fix(agent): inject Shanghai time into each reply message

103 goosed harness_remember returns remembered:false, so session memory
never carried the time anchor. Prepend buildCurrentTimeAgentPrefix on every
H5 /reply and WeChat agent prompt so the model sees Asia/Shanghai clock.

Co-authored-by: Cursor <cursoragent@cursor.com>

user-memory-profile.mjs

@@ -192,6 +192,14 @@ export function resolveTimeOfDayPeriod(hour) {
   return { period: '晚上', greeting: '晚上好' };
 }
 
+export function buildCurrentTimeAgentPrefix({ now = Date.now(), timezone = DEFAULT_TIMEZONE } = {}) {
+  return [
+    '【TKMind 时间基准 - 仅供回答时间/日期/时段问候，不要向用户复述】',
+    renderCurrentTimeAnchor({ now, timezone }),
+    '',
+  ].join('\n');
+}
+
 export function renderCurrentTimeAnchor({ now = Date.now(), timezone = DEFAULT_TIMEZONE } = {}) {
   const { year, month, day } = formatDateParts(now, timezone);
   const { hour, minute } = formatLocalClockParts(now, timezone);