vgsp-sema: bounded fallback registration for a parked VAS candidate (15 s)

The VAS candidate verification needs the client's ring to be found by the
RAM content scan; on a boot where that never anchors the ring the
candidate stays parked forever and every launch operand walk fails rc=-2
(observed: pd_found=0, vas[0] holding an internal pdb, walks stuck at
9555 successes with 114 K attempts while the client spun for minutes).
After 15 s parked, register the candidate unverified with a loud log: it
came from the client's own RM publish and the newest-first walk order
keeps an older stale directory from winning, so the bounded wait's
registration is the lesser evil.

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