feat(evaluators): add built-in budget evaluator for per-agent cost tracking#144

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amabito wants to merge 7 commits intoagentcontrol:mainfrom

amabito:feat/budget-evaluator

Commits on Mar 21, 2026

feat(evaluators): add built-in budget evaluator for per-agent cost tracking
amabito
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fix(evaluators): budget evaluator R1 -- security hardening + 6 adversarial tests
amabito
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fix(evaluators): budget R2 -- percent-encoding, fail-closed snapshot, dunder guard
amabito
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fix(evaluators): budget R4 -- clamp negative pricing cost to zero
amabito
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fix(evaluators): budget R5 -- isfinite guard on estimated cost
amabito
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fix(evaluators): budget R8 -- reject NaN/Inf limit_usd in config validation
amabito
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fix(evaluators): budget R10 -- prevent double-counting for shared scope+period
amabito
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