vgsp: hold every unreadable CE entry for the grace; delete the silent pre-rescue fake

An unreadable CE entry whose channel already had a decoded release VA was faked immediately and consumed with no log line, before any rescue attempt. A later pin-batch rewind then executed the skipped copy against a staging buffer the client had since refilled - the deterministic vadd input shift seen in runs 94/122/151/173b/215b, each with a silent pre-rescue fake.

Now every unreadable CE entry with an expected payload is held for the bounded grace and the rescue is retried on each pass, so a translation that is still coming wins and the work runs before the release. Only an entry whose release was already delivered (the channel moved past entry_want) is consumed at once; the post-rescue fake remains the bounded, visible escape. The CE grace default moves 15000 -> 25000 ms (a translation arrived ~17 s after first examination in 215b).

Under live campaign 229-236 (module 97eba5b7; green so far).

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