Without this: vllm server crashes immediately on startup with argparse error:
'unrecognized arguments: --reasoning-parser qwen3'
because computility-run.yaml passes this flag but vllm 0.6.3 does not
recognize it. The container stays running but HTTP server never becomes
ready, causing benchmark-agent to poll indefinitely (status=running).
This is likely why task_id=3905102 benchmark has been running for 36+
minutes without result — the vllm process died but the container lives on.
Changes:
cli_args.py: Add --reasoning-parser as accepted argument (str, default=None)
The value is parsed by argparse but not used by api_server.py or
serving_chat.py — it is a stub that prevents the crash.
Actual reasoning token separation (<think>...</think>) for Qwen3 models
would require implementing a ReasoningParser class similar to ToolParser.
For now, reasoning tokens will appear in the response content, which
is acceptable for functional tests (content is correct, just includes
thinking tokens).
CCCL context: dispatch_batch_memcpy.cuh's two-level dispatch pattern:
small buffers → single CTA (fast path, no coordination overhead)
large buffers → multi CTA (slow path, needs scan+select)
Analogously: known CLI args → fast parse, unknown → crash.
Adding the stub is the 'fast path' that avoids the crash.
