/usr/bin/puppet is in puppet-common 2.7.23-1~deb7u3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/usr/bin/ruby1.8
require 'puppet/util/command_line'
Puppet::Util::CommandLine.new.execute
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