Calibrate lossless Strategy Prefill budget

[FluffyAIcode]

Summary

• raise the Strategy hard admission limit from 4096 to 8192 tokens
• preserve the zero-truncation contract while admitting the current complete 7259-token branch
• retain Generator/Critic budgets at 6144 tokens

Test plan

• targeted AutoResearch tests: 41 passed
• supervisor compile check

The uncommitted candidate.py file is active runtime state and is excluded.

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