fix(schedule): preserve resumed ancestor receipts

packages/schedule/tool-schedule/README.md

@@ -16,7 +16,7 @@ The package owns the strict version-1 `schedule/change` create, delete, and disp
 
 Replay rejects unknown versions, extra fields, reused ids, and delete or dispatch transitions against inactive records. Normal sessions fold the complete log. A fork folds only `session.events.slice(session.header.seedLength ?? 0)`, so it does not inherit its parent's reminders. The package's `./invariant` companion applies the same policy to existing logs and candidate events.
 
-`scheduleReminderPresentation(events, dispatchSeq, seedLength)` is the pure Host-facing receipt projection. It pairs a dispatch with the active create in the same ownership segment and returns `scheduleId`, prompt, occurrence, and `session-local` mode. A dispatch inside a persisted fork prefix folds from its nearest preceding `session/end-seed` boundary, so nested generations may reuse session-local ids without hiding ancestor receipts; a child-owned dispatch folds only the child suffix, so presentation never changes live ownership.
+`scheduleReminderPresentation(events, dispatchSeq, seedLength)` is the pure Host-facing receipt projection. It returns `scheduleId`, prompt, occurrence, and `session-local` mode from the dispatch's nearest preceding same-id create. The current fork's `seedLength` is a hard boundary for child-owned dispatches, while inherited dispatches search their persisted prefix; resumed ancestors therefore remain renderable, nested generations may reuse session-local ids, and presentation never changes live ownership.
 
 ## Management tools
 

packages/schedule/tool-schedule/README.zh.md

@@ -16,7 +16,7 @@
 
 回放会拒绝未知版本、额外字段、重复使用的 id，以及针对非活动记录的 delete 或 dispatch 转换。普通会话折叠完整日志。fork 只折叠 `session.events.slice(session.header.seedLength ?? 0)`，因此不会继承父会话的提醒。此包的 `./invariant` 配套项会对现有日志和候选事件应用相同策略。
 
-`scheduleReminderPresentation(events, dispatchSeq, seedLength)` 是供 Host 使用的纯回执投影。它把 dispatch 与同一 ownership segment 中的活动 create 配对，并返回 `scheduleId`、prompt、occurrence 和 `session-local` 模式。位于已持久 fork 前缀中的 dispatch 会从最近的前置 `session/end-seed` 边界开始折叠，因此嵌套 generation 可以复用会话本地 id，而不会隐藏祖先回执；child 自有 dispatch 只折叠 child 后缀，因此 presentation 绝不会改变 live ownership。
+`scheduleReminderPresentation(events, dispatchSeq, seedLength)` 是供 Host 使用的纯回执投影。它从 dispatch 之前最近的同 id create 返回 `scheduleId`、prompt、occurrence 和 `session-local` 模式。当前 fork 的 `seedLength` 是 child 自有 dispatch 的硬边界，而继承的 dispatch 则会搜索其已持久前缀；因此恢复后的祖先仍可渲染，嵌套 generation 可以复用会话本地 id，presentation 绝不会改变 live ownership。
 
 ## 管理工具
 

packages/schedule/tool-schedule/src/domain.ts

@@ -289,10 +289,9 @@ export function scheduleView(record: AfterScheduleRecord, now: number): Schedule
 
 /**
  * Derive the Web receipt for one dispatch from its owning stream segment.
- * A dispatch inside an inherited fork prefix folds from its nearest preceding
- * `session/end-seed` boundary; a child-owned dispatch folds only the child
- * suffix. Nested forks can therefore reuse session-local ids without hiding a
- * persisted ancestor receipt in descendant history.
+ * A child-owned dispatch cannot cross the current fork's `seedLength`.
+ * An inherited dispatch pairs with its nearest preceding same-id create, so
+ * resumed ancestors remain renderable and nested forks may reuse local ids.
  * @param events - Complete contiguous Session log.
  * @param dispatchSeq - Exact event seq to present.
  * @param seedLength - Inherited fork prefix length.
@@ -317,20 +316,34 @@ export function scheduleReminderPresentation(
   const dispatch = decodeScheduleChange(event.data)
   if (dispatch.operation !== 'dispatch') return undefined
 
-  const segmentStart = dispatchSeq < seedLength
-    ? events.slice(0, dispatchSeq).findLastIndex(candidate => candidate.type === 'session/end-seed') + 1
-    : seedLength
-  const before = foldScheduleEvents(events.slice(segmentStart, dispatchSeq))
-  const record = before.active.find(candidate => candidate.id === dispatch.id)
-  if (record === undefined) {
-    throw new ScheduleLogError(`schedule dispatch targets inactive id ${JSON.stringify(dispatch.id)}`)
+  const segmentStart = dispatchSeq < seedLength ? 0 : seedLength
+  for (let index = dispatchSeq - 1; index >= segmentStart; index -= 1) {
+    const candidate = events[index]
+    if (candidate?.type !== 'schedule/change') continue
+    const change = decodeScheduleChange(candidate.data)
+    switch (change.operation) {
+      case 'create':
+        if (change.schedule.id !== dispatch.id) break
+        return Object.freeze({
+          scheduleId: change.schedule.id,
+          prompt: change.schedule.prompt,
+          occurrenceAt: change.schedule.scheduledAt,
+          deliveryMode: 'session-local',
+        })
+      case 'delete':
+      case 'dispatch':
+        if (change.id === dispatch.id) {
+          throw new ScheduleLogError(`schedule dispatch targets inactive id ${JSON.stringify(dispatch.id)}`)
+        }
+        break
+      /* v8 ignore next 3 -- decodeScheduleChange returns a closed operation union. */
+      default: {
+        const unreachable: never = change
+        throw new ScheduleLogError(`unknown decoded schedule change ${String(unreachable)}`)
+      }
+    }
   }
-  return Object.freeze({
-    scheduleId: record.id,
-    prompt: record.prompt,
-    occurrenceAt: record.scheduledAt,
-    deliveryMode: 'session-local',
-  })
+  throw new ScheduleLogError(`schedule dispatch targets inactive id ${JSON.stringify(dispatch.id)}`)
 }
 
 /**

packages/schedule/tool-schedule/tests/domain.spec.ts

@@ -122,6 +122,33 @@ describe('version-1 Schedule decoding and folding', () => {
       occurrenceAt: '2026-08-05T12:00:00.000Z',
       deliveryMode: 'session-local',
     })
+    const resumedThenForked = [
+      scheduleEvent(createData('resumed-id', 'resumed prompt'), 0),
+      { type: 'session/end-seed', seq: 1, time: 1, data: {} } as SessionEvent,
+      scheduleEvent({ version: 1, operation: 'dispatch', id: 'resumed-id' }, 2),
+    ]
+    expect(scheduleReminderPresentation(resumedThenForked, 2, 3)).toEqual({
+      scheduleId: 'resumed-id',
+      prompt: 'resumed prompt',
+      occurrenceAt: '2026-08-05T12:00:00.000Z',
+      deliveryMode: 'session-local',
+    })
+    expect(() => scheduleReminderPresentation([
+      scheduleEvent(createData('parent-only'), 0),
+      { type: 'session/end-seed', seq: 1, time: 1, data: {} },
+      scheduleEvent({ version: 1, operation: 'dispatch', id: 'parent-only' }, 2),
+    ], 2, 2)).toThrow(/inactive id/)
+    expect(scheduleReminderPresentation([
+      scheduleEvent(createData('target'), 0),
+      scheduleEvent(createData('other'), 1),
+      scheduleEvent({ version: 1, operation: 'delete', id: 'other' }, 2),
+      scheduleEvent({ version: 1, operation: 'dispatch', id: 'target' }, 3),
+    ], 3)).toMatchObject({ scheduleId: 'target' })
+    expect(() => scheduleReminderPresentation([
+      scheduleEvent(createData('ended'), 0),
+      scheduleEvent({ version: 1, operation: 'delete', id: 'ended' }, 1),
+      scheduleEvent({ version: 1, operation: 'dispatch', id: 'ended' }, 2),
+    ], 2)).toThrow(/inactive id/)
     expect(scheduleReminderPresentation(events, 2, 2)).toBeUndefined()
     expect(scheduleReminderPresentation([
       { type: 'session/end-seed', seq: 0, time: 1, data: {} },