nx_wflow_loop_gate.nx

nx_wflow_loop_gate.nx -- R11 LOOPS gate: for-each = apply-to-each over the connector plane. Step arg `<listexpr>~<template>`: the list substitutes ONCE (comma-split, 32-cap loud), then per item the engine binds {item} as a run variable, emits WFITER, substitutes the template, forks the connector. Any failed item fails the STEP (retry/on-fail machinery applies). Empty list = zero iterations, step OK. Proves the per-item argv actually varies (argecho), the last item persists as {item} for later steps, empty-list no-op, item failure fail-stops, load refusals. THREE forks. license_tier: ORIGINAL expect_exit: 0