sema-svc: persist GR counter slot per channel; stable slot layout; bulk pin queue 4k

- counter_pa autoreg result is written back to the channel table so later
  passes cannot re-target a different slot when the live GR count changes
  during teardown; re-registration of the same channel preserves the slot.
- counter slot layout uses the max GR count ever seen in the generation
  instead of the shrinking live count.
- sema_map_add queue 64 -> 4096 entries so a full-window pin burst drains
  without ENOSPC retries.
- pin_gr_stream: one batched sudo pass per flush (was one process per run,
  ~4 s for 400 runs), retrying only queue-rejected runs.
- semfix_uvmt: SEMFIX_SKIP_PB=1 skips the blocking push-buffer chain walk
  when the vsock window stream already supplies those pages.

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