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## Summary Add CI pipeline support for testing in environments without InfiniBand (IB) hardware. ## Changes ### IB stubs for no-IB builds (`src/core/ib.cc`) - Added stub implementations for `IbMr` and `IbQp` classes in the `#else // !defined(USE_IBVERBS)` block so the library links successfully when built with `-DMSCCLPP_USE_IB=OFF`. ### Environment variable to disable IB tests (`MSCCLPP_DISABLE_IB_TESTS`) - Added `disableIbTests` field to the `Env` class (`include/mscclpp/env.hpp`, `src/core/env.cpp`), reading from `MSCCLPP_DISABLE_IB_TESTS` env var. - Exposed as `disable_ib_tests` in Python bindings (`python/csrc/env_py.cpp`). - Updated `python/test/test_mscclpp.py` to skip IB-dependent tests (`create_group_and_connection` with IB transport, `test_h2h_semaphores`, `test_h2h_semaphores_gil_release`) when `env().disable_ib_tests` is true. ### CI pipeline (`ut-no-ib-env.yaml`, `ut.yml`) The no-IB environment pipeline runs two phases: 1. **No-IB build phase**: Build with `-DMSCCLPP_USE_IB=OFF`, deploy, run unit tests, multi-process unit tests, and pytests (with `MSCCLPP_DISABLE_IB_TESTS=1`). 2. **IB build phase**: Rebuild with IB enabled (default), stop the existing container, redeploy, and run pytests (with `MSCCLPP_DISABLE_IB_TESTS=1`) — verifying that the full IB-enabled build works correctly in a non-IB environment when IB tests are skipped. Also increased the job timeout from 40 to 60 minutes to accommodate the two-phase pipeline.