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The "脑补推演" core the user described — re-run the same task many times and
learn from the contrast between good and bad rollouts:
- rollout.py: multi_rollout(task, k) runs K scored attempts; RolloutSet exposes
best/worst/spread/pass_rate. contrastive_reflect picks the highest-spread
tasks (some attempts passed, some failed — most informative) and asks the
optimizer what the GOOD attempts did that the BAD ones didn't, distilling a
general rule. Far stronger signal than a single failure.
- consolidate(rollouts_k>1) uses contrastive reflection (falls back to
single-shot reflect if it yields nothing).
- budget.py: Budget(max_tokens|max_minutes) tracks spend; plan_depth() derives
(nights, rollouts_k) from a token budget. run_gbrain gains --rollouts-k,
--budget-tokens, --budget-minutes (auto-plans depth).
3 new tests (rollout stats, budget+plan, contrastive stub). 26 tests pass.
Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>