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  "instrumentation": "Wrapped AgentMetricsService.finish_task_report only to record returned reports and session usage; no execution or accounting behavior changed.",
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    "exit_code": 0,
    "output": ".....                                                                    [100%]\n5 passed in 0.11s\n"
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    "verdict": "approved",
    "findings": [
      "reviewer(x) is a pure pass-through that calls writer(x) and returns its result unchanged, so the review layer cannot alter the value under review.",
      "Zero is handled correctly: reviewer(0) == 0, reviewer(0.0) == 0.0, and reviewer(-0.0) == 0.0; doubling preserves the additive identity.",
      "Negative inputs are handled correctly: sign is preserved and the magnitude is doubled exactly (e.g. -7 -> -14, -0.5 -> -1.0, -(2**40) -> -(2**41), Fraction(-2,7) -> Fraction(-4,7), Decimal('-0.125') -> Decimal('-0.250')).",
      "Fractional inputs are handled exactly: x * 2 only shifts the exponent for binary floats, so 0.5 -> 1.0, 1.25 -> 2.5, 0.1 -> 0.2, 3.75 -> 7.5; exact rationals (Fraction(1,3) -> Fraction(2,3)) and Decimals (Decimal('1.25') -> Decimal('2.50')) are also exact.",
      "Integer inputs of arbitrary size are exact because Python ints are unbounded, including values far beyond float precision such as 10**18 and 2**40.",
      "The additivity invariant f(x+y) == f(x) + f(y) holds exactly for every tested pair across ints, floats, Fractions, and Decimals, including zero-sum pairs (3 + -3), fractional cancellation (1.25 + -1.25), large cancellation (2**40 + -(2**40 + 1)), and cross-type sums (int + float, float + Fraction).",
      "No test failures and no exceptions were observed for zero, negative, or fractional inputs; writer.py was not modified."
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    "Buffered cache/cost/request tracker integration remains G34.",
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}