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* independent logfmt_simulate function

* draft: logfmt low latency combine

* Minor bug fixes

* Fix non-logfmt bugs

* Fix logfmt bugs

* Fix logfmt bugs

* Minor fix

* Minor fix

* Clean code

* Clean code

* Use fewer regs

* Use two warp groups

* Correct shared memory size

* Minor fix

* Minor fix

* More rigorous tests

* Clean code

* Use more SMs

* Use different unroll factor for send & recv

* Update csrc/kernels/internode_ll.cu
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update csrc/kernels/internode_ll.cu
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Some renaming

* Some comments of tests

* Format `logfmt_encode`

* More lints

* Some refactors on sends

* Fix testing

* Fix bugs

* Renaming

* Use the full warp

* Unify combine recv

* Lint

* Lint

* Support 2560

* Fix meta buffer dtype

* Better encode calls

* Better amin/max writes

* Extra sync

* Read `topk_idx` by once

* Better specialization

* Read weights by once

* Rename

* Bug fixed

* Some renaming

* Fix local memory usage for sending

* Fix local memory usage for receiving

* Less writes

* Optimize performance

* Optimize performance

* Better performance

* Optimize performance

* Fix rounding

* Manually unroll

* Fix bench

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Chenggang Zhao <chenggangz@deepseek.com>