v0.8.0

Highlights

• Breaking: ledger.cancelWork(...) now targets a durable WorkRef instead of the storage-local workId.
• Add workKey to actions.enqueue(...) and actions.enqueueSignal(...) options.
• Keyed work snapshots now expose ref values composed from source event id, signal flag, queue name, and work key.
• This lets consumers cancel logical work items without relying on auto-increment row ids.