Why: adjust_args_for_bin strips the leading space of its return while the
rebuilt args keep it, so every rebuild carrying --dsn/--auth compared
unequal and warned that the legacy binary had the flags dropped even when
nothing was dropped — misleading during incident triage.
Evidence: bash -n clean; against the real dev binary the normalized
comparison reports no drop and the flags survive intact; make test green.
Impact: warning now fires only when flags are actually filtered; no
behavioral change to start/deploy.
Refs: PR #188
weichen
421ee87d04