docs: clarify event block compute compatibility

[ikenyal]

Problem

Issue #: N/A

The event-block compute targeting change in #459 exposes UnsupportedComputeException and routes AsyncJob and CronJob to their resolved Lambda compute. Their public READMEs still describe a shared Lambda and omit the new error. Realtime's public API comment also describes the wrong compute selection.

Changes

• Document the Lambda-only compute constraint and UnsupportedComputeException for AsyncJob and CronJob.
• Update AsyncJob and CronJob deployment descriptions to refer to the resolved Lambda compute.
• Document Realtime's default-compute requirement and correct its API comment.

Validation

• Ran npm run sync-docs:check.
• Ran git diff --check.
• No automated tests were added because this changes documentation and an API comment only.

Checklist

• PR description included
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

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