The store created an $effect.root for the save-on-change sync but returned no
disposer, so the effect leaked for the life of the process — contradicting
the rule that $effect.root owners must expose destroy(). Capture and expose
the disposer.
- add destroy() to the returned store; covered by tests (flushSync proves the
save effect runs before destroy and stops after)
- trim the bloated header (two near-duplicate @example blocks) to one concise
JSDoc — no fluff
- update typographySettings test mocks to satisfy the now-required destroy()
Consumers (LayoutManager, ThemeManager, typographySettings, comparisonStore)
do not yet call it — threading + the createSingleton migration follow.
Ilia Mashkov