Rebase vLLM to v0.28.0

[Sanidhya Singal (quic-sanising)]

Rebases the QAIC plugin from vLLM v0.23.0 to v0.28.0.

Version bumps

• setup.py, pyproject.toml, scripts/utility.sh: v0.23.0 → v0.28.0
• requirements/vllm_dependency_{aot,pyt}.txt: aligned with upstream v0.28.0 (transformers, fastapi/starlette, prometheus-fastapi-instrumentator, xgrammar, mistral_common, jsonschema; dropped diskcache/gguf)
• requirements/lint.txt: pre-commit → >=4.5.1

v0.28.0 API adaptations

• patch_parallel_state.py: add use_all2all arg to QaicGroupCoordinator (new GroupCoordinator param)
• worker/model_runner.py: unpack new _num_nans_device from _bookkeeping_sync; set self.pin_memory = False (upstream moved to module-level PIN_MEMORY); patch torch.cuda.Event in _torch_cuda_wrapper
• patch_block_table.py: handle new SlotMappingMode (early-return for NONE)
• patch_rejection_sampler.py: pass synthetic_mode/synthetic_conditional_rates/use_fp64_gumbel to rejection_sample; drop stale skip-softmax path
• patch_mem_utils.py: capability-guard platform memory hooks + add MemorySnapshot.__post_init__ override
• __init__.py: apply graph-pickler Options shim at import (torch < 2.8 compat)

Transformers 5.15.1 compatibility

• qaic_custom_mm_processor.py: fallback import for Qwen2VLImageProcessorFast; widen version gate to
  >= 5.5.4

Test / CI

• test_qaic_lora.py: fix swapped seq_len/ctx_len (violated new long_prefill_token_threshold ≤ max_model_len check)
• requirements/test.txt: consolidate test deps (drop linters, add datasets)
• ci_pipeline_run_plugin.sh: install test deps from requirements/test.txt (single source of truth)

Validation

• examples/qaic.py runs end-to-end in AOT
• AOT CI (ci_fasttest_qaic_aot.sh) passes

[Ankit Arora (ankitqti)]

Create a new branch "dev/v0.28.0" and make PR on that

Did you ran ci_scripts/ci_fasttest_qaic_aot.sh?

[Sanidhya Singal (quic-sanising)]

Create a new branch "dev/v0.28.0" and make PR on that

Did you ran ci_scripts/ci_fasttest_qaic_aot.sh?

Ankit Arora (@ankitqti) The PR is not ready yet. I'll let you know once it is ready.

[Sanidhya Singal (quic-sanising)]

Create a new branch "dev/v0.28.0" and make PR on that

Did you ran ci_scripts/ci_fasttest_qaic_aot.sh?

[scheduler] 15/15 job(s) passed
[scheduler] total execution time: 417.8s (0:06:58)

[Ankit Arora (ankitqti)]

Update vLLM version in ,md files if needed in documentation folder

[Sanidhya Singal (quic-sanising)]

Update vLLM version in ,md files if needed in documentation folder

Done. How do we manage release details and repo structure in docs/docs/community/release_notes.md and docs/STRUCTURE.md?