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fix(signals): a render effect's first run goes through under an async gate (#4343) (#4353)

A render effect's synchronous first run on creation is not a queued run
and goes through behind a fallback (D-19), but runEffect asked the
boundary hook on every call. Under `<Loading> > <Show when={ready()}> >
<Loading>`, a `ready` async memo settling mounts the inner content while
the outer boundary is still on its fallback in that flush, so the first
run was held there, then held again behind the inner fallback until the
inner data landed. With `ready` a signal no fallback was up at creation
and the effect ran at once. The creation call now passes type 0 and the
hook is asked only for queued runs; user effects still wait for the
reveal.

Fixes #4343


Claude-Session: https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

Co-authored-by: Claude <noreply@anthropic.com>

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