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condu.sx: defmacro `condu` folds clauses through a runtime `condu-try` walker. First clause whose head yields a non-empty stream commits its single first answer; later clauses are not tried. `onceo` is the simpler sibling — stream-take 1 over a goal's output. 10 tests cover: onceo trimming success/failure/conde, condu first-clause wins, condu skips failing heads, condu commits-and-cannot-backtrack to later clauses if the rest of the chosen clause fails. 110/110 cumulative. Phase 2 complete.