vgsp-sema r581: do not pay the translation grace for provably-foreign rescued content

r577's foreign-release gate made unreadable entries take the !rel_seen path,
where each entry pays the full ce_grace_ms hold before the exact-slot
fallback delivers its pool step ('skipping stale entry ... after 8000 ms
grace' every ~8 s on the r577/r580 boots; a client's init crawls for
minutes). When the rescue decoded a release but the gate refused it as a
tracking slot, the content is provably stale/foreign: no work may run from
it (rescued work is never executed anyway) and the 8 s wait buys only the
small chance that the real page lands inside the window. Backdate
defer_since so the consume path delivers the pool step immediately; the
translation grace still applies to entries whose rescue decoded nothing
(their content may still be the real push).

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