vgsp: client-VAS CE ring probe + L0 sanity gate (V12, default off)

- CE siblings (0xbeef0101/0102): extend the beef-family ring discovery
  with an identity probe and the GR guest-RAM content scan plus a
  sparse-run gate and a RAM ring-page ownership table; keep >=2 fresh
  same-VAS park candidates during the client's VAS churn.
- Add svc_pdb_l0_sane() and apply it to unverified directory candidates
  so a freed/reused incarnation is skipped instead of walked.
- Both behaviors are gated behind sema_ce_ram (default 0): the live A/B
  latched false positives on dense data pages and the L0 predicate needs
  tightening before it may guard the GR lane (the validated V9/V10 GR
  behavior is preserved by the default).

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