vgsp-sema: SESSION 130 zero-payload application + tail-arbitration witness - a zero-headed tail-served payload is now applied under a variant once-key (h | 1) instead of being refused forever (the destination is empty, so authoring zeros is idempotent and correct for the driver's internal zero buffer, whose 256 B i2m equals GF100_ZERO_BUFFER_SIZE exactly), while a later non-zero payload for the same entry still matches its own (h) key and lands; the utildec witness now carries alt=success/tries so a walk-read that fails is distinguishable from one that returns zero

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