Captures gitea#2 at the cache layer. Three tests:
- updateTask_seedsAllTasks_whenCacheIsEmpty (the core bug)
- updateTask_distributesAcrossColumns_whenSeedingThenAdding
- updateTask_replacesExistingTaskById_acrossColumns
All three FAIL on this commit because updateTask is a conditional
?.let{} that no-ops when _allTasks is null. Phase 1 fix in the next
commit makes them green.
Trey t
733d4c8d36