vgsp-sema: kernel-native pool release translation + starvation telemetry (ISSUE-0001)

svc_pool_pa_resolve() could translate an UVM pool/waiter page only from
watcher pins, the read-back cache, the self-discovered directory and a
targeted rm_mem scan. When the userspace watcher races a boot and the
self-discovered directory has no entry yet, a starved completion release
sits in svc_pending[] forever (p13-r4: applied frozen at 89/90, gr_rel=0),
the guest tracker never wakes and CUDA blocks at DEVICE. Add:
- svc_walk_vaspaces() (the driver-published page directories - the walker
  svc_lookup_trusted always used, previously absent here);
- a final proof-gated svc_lookup_trusted() fallback (also the only path
  that triggers svc_pd_discover()).
Both read-back proven like every other source. Plus per-entry starvation
telemetry (tries + bounded logs) so a future stall names the exact va.

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