vgsp-sema r577: never let a foreign release VA claim a CE channel's tracking slot; event-record A/B knobs; GR-DEC dump deepened

r575 starved-release wedge (live): an unreadable UVM CE entry's rescued
stale page decoded a release to a foreign VA (0x12006c004, pay=60); the
rescue paths adopted it as the channel's tracking slot (last_rel_va) and
every later recovery release targeted it, while the client's real pool
(0x121000000) stopped at 25 - the client spun in uvm_tracker_wait for 34
(exact-slot poke delivered it and the client completed green). For CE
channels only a pool-shaped release target (0x121000000..0x122000000) may
become last_rel_va; a foreign rescued release is refused (witnessed,
bounded) and the pool step is delivered through the exact-slot fallback /
deferred-release machinery instead. The fake's read-before-write keeps the
delivery monotonic even when a legit push carries multiple releases.

Also: gsp_rm_ev_{seq,nlist,cl} runtime knobs for the guest-RM event drop
A/B (the r576 experiment: guest consumes every POST_EVENT record and never
enters nv_post_event), and the GR-DEC launch dump now covers 256 data
pages (the mail VADD fill carries n_data=969).

New: tools/cuda-ab/evhold.cu - deterministic CUDA event holder/wait probe
(context + cudaEventSynchronize + a hold window) for the event experiments.

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