Optional
Default resource limits applied to every extension. The host may tighten per-extension via settings; the spec calls out a default of 64 MiB memory, 5s sync CPU, 30s async window.
Optional clock for deterministic tests.
Optional shared SDK reference. Future ctx fields (storage, fetch, notify) hang off this; today only bim is plumbed through.
bim
Default resource limits applied to every extension. The host may tighten per-extension via settings; the spec calls out a default of 64 MiB memory, 5s sync CPU, 30s async window.