Feature: Squash command

[pcfreak30]

Issue

add a /squash that will run diffs on selected commits or a git compat syntax for commit ranges and use the weak model to summarize.

What I am also very often doing is creating manual wip commits + automated ones, then i go back and manually squash everything and generalize one large commit + pr. being able to do similar without doing the effort manual would be a large time saver.

Version and model info

No response