vgsp-sema: bounded sema-norel diagnostic for readable CE pushes without a releaseHEADmaster

The entries the pump holds for the 8 s CE grace are exactly the ones whose
decode found no release. Under SEMA_DBG this logs the decode state
(have_sem, rel va/payload, ops) and the first 64 push bytes for every
content-bearing CE push that decoded no release (2048-line budget,
all-zero reads are filtered so they cannot wash it out). Used in r129 to
show that a push whose tail crosses the CE page boundary reads 0xFF
garbage for its second page - the sem+LAUNCH_DMA live exactly in that
tail, so only boundary-crossing pushes were undecodable.

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