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Co-authored-by: LeiWang1999 <leiwang1999@outlook.com>

[Refactor] Refactor Pass `InjectFenceProxy` and expose some warp group primitives in frontend (#977)

* • InjectFenceProxy docs and tests

  - annotate proxy fence injector with context comments for async/generic detection
  - add compiler internals doc covering the pass mechanics and link it in docs index
  - repair fence proxy test by fixing descriptor init usage and fence counter logic

* do not consider call_extern as async.

* doc update.

* reduce test size for sparse mla