Reject too-long HCA names

[fallintoplace]

Summary

• Reject HCA list entries whose names would exceed the fixed nvshmemt_hca_info::name buffer.
• Propagate parser failures through shared HCA filter setup and the IB transport init paths that consume it.

Root cause

nvshmemt_parse_hca_list() appended HCA name characters without checking the name[64] capacity. The unsafe append is present from the public import; later shared-IB refactoring preserved the behavior.

Testing

• git diff --check
• CMake configure attempted with tests enabled and unrelated build pieces disabled; blocked locally because CUDA toolkit / nvcc is not installed (Failed to find nvcc).