The affinity scheduler needs to know whether the current batch is led by a chunked request. The rebase carried call sites that referenced an old private field name, while PrefillAdder only retained a boolean flag, causing startup failure before scheduling could run.
Constraint: CP bs>1 affinity must classify a chunked-led batch without reopening chunked-tail mixing behavior.
Rejected: Recreate the old private _chunked_req_in_batch attribute | keeps a stale name and hides the public state transition in PrefillAdder.
Confidence: high
Scope-risk: narrow
Directive: Keep chunked_req_in_batch and has_chunked_req_in_batch updated together when adding new chunked admission paths.
Tested: Remote cjy-glm5-new: PYTHONPATH=python python -m pytest -q test/registered/unit/managers/test_prefill_adder.py -> 26 passed; combined run with scheduler load accounting tests -> 27 passed.
Not-tested: Full ETE restart after this commit alone.
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