* add fsdp2 smokle test for ray trainer * fix raytrain with fsdp2
* use exec instead of subprocess to make ctrl+c nicer for cli * change var name to use_exec * simplify to bool * flush std* * patch subprocess as mock in test * fix tests * more test fixes
* add --launcher option; explicit True/False bool args; small cleanup * refactor * add torchrun, accelerate cli args * add rdzv arg default + tests * update _quarto * coderabbit * fix * we can't set rdvz_id independently across nodes * coderabbit * fix tests