* [Enhancement] Use atomic directory rename for cache writes
Replace per-file os.replace with write-to-staging + os.rename to
ensure other processes never see an incomplete cache directory.
Also add cleanup of stale staging dirs on init.
* [Bugfix] Fix atomic cache save: abort on critical file failure and fix staging cleanup
- Let kernel lib and params save failures propagate instead of swallowing
them, so the staging directory is cleaned up rather than renamed as an
incomplete cache entry.
- Move autotuner staging directory to TILELANG_CACHE_DIR so that
_cleanup_stale_staging_dirs() can find and remove stale entries.
* Fix atomic cache save recovery and error handling
* Remove unnecessary blank lines in _FakeAdapter and _FakeKernel classes in autotune and cache test files.
* Tighten atomic cache completeness checks
* Simplify atomic cache save error handling
* submodule update
* remove legacy test
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Co-authored-by: Freebase6912 <amid-gauze-racing@duck.com>
