* add automatic OSC 7 support to bash and zsh
* add new wave OSC 16162 (planck length) to get up-to-date shell
information into blockrtinfo. currently implemented only for zsh. bash
will not support as rich of data as zsh, but we'll be able to do some.
* new rtinfo will be used to provide better context for AI in the
future, and to make sure AI is running safe commands.
* added a small local machine description to tab context (so AI knows
we're running on MacOS, Linux, or Windows)
