workflow run/resume --json is contracted to emit a single JSON object on
stdout, but every error path (workflow-not-found, invalid workflow,
validation failure, execute/resume failure, and the shared
_parse_input_values invalid-input error) used console.print, landing the
human error text on stdout and corrupting the machine-readable stream.
Route those messages through err_console when --json is set (a no-op for
normal text mode), mirroring the stderr-only error routing already used
by 'specify bundle' (_fail) and err_console elsewhere in this module.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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