feat: Add timeout arguments to WaitForData and Flush

[ryancundiff]

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[Copilot]

Pull request overview

This PR extends the server-side lifecycle/persistence APIs to accept explicit timeout controls for WaitForData and Flush, and updates the persistence implementation so WaitForData can reliably time out even when no further state transitions occur (e.g., under LoadFailurePolicy = "Wait" during prolonged outages).

Changes:

• Add optional timeout parameter to Data.WaitForData / Persistence.WaitForData (default 60s) and enforce it via a deadline-based wait.
• Add optional Timeout option to Data.Flush / Persistence.Flush (default 15s) by forwarding it to AwaitSave.
• Add lifecycle specs covering the new timeout behaviors and update typecheck/docs to match the new API surface.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/TypeCheck.luau	Updates typecheck usage to pass timeout to WaitForData and Timeout to Flush.
test/Specs/Lifecycle.spec.luau	Adds tests ensuring WaitForData/Flush honor explicit timeouts and don’t hang.
src/Server/Persistence.luau	Implements deadline-based waiting for WaitForData and forwards opts.Timeout through Flush.
src/Server/init.luau	Updates server API signatures and docstrings for WaitForData(timeout?) and Flush({ Timeout? }).
src/init.luau	Updates exported type definitions for WaitForData and Flush options.
README.md	Updates example comment to reflect default timeout wording.
docgen/guides/lifecycle.md	Updates lifecycle guide to document WaitForData(player, timeout?).

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