- Add comprehensive documentation for shm::release(id), shm::remove(id), and shm::remove(name)
- release(id): Decrements ref count, cleans up memory and disk file when count reaches zero
- remove(id): Calls release(id) internally, then forces disk file cleanup (WARNING: do not use after release)
- remove(name): Only removes disk file, safe to use anytime
- Fix critical double-free bug in ShmTest test cases
- Problem: calling release(id) followed by remove(id) causes use-after-free crash
because release() already frees the id structure
- Solution: replace 'release(id); remove(id);' pattern with just 'remove(id)'
- Fixed tests: AcquireCreate, AcquireCreateOrOpen, GetMemory, GetMemoryNoSize,
RemoveById, SubtractReference
- Kept 'release(id); remove(name);' pattern unchanged (safe usage)
- Add explanatory comments in test code to prevent future misuse
