Hand-computed vectors for the pure landmark compute core: deterministic degree-filtered farthest-point anchors, exact integer quanta (floor(2.55/0.1)=25, two edges=50), 0xFFFF sentinel + self-cell laws, oneway asymmetry, the 65000-quantum overflow throw, and the 5x5-grid corner-to-corner 264-quanta vector with coverage 1.0.