   assert.equal(s.getTarget('strength'), 25_000_000);
   assert.equal(s.getTarget('speed'), 50_000_000);
 });
+
+test('Store: recordTrain appends to per-attribute history', () => {
+  const s = freshStore();
+  s.recordTrain('strength', 247, NOW);
+  s.recordTrain('strength', 250, NOW - 1000);
+  assert.equal(s.history.strength.length, 2);
+  assert.equal(s.history.strength[0].delta, 247);
+});
+
+test('Store: recordTrain prunes entries older than 30 days', () => {
+  const s = freshStore();
+  s.recordTrain('strength', 100, NOW - 31 * DAY);
+  s.recordTrain('strength', 200, NOW);
+  assert.equal(s.history.strength.length, 1);
+  assert.equal(s.history.strength[0].delta, 200);
+});
+
+test('Store: getSummary returns computed summary for attribute', () => {
+  const s = freshStore();
+  s.recordTrain('strength', 247, NOW - 1000);
+  s.recordTrain('strength', 247, NOW - 2000);
+  const sum = s.getSummary('strength', NOW);
+  assert.equal(sum.trainsToday, 2);
+  assert.equal(sum.perDay, Math.floor((2 / 7) * 247));
+});