2026-06-29-mainchain-gap-fill

⟦tag:v2|task|2026-06-29-mainchain-gap-fill⟧ kind: task id: 2026-06-29-mainchain-gap-fill objective: 收掉 28 号仍可能遗留的任务-剧情主链、失败终局主链与 aftermath / 重开断点，保持主链闭环。 scope: docs/handoff/**, docs/plans/backlog/remaining-version-requirements-2026-06-29.md, src/data/storyEvents/**, src/data/eventTables/**, src/utils/storylineYearCompiler.ts, src/endgame/taskLineFailureRuntime.ts, src/utils/failureEndgameTaskLine.ts, src/utils/failureEndgame.ts, src/endgame/saveSnapshot.ts, src/components/StoryTracking*.tsx, src/components/JianghuBriefing*.tsx, src/components/Endgame*.tsx, src/components/SystemHubPanel.tsx acceptance:

• 任务主链、失败主链、终局回退不再有“能触发但不能追踪”或“能复盘但不能回退”的断点
• 主链与 aftermath 口径保持同一组风险来源
• 不新增剧情库、终局库或存档字段 current state: verified blockers: none next action: none

summary:

• worker callback received; lane acceptance is satisfied by runtime wiring and build verification.
• 28 P0 follow-up closure is already recorded separately and is no longer this lane's blocker.