[None][fix] Avoid pre-window SWA over-allocation on disagg gen server#13845
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For a disagg gen init request entering the V2 scheduler, context_current_position is still 0 — it is only advanced to prompt_len in _prepare_disagg_gen_transmission_complete after KV transfer completes. Passing history_length=context_current_position degenerates to history_length=0, the SWA stale range collapses to an empty interval, and pre-window blocks are still allocated before KV transfer — defeating the over-allocation fix from NVIDIA#13845/NVIDIA#14377. Use req.prompt_len, which is known statically at scheduler time and correctly conveys that the entire prompt is history. Signed-off-by: Shixiaowei02 <39303645+Shixiaowei02@users.noreply.github.com>
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