Fix: the conductor's commands now agree with each other and with their help. An explicit --case-dir that does not exist is refused instead of acting on the case in the working directory; an unknown --only stage is a usage error, not a traceback; stale 64-bit executables name the INDEX_BITS=64 rebuild they need; native executables report the same <release>.dev<N>+g<commit> version as picurv --version; picurv build -- -j8 passes make options; submit --stage all submits every staged stage; a staged run's summary reports planned steps; usage errors are structured CLI_USAGE_INVALID errors with exit code 2, with hints that name the command; storage options and legacy commands gained help text and their replacements.