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docs(sqs): make sync/async resolver support explicit (#403)

Invalidation trigger resolvers already support both synchronous and
asynchronous forms: the `InvalidationResolver` type returns
`ResolverOutput<TAction> | Promise<ResolverOutput<TAction>>`, and the
dispatch pipeline `await`s the result, so a non-Promise return resolves
immediately and a Promise is awaited before actions are applied.

Make this explicit:
- Expand the `InvalidationResolver` JSDoc to spell out that it may be sync
  or async.
- Flesh out the README "Resolver semantics" section with sync and async
  examples instead of the one-line aside.
- Add an end-to-end test exercising an async resolver that derives keys via
  an awaited I/O lookup.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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