The bulk update request #10113 has been approved by @nonamethanks.
create implication mecha -> robot
robot in theory is meant to be for "everything that doesn't have a more specific tag". That's of course never going to work.
I'm suggesting what was mentioned in topic #17594 some time ago, turning robot into an umbrella tag and having the various types of robots implied to it.
I don't know what to do with android and cyborg. The two tags seem to be used almost identically. I think honestly they should just be aliased together, maybe preserving cyborg as the main tag because android is too prone to canon tagging. topic #16456 comes to mind.
Even the wiki for cyborg says that it's hard to tell them apart.