nx_wflow_onerr_gate.nx

nx_wflow_onerr_gate.nx -- R10 ON-ERROR gate: optional 8th step field = forward on-fail target. On exhausted attempts the failure stays RECORDED (FAILSTEP + ONFAIL), wf_error=yes + wf_error_step land on the variable plane, remaining normal-path steps SKIP (recorded), execution lands at the handler -- which is guarded by an R9 condition (wf_error=yes) so the SUCCESS path skips it naturally. Composition of R8 vars + R9 conds, not a new mechanism. Hard failures (bad subst, denied approval) still hard-stop. ZERO forks. license_tier: ORIGINAL expect_exit: 0