RUE-1466: omit redundant live-out range scan - #2324
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Fixes RUE-1466.
Summary
Evidence
Fixed one-worker cold Lattice, 16 balanced pairs against the exact RUE-1465 baseline: retired instructions -0.1051% (0.0868% MAD); clock, cycles, and peak memory neutral. Four allocation-accounted pairs are neutral. All compiler-work, source, and output metrics are exact; executable bytes are unchanged.
Validation
scripts/rue fmtscripts/rue unit codegen liveness(37 passed)scripts/rue quick(31 targets passed)