Revert "r469 THE streams_events staging-reuse corruption root cause: a GR entry whose push content is implausible (unwritten / previous-epoch page, no QMD word seen) was consumed as a no-op and the end-of-pass counter publish then advanced the guest's completion word while the real push had never been read - the client drained a staging buffer that still held the PREVIOUS copy's bytes (probe run: BUF s=2 got=c0's 0,0.75,1.5.. instead of c2's 3.0,5.25,7.5..; log: 'pub-adv h=0x5c000062 val=4 cur=1' at 210741.947, 4.5 s before the c2 D2H copy executed at 210746.371, with the ring slots decoded as zero-content pushes at 210736). The implausible-content read now feeds the m164 GR no-capture hold (bounded gsp_sema_gr_nocap_hold_ms window, rehold forces a fresh capture): the entry stays unconsumed, the publish gate (last_get != put) suppresses the early completion, and the retry reads the client's real push once it lands. Plausible fallback reads (validated pin / displaced pair) clear the flag."

This reverts commit 349ee341539a0c1e9e3be11563251589eb42f8a8.

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