fix(schedule): close cron validation gaps

.agents/notes/implemented/feature/2026-08-05-durable-web-schedule.md

@@ -56,7 +56,7 @@ Schedule owns a numeric five-field parser rather than exposing Croner's language
 
 The frequency proof enumerates the complete 400-year Gregorian date cycle and combines it with exact times-of-day. It checks same-day neighbors, cross-midnight neighbors, and the cycle seam, rejecting any nominal interval below five minutes without maintaining a quota or sampling a shorter window.
 
-The exact production dependency is `croner@10.0.1`, an MIT-licensed ESM package with no transitive dependencies. Schedule gives it hidden seconds=`0` and year=`1-9999`, constructs it paused without a callback, and retains timer, gate, admission, and persistence ownership. The adapter rejects gap-normalized candidates, chooses the first instant in an overlap, and requires strict forward/backward cursor movement. JavaScript constructors remap years 0–99, so an owned local-calendar walker handles that lower range and its transition before safe-year searches delegate to Croner. Live create and due handling use current Croner and ICU; replay only checks canonical rule/zone shapes, whole-minute four-digit UTC instants, and `currentScheduledAt <= occurrenceAt <= acceptedAt < nextScheduledAt`, so tzdata changes never invalidate a committed history.
+The exact production dependency is `croner@10.0.1`, an MIT-licensed ESM package with no transitive dependencies. Schedule gives it hidden seconds=`0` and year=`1-9999`, constructs it paused without a callback, and retains timer, gate, admission, and persistence ownership. The adapter rejects gap-normalized candidates, chooses the first instant in an overlap, and requires strict forward/backward cursor movement. JavaScript constructors remap years 0–99, so an owned local-calendar walker handles that lower range and its transition before safe-year searches delegate to Croner. Live create and due handling, including the pre-append package invariant, use current Croner and ICU; replay only checks canonical rule/zone shapes, whole-minute four-digit UTC instants, and `currentScheduledAt <= occurrenceAt <= acceptedAt < nextScheduledAt`, so tzdata changes never invalidate a committed history.
 
 ### Persistence checkpoint and initialization recovery
 

.agents/notes/implemented/feature/2026-08-05-durable-web-schedule.zh.md

@@ -56,7 +56,7 @@ Schedule 拥有自己的数值五字段 parser，而不开放 Croner 语言。
 
 频率证明会枚举完整的 400 年 Gregorian 日期周期，并与精确的一日内时刻组合。它会检查同日相邻时点、跨午夜相邻时点与周期首尾衔接处的相邻时点，拒绝任何短于 5 分钟的名义间隔；整个过程既不维护配额，也不对更短窗口采样。
 
-生产环境精确锁定的依赖是 `croner@10.0.1`：这是一个采用 MIT 许可证、不含传递依赖的 ESM 包。Schedule 为其提供隐藏的 seconds=`0` 与 year=`1-9999`，以 paused 状态且不带 callback 构造；timer、门控、准入与持久化仍由 Schedule 拥有。适配器会拒绝由夏令时空档规范化产生的候选值，在重叠时段选择第一个时刻，并要求正向与反向 cursor 严格移动。JavaScript 构造器会重映射 0–99 年，因此 Schedule 自有的本地日历搜索会处理这一低年份范围及其向安全年份的过渡；只有安全年份搜索才会委托给 Croner。live create 与到期处理使用当前 Croner 和 ICU；回放只检查规范化的规则／时区 shape、整分钟且年份为四位数的 UTC 时点，以及 `currentScheduledAt <= occurrenceAt <= acceptedAt < nextScheduledAt`，因此 tzdata 变化绝不会使已提交的 history 失效。
+生产环境精确锁定的依赖是 `croner@10.0.1`：这是一个采用 MIT 许可证、不含传递依赖的 ESM 包。Schedule 为其提供隐藏的 seconds=`0` 与 year=`1-9999`，以 paused 状态且不带 callback 构造；timer、门控、准入与持久化仍由 Schedule 拥有。适配器会拒绝由夏令时空档规范化产生的候选值，在重叠时段选择第一个时刻，并要求正向与反向 cursor 严格移动。JavaScript 构造器会重映射 0–99 年，因此 Schedule 自有的本地日历搜索会处理这一低年份范围及其向安全年份的过渡；只有安全年份搜索才会委托给 Croner。live create 与到期处理（包括 append 前的 package invariant）使用当前 Croner 和 ICU；回放只检查规范化的规则／时区 shape、整分钟且年份为四位数的 UTC 时点，以及 `currentScheduledAt <= occurrenceAt <= acceptedAt < nextScheduledAt`，因此 tzdata 变化绝不会使已提交的 history 失效。
 
 ### Persistence checkpoint 与初始化恢复