vgsp: m176 cross-session poison elimination wave - (1) session generation svc_sess_gen bumped by every executed flush; channels+scrubbers stamp it and never inherit per-session learned state (counter_pa/release_pa/rel_done/scrub counts) across a generation (a recycled handle after a flush kept the dead client's write targets: releases landed on - and were forward-only skipped against - the old page while the new client polled its own slot forever: late-boot first-cudaMalloc stall); (2) session flush now clears the 60s targeted-scan failure holds (tr_failed - late clients whose pool page was reachable were still blocked), drops a stale forwarding hold and the captured GR candidate; (3) gsp_rm_emu_reset drops ALL event records regardless of parse state (guest reboot/reload leaves zombies that absorb or suppress new clients' wake-ups) and the FREE retire now requires the record's h_client (hRoot) to match the freed hEvent's owner so a late FREE can never retire a recycled-handle record of a live client; (4) opdef log budget re-armed per sessionHEADmaster

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