feat(detection-core): replay admission evidence

.kiro/specs/detection-core/tasks.md

@@ -280,7 +280,7 @@
   - Done when forged decisions, substituted contracts, invalid fact review, contaminated lineage, or case-count drift fail before metric production.
   - _Requirements: 12.5, 12.6, 15.1, 15.2_
   - _Depends: 8.7_
-- [ ] 8.9 Assemble evidence-backed gates and the final admission report
+- [x] 8.9 Assemble evidence-backed gates and the final admission report
   - Emit instrument, budget, readiness, and quality gates with reasons and supporting identities.
   - Bind the report to the validation context, authorization, pre-label spend receipt, authenticated case release, census, and complete case-result set.
   - Require every mandatory metric and gate before allowing GO; make model success mandatory when a model is baseline-configured or validated claimed-scope calls occur. Refuse undeclared claimed-scope calls before report production; make configured zero-call, missing-threshold, and failed declared-call cases NO-GO while ignoring out-of-scope-only calls.

src/openultrasast/core/_admission_gates.py

@@ -0,0 +1,341 @@
+"""Typed evidence and re-derived gates for final admission reports."""
+
+from __future__ import annotations
+
+import math
+import re
+from dataclasses import dataclass
+from enum import Enum
+
+from openultrasast.core import canonical
+from openultrasast.core.admission_case import (
+    AdmissionCaseResult,
+    derive_admission_case_result_digest,
+    validate_admission_case_shape,
+)
+from openultrasast.core.admission_review import AdmissionThreshold, derive_threshold_set_digest
+from openultrasast.core.coverage import validate_instrument
+from openultrasast.core.measurement import (
+    BaselineIdentity,
+    Comparator,
+    MetricId,
+    MetricResult,
+    Statistic,
+    metric_passes,
+)
+from openultrasast.core.measurement_record import MeasurementRecordV2, ReadinessReference
+from openultrasast.core.readiness import StageResult
+
+BUDGET_EVALUATION_SCHEMA = "openultrasast.detection-core.admission-budget-evaluation.v2"
+THRESHOLD_EVALUATION_SCHEMA = "openultrasast.detection-core.admission-threshold-evaluation.v2"
+_DIGEST = re.compile(r"[0-9a-f]{64}")
+_MANDATORY_METRICS = tuple(MetricId)[:6]
+
+
+class AdmissionReportError(ValueError):
+    """Admission evidence cannot form a valid final report."""
+
+
+class GateKind(Enum):
+    INSTRUMENT = "instrument"
+    BUDGET = "budget"
+    QUALITY = "quality"
+    READINESS = "readiness"
+
+
+@dataclass(frozen=True)
+class GateResult:
+    kind: GateKind
+    gate_id: str
+    passed: bool
+    reasons: tuple[str, ...]
+    evidence_digests: tuple[str, ...]
+
+    def __post_init__(self) -> None:
+        validate_gate(self)
+
+
+@dataclass(frozen=True)
+class CaseBudgetEvaluation:
+    case: AdmissionCaseResult
+    case_result_digest: str
+    budget_derivation_digest: str
+    total_reply_ms: int
+    budget_ms: int
+    evaluation_digest: str
+
+    def __post_init__(self) -> None:
+        validate_budget_evaluation(self)
+
+
+@dataclass(frozen=True)
+class ThresholdEvaluation:
+    metric_id: MetricId
+    statistic: Statistic
+    comparator: Comparator
+    target: float
+    measurement_record_digest: str
+    passed: bool
+    evaluation_digest: str
+
+    def __post_init__(self) -> None:
+        validate_threshold_evaluation(self)
+
+
+def _digest(value: object, field: str) -> None:
+    if not isinstance(value, str) or _DIGEST.fullmatch(value) is None:
+        raise AdmissionReportError(f"{field} must be a full lowercase SHA-256 digest")
+
+
+def _canonical_digests(value: object, field: str, *, allow_empty: bool = False) -> tuple[str, ...]:
+    if not isinstance(value, tuple) or not all(isinstance(item, str) for item in value):
+        raise AdmissionReportError(f"{field} must be a tuple of digests")
+    for item in value:
+        _digest(item, field.removesuffix("s"))
+    if value != tuple(sorted(set(value))):
+        raise AdmissionReportError(f"{field} must be unique and canonical")
+    if not allow_empty and not value:
+        raise AdmissionReportError(f"{field} must not be empty")
+    return value
+
+
+def validate_gate(value: GateResult) -> None:
+    if type(value) is not GateResult:
+        raise AdmissionReportError("gate must be an exact GateResult")
+    if not isinstance(value.kind, GateKind) or not isinstance(value.gate_id, str) or not value.gate_id:
+        raise AdmissionReportError("gate kind and gate_id must use closed nonempty values")
+    if not isinstance(value.passed, bool):
+        raise AdmissionReportError("gate passed must be boolean")
+    if not isinstance(value.reasons, tuple) or not all(isinstance(item, str) and item for item in value.reasons):
+        raise AdmissionReportError("gate reasons must be a tuple of nonempty text")
+    if value.reasons != tuple(sorted(set(value.reasons))):
+        raise AdmissionReportError("gate reasons must be unique and canonical")
+    if value.passed == bool(value.reasons):
+        raise AdmissionReportError("passed gates have no reasons and failed gates require reasons")
+    _canonical_digests(value.evidence_digests, "gate evidence digests")
+
+
+def gate_value(value: GateResult) -> dict[str, canonical.JsonValue]:
+    validate_gate(value)
+    return {
+        "kind": value.kind.value,
+        "gate_id": value.gate_id,
+        "passed": value.passed,
+        "reasons": value.reasons,
+        "evidence_digests": value.evidence_digests,
+    }
+
+
+def _make_gate(kind: GateKind, gate_id: str, reasons: tuple[str, ...], evidence: tuple[str, ...]) -> GateResult:
+    canonical_reasons = tuple(sorted(set(reasons)))
+    canonical_evidence = tuple(sorted(set(evidence)))
+    return GateResult(kind, gate_id, not canonical_reasons, canonical_reasons, canonical_evidence)
+
+
+def budget_evaluation_value(value: CaseBudgetEvaluation) -> dict[str, canonical.JsonValue]:
+    return {
+        "schema_version": BUDGET_EVALUATION_SCHEMA,
+        "case_result_digest": value.case_result_digest,
+        "budget_derivation_digest": value.budget_derivation_digest,
+        "total_reply_ms": value.total_reply_ms,
+        "budget_ms": value.budget_ms,
+    }
+
+
+def validate_budget_evaluation(value: CaseBudgetEvaluation) -> None:
+    if type(value) is not CaseBudgetEvaluation:
+        raise AdmissionReportError("budget evaluation must use the exact type")
+    if type(value.case) is not AdmissionCaseResult:
+        raise AdmissionReportError("budget evaluation must carry the exact admission case")
+    validate_admission_case_shape(value.case)
+    if value.case.result_digest != derive_admission_case_result_digest(value.case):
+        raise AdmissionReportError("budget evaluation case result digest cannot be re-derived")
+    _digest(value.case_result_digest, "case result digest")
+    _digest(value.budget_derivation_digest, "budget derivation digest")
+    for item, field in ((value.total_reply_ms, "total reply milliseconds"), (value.budget_ms, "budget milliseconds")):
+        if isinstance(item, bool) or not isinstance(item, int) or item <= 0:
+            raise AdmissionReportError(f"{field} must be a positive integer")
+    _digest(value.evaluation_digest, "budget evaluation digest")
+    expected = (
+        value.case.result_digest,
+        value.case.budget.derivation_digest,
+        value.case.total_reply_ms,
+        value.case.budget.budget_ms,
+    )
+    actual = (value.case_result_digest, value.budget_derivation_digest, value.total_reply_ms, value.budget_ms)
+    if actual != expected:
+        raise AdmissionReportError("budget evaluation does not match the exact case-to-budget derivation")
+    if value.evaluation_digest != canonical.content_digest(budget_evaluation_value(value)):
+        raise AdmissionReportError("budget evaluation digest does not match content")
+
+
+def make_budget_evaluations(cases: tuple[AdmissionCaseResult, ...]) -> tuple[CaseBudgetEvaluation, ...]:
+    values = []
+    for case in cases:
+        fields = (
+            case,
+            case.result_digest,
+            case.budget.derivation_digest,
+            case.total_reply_ms,
+            case.budget.budget_ms,
+        )
+        draft = object.__new__(CaseBudgetEvaluation)
+        for field, item in zip(CaseBudgetEvaluation.__dataclass_fields__, (*fields, "0" * 64), strict=True):
+            object.__setattr__(draft, field, item)
+        digest = canonical.content_digest(budget_evaluation_value(draft))
+        values.append(CaseBudgetEvaluation(*fields, digest))
+    return tuple(sorted(values, key=lambda item: item.case_result_digest))
+
+
+def threshold_evaluation_value(value: ThresholdEvaluation) -> dict[str, canonical.JsonValue]:
+    return {
+        "schema_version": THRESHOLD_EVALUATION_SCHEMA,
+        "metric_id": value.metric_id.value,
+        "statistic": value.statistic.value,
+        "comparator": value.comparator.value,
+        "target": value.target,
+        "measurement_record_digest": value.measurement_record_digest,
+        "passed": value.passed,
+    }
+
+
+def validate_threshold_evaluation(value: ThresholdEvaluation) -> None:
+    if type(value) is not ThresholdEvaluation:
+        raise AdmissionReportError("threshold evaluation must use the exact type")
+    if not isinstance(value.metric_id, MetricId) or not isinstance(value.statistic, Statistic):
+        raise AdmissionReportError("threshold evaluation metric and statistic must use closed enums")
+    if not isinstance(value.comparator, Comparator):
+        raise AdmissionReportError("threshold evaluation comparator must use the closed enum")
+    if isinstance(value.target, bool) or not isinstance(value.target, float) or not math.isfinite(value.target):
+        raise AdmissionReportError("threshold evaluation target must be a finite float")
+    _digest(value.measurement_record_digest, "threshold measurement record digest")
+    if not isinstance(value.passed, bool):
+        raise AdmissionReportError("threshold evaluation passed must be boolean")
+    _digest(value.evaluation_digest, "threshold evaluation digest")
+    if value.evaluation_digest != canonical.content_digest(threshold_evaluation_value(value)):
+        raise AdmissionReportError("threshold evaluation digest does not match content")
+
+
+def make_threshold_evaluations(
+    thresholds: tuple[AdmissionThreshold, ...],
+    measurement: MeasurementRecordV2,
+) -> tuple[ThresholdEvaluation, ...]:
+    by_metric = {item.metric_id: item for item in measurement.metrics}
+    values = []
+    for threshold in thresholds:
+        passed = metric_passes(by_metric[threshold.metric_id], threshold.statistic, threshold.comparator, threshold.target)
+        fields = (
+            threshold.metric_id,
+            threshold.statistic,
+            threshold.comparator,
+            threshold.target,
+            measurement.record_digest,
+            passed,
+        )
+        draft = object.__new__(ThresholdEvaluation)
+        for field, item in zip(ThresholdEvaluation.__dataclass_fields__, (*fields, "0" * 64), strict=True):
+            object.__setattr__(draft, field, item)
+        digest = canonical.content_digest(threshold_evaluation_value(draft))
+        values.append(ThresholdEvaluation(*fields, digest))
+    return tuple(values)
+
+
+def _thresholds(evaluations: tuple[ThresholdEvaluation, ...]) -> tuple[AdmissionThreshold, ...]:
+    return tuple(AdmissionThreshold(item.metric_id, item.statistic, item.comparator, item.target) for item in evaluations)
+
+
+def instrument_gate(
+    case_result_digests: tuple[str, ...],
+    cases: tuple[AdmissionCaseResult, ...],
+) -> GateResult:
+    evidence = _canonical_digests(case_result_digests, "case result digests")
+    identities = tuple(sorted(item.result_digest for item in cases))
+    if identities != evidence or len(identities) != len(cases):
+        raise AdmissionReportError("instrument cases must cover the exact complete case-result set")
+    try:
+        for case in cases:
+            validate_instrument(case.input_manifest, case.input_receipts)
+    except (TypeError, ValueError) as exc:
+        raise AdmissionReportError(f"instrument gate evidence is invalid: {exc}") from exc
+    return _make_gate(GateKind.INSTRUMENT, "instrument:all_cases", (), evidence)
+
+
+def budget_gate(
+    case_result_digests: tuple[str, ...],
+    evaluations: tuple[CaseBudgetEvaluation, ...],
+) -> GateResult:
+    if not isinstance(evaluations, tuple) or not all(type(item) is CaseBudgetEvaluation for item in evaluations):
+        raise AdmissionReportError("budget evaluations must use the exact typed tuple")
+    for item in evaluations:
+        validate_budget_evaluation(item)
+    identities = tuple(item.case_result_digest for item in evaluations)
+    if identities != case_result_digests or len(set(identities)) != len(identities):
+        raise AdmissionReportError("budget evaluations must cover the exact complete case-result set")
+    reasons = tuple(f"budget_exceeded:{item.case_result_digest}" for item in evaluations if item.total_reply_ms > item.budget_ms)
+    evidence = tuple(item.evaluation_digest for item in evaluations)
+    return _make_gate(GateKind.BUDGET, "budget:all_cases", reasons, evidence)
+
+
+def readiness_gate(references: tuple[ReadinessReference, ...]) -> GateResult:
+    reasons = tuple(f"readiness_failed:{item.stage.value}" for item in references if item.result is not StageResult.PASSED)
+    evidence = tuple(item.result_digest for item in references)
+    return _make_gate(GateKind.READINESS, "readiness:prerequisites", reasons, evidence)
+
+
+def quality_gate(
+    identity: BaselineIdentity,
+    measurement: MeasurementRecordV2,
+    evaluations: tuple[ThresholdEvaluation, ...],
+) -> GateResult:
+    if not isinstance(evaluations, tuple) or not all(type(item) is ThresholdEvaluation for item in evaluations):
+        raise AdmissionReportError("quality threshold evaluations must use the exact typed tuple")
+    by_metric = {item.metric_id: item for item in measurement.metrics}
+    reasons = _mandatory_metric_reasons(by_metric)
+    model = by_metric[MetricId.MODEL_SUCCESS_RATE]
+    reasons.extend(_model_reasons(identity, model, evaluations))
+    for item in evaluations:
+        validate_threshold_evaluation(item)
+        if item.measurement_record_digest != measurement.record_digest:
+            raise AdmissionReportError("threshold evaluation does not bind the exact measurement")
+        expected = metric_passes(by_metric[item.metric_id], item.statistic, item.comparator, item.target)
+        if item.passed is not expected:
+            raise AdmissionReportError("threshold evaluation outcome does not match the exact metric")
+        if not expected:
+            reasons.append(f"threshold_failed:{item.metric_id.value}:{item.statistic.value}")
+    thresholds = _thresholds(evaluations)
+    try:
+        threshold_set_digest = derive_threshold_set_digest(thresholds)
+    except ValueError as exc:
+        raise AdmissionReportError(f"quality threshold evaluations are invalid: {exc}") from exc
+    if threshold_set_digest != identity.threshold_set_digest:
+        raise AdmissionReportError("threshold evaluations do not match the exact threshold set")
+    evidence = (identity.threshold_set_digest, measurement.record_digest, *(item.evaluation_digest for item in evaluations))
+    return _make_gate(GateKind.QUALITY, "quality:threshold_set", tuple(reasons), evidence)
+
+
+def _model_reasons(
+    identity: BaselineIdentity,
+    model: MetricResult,
+    evaluations: tuple[ThresholdEvaluation, ...],
+) -> list[str]:
+    reasons: list[str] = []
+    model_configured = bool(identity.model_program_digests)
+    model_executed = model.denominator > 0
+    model_applicable = model_configured or model_executed
+    model_threshold_count = sum(item.metric_id is MetricId.MODEL_SUCCESS_RATE for item in evaluations)
+    if model_applicable and model_threshold_count == 0:
+        reasons.append("mandatory_model_success_threshold_missing")
+    if model_configured and not model_executed:
+        reasons.append("mandatory_model_success_has_no_attempted_calls")
+    if model_executed and model.numerator < model.denominator:
+        reasons.append("mandatory_model_call_failed")
+    return reasons
+
+
+def _mandatory_metric_reasons(by_metric: dict[MetricId, MetricResult]) -> list[str]:
+    reasons = []
+    for metric in _MANDATORY_METRICS:
+        result = by_metric.get(metric)
+        if result is None or result.denominator == 0:
+            reasons.append(f"mandatory_metric_missing_or_zero:{metric.value}")
+    return reasons

src/openultrasast/core/_admission_replay.py

@@ -0,0 +1,136 @@
+"""Immutable transport identity for authoritative admission replay inputs."""
+
+from __future__ import annotations
+
+import re
+from dataclasses import dataclass
+from typing import TYPE_CHECKING
+
+from openultrasast.core import canonical
+from openultrasast.core.admission_case import (
+    AdmissionCaseRelease,
+    AdmissionCaseResult,
+    derive_admission_case_release_digest,
+    derive_admission_case_result_digest,
+)
+from openultrasast.core.admission_review import AdmissionManifestV2, derive_manifest_digest
+from openultrasast.core.admission_spend import AdmissionPreparation, derive_admission_preparation_digest
+from openultrasast.core.custody import (
+    PopulationUseReceipt,
+    derive_population_use_receipt_digest,
+)
+from openultrasast.core.measurement import DenominatorPolicy, derive_denominator_policy_digest
+from openultrasast.core.readiness import ReadinessResult, validate_readiness_result
+
+if TYPE_CHECKING:
+    from openultrasast.core.admission_report import AdmissionReportV2
+
+ADMISSION_REPLAY_SCHEMA = "openultrasast.detection-core.admission-replay.v2"
+_DIGEST = re.compile(r"[0-9a-f]{64}")
+
+
+@dataclass(frozen=True)
+class AdmissionReplay:
+    manifest: AdmissionManifestV2
+    denominator: DenominatorPolicy
+    readiness: tuple[ReadinessResult, ...]
+    preparation: AdmissionPreparation
+    label_release_receipt: PopulationUseReceipt
+    case_release: AdmissionCaseRelease
+    cases: tuple[AdmissionCaseResult, ...]
+    report: AdmissionReportV2
+    replay_digest: str
+
+    def __post_init__(self) -> None:
+        validate_admission_replay_structure(self)
+
+
+def _replay_value(value: AdmissionReplay) -> canonical.JsonValue:
+    manifest_digest = derive_manifest_digest(value.manifest)
+    denominator_digest = derive_denominator_policy_digest(value.denominator)
+    preparation_digest = derive_admission_preparation_digest(value.preparation)
+    receipt_digest = derive_population_use_receipt_digest(value.label_release_receipt)
+    release_digest = derive_admission_case_release_digest(value.case_release)
+    for item in value.readiness:
+        validate_readiness_result(item)
+    case_digests = tuple(derive_admission_case_result_digest(item) for item in value.cases)
+    claimed = (
+        value.manifest.manifest_digest,
+        value.denominator.policy_digest,
+        value.preparation.preparation_digest,
+        value.label_release_receipt.receipt_digest,
+        value.case_release.release_digest,
+        tuple(item.result_digest for item in value.cases),
+    )
+    derived = (manifest_digest, denominator_digest, preparation_digest, receipt_digest, release_digest, case_digests)
+    if claimed != derived:
+        raise ValueError("replay component identity cannot be re-derived")
+    return {
+        "schema_version": ADMISSION_REPLAY_SCHEMA,
+        "manifest_digest": manifest_digest,
+        "denominator_policy_digest": denominator_digest,
+        "readiness_result_digests": tuple(item.result_digest for item in value.readiness),
+        "preparation_digest": preparation_digest,
+        "label_release_receipt_digest": receipt_digest,
+        "case_release_digest": release_digest,
+        "case_result_digests": case_digests,
+        "report_digest": value.report.report_digest,
+    }
+
+
+def _validate_components(value: AdmissionReplay) -> None:
+    exact_components = (
+        (value.manifest, AdmissionManifestV2, "manifest"),
+        (value.denominator, DenominatorPolicy, "denominator"),
+        (value.preparation, AdmissionPreparation, "preparation"),
+        (value.label_release_receipt, PopulationUseReceipt, "label release receipt"),
+        (value.case_release, AdmissionCaseRelease, "case release"),
+    )
+    for item, expected, field in exact_components:
+        if type(item) is not expected:
+            raise ValueError(f"replay {field} must use the exact contract type")
+    if not all(type(item) is ReadinessResult for item in value.readiness):
+        raise ValueError("replay readiness must contain exact ReadinessResult values")
+    if not all(type(item) is AdmissionCaseResult for item in value.cases):
+        raise ValueError("replay cases must contain exact AdmissionCaseResult values")
+    case_ids = tuple(item.case_id_digest for item in value.cases)
+    if case_ids != tuple(sorted(set(case_ids))):
+        raise ValueError("replay cases must use unique canonical case identity order")
+
+
+def validate_admission_replay_structure(value: AdmissionReplay) -> None:
+    from openultrasast.core.admission_report import AdmissionReportError, AdmissionReportV2, _validate_report_structure
+
+    if type(value) is not AdmissionReplay:
+        raise AdmissionReportError("replay must be an exact AdmissionReplay")
+    if type(value.readiness) is not tuple or not value.readiness:
+        raise AdmissionReportError("replay readiness must be an exact nonempty tuple")
+    if type(value.cases) is not tuple or not value.cases:
+        raise AdmissionReportError("replay cases must be an exact nonempty tuple")
+    try:
+        _validate_components(value)
+    except (AttributeError, TypeError, ValueError) as exc:
+        raise AdmissionReportError(str(exc)) from exc
+    if type(value.report) is not AdmissionReportV2:
+        raise AdmissionReportError("replay report must be an exact AdmissionReportV2")
+    _validate_report_structure(value.report)
+    if not isinstance(value.replay_digest, str) or _DIGEST.fullmatch(value.replay_digest) is None:
+        raise AdmissionReportError("replay digest must be a full lowercase SHA-256 digest")
+    try:
+        expected = canonical.content_digest(_replay_value(value))
+    except (AttributeError, TypeError, ValueError) as exc:
+        raise AdmissionReportError(str(exc)) from exc
+    if value.replay_digest != expected:
+        raise AdmissionReportError("replay digest does not match authoritative input identities")
+
+
+def admission_replay_value(value: AdmissionReplay) -> canonical.JsonValue:
+    validate_admission_replay_structure(value)
+    return _replay_value(value)
+
+
+__all__ = [
+    "ADMISSION_REPLAY_SCHEMA",
+    "AdmissionReplay",
+    "admission_replay_value",
+]

src/openultrasast/core/admission_metrics.py

@@ -24,7 +24,7 @@ from openultrasast.core.admission_case import (
 from openultrasast.core.admission_context import AdmissionValidationContext
 from openultrasast.core.admission_review import AdmissionManifestV2, ScopeCensus, validate_reviewed_admission_payloads
 from openultrasast.core.admission_spend import AdmissionPreparation
-from openultrasast.core.budget import check_budget
+from openultrasast.core.budget import BudgetGateFailure, check_budget
 from openultrasast.core.coverage import CoverageFunnel, ReasonCount, validate_instrument
 from openultrasast.core.custody import PopulationCustodyPort, PopulationUseReceipt
 from openultrasast.core.evidence import EvidenceBasis, EvidenceRecord, NeutralOutcome, derive_packet_digest
@@ -139,6 +139,8 @@ def _validated_records(
         raise AdmissionMetricsError(f"instrument validation failed: {exc}") from exc
     try:
         check_budget(case.complexity, case.total_reply_ms, case.budget, resolver)
+    except BudgetGateFailure:
+        pass
     except (TypeError, ValueError) as exc:
         raise AdmissionMetricsError(f"budget validation failed: {exc}") from exc
     try:
@@ -206,9 +208,7 @@ def _validate_population(cases: tuple[_ValidatedCase, ...], rows: tuple[ScopeCen
     for row in rows:
         selected = tuple(item for item in cases if item.binding.scope == row.scope)
         roles = Counter(item.binding.role for item in selected)
-        model_calls = sum(
+        model_calls = sum(value.model_result is not None for item in selected for value in item.supplied.evidence_inputs)
-            value.model_result is not None for item in selected for value in item.supplied.evidence_inputs
-        )
         actual = (
             len(selected),
             roles[AdmissionCaseRole.VULNERABLE],

src/openultrasast/core/admission_report.py

@@ -0,0 +1,424 @@
+"""Evidence-backed admission gates and canonical final reports."""
+
+from __future__ import annotations
+
+import re
+from collections.abc import Sequence
+from dataclasses import dataclass
+from enum import Enum
+
+from openultrasast.core import canonical
+from openultrasast.core._admission_gates import (
+    AdmissionReportError,
+    CaseBudgetEvaluation,
+    GateKind,
+    GateResult,
+    ThresholdEvaluation,
+    budget_evaluation_value,
+    budget_gate,
+    gate_value,
+    instrument_gate,
+    make_budget_evaluations,
+    make_threshold_evaluations,
+    quality_gate,
+    readiness_gate,
+    threshold_evaluation_value,
+)
+from openultrasast.core._admission_replay import (
+    ADMISSION_REPLAY_SCHEMA,
+    AdmissionReplay,
+    _replay_value,
+    admission_replay_value,
+    validate_admission_replay_structure,
+)
+from openultrasast.core.admission_case import AdmissionCaseRelease, AdmissionCaseResult
+from openultrasast.core.admission_context import AdmissionValidationContext
+from openultrasast.core.admission_metrics import AdmissionMetricEvidence, derive_admission_metrics
+from openultrasast.core.admission_review import AdmissionManifestV2
+from openultrasast.core.admission_spend import AdmissionPreparation
+from openultrasast.core.custody import PopulationCustodyPort, PopulationUseReceipt
+from openultrasast.core.measurement import (
+    BaselineIdentity,
+    DenominatorPolicy,
+    derive_baseline_identity_digest,
+)
+from openultrasast.core.measurement_factory import create_measurement_record
+from openultrasast.core.measurement_record import MeasurementRecordV2, ReadinessReference, measurement_record_value
+from openultrasast.core.readiness import ReadinessResult, ReadinessStage
+
+ADMISSION_REPORT_SCHEMA = "openultrasast.detection-core.admission-report.v2"
+_DIGEST = re.compile(r"[0-9a-f]{64}")
+_PREREQUISITE_STAGES = tuple(ReadinessStage)[:6]
+
+
+class AdmissionDecision(Enum):
+    GO = "go"
+    NO_GO = "no_go"
+
+
+@dataclass(frozen=True)
+class AdmissionReportV2:
+    identity: BaselineIdentity
+    census_digest: str
+    validation_context_digest: str
+    authorization_digest: str
+    label_release_receipt_digest: str
+    case_release_digest: str
+    case_result_digests: tuple[str, ...]
+    in_scope_case_count: int
+    whole_population_case_count: int
+    budget_evaluations: tuple[CaseBudgetEvaluation, ...]
+    quality_evaluations: tuple[ThresholdEvaluation, ...]
+    measurement: MeasurementRecordV2
+    instrument_results: tuple[GateResult, ...]
+    budget_results: tuple[GateResult, ...]
+    readiness_results: tuple[GateResult, ...]
+    quality_results: tuple[GateResult, ...]
+    decision: AdmissionDecision
+    report_digest: str
+
+    def __post_init__(self) -> None:
+        _validate_report_structure(self)
+
+
+def _digest(value: object, field: str) -> None:
+    if not isinstance(value, str) or _DIGEST.fullmatch(value) is None:
+        raise AdmissionReportError(f"{field} must be a full lowercase SHA-256 digest")
+
+
+def _case_digests(value: object, count: int) -> tuple[str, ...]:
+    if not isinstance(value, tuple) or not all(isinstance(item, str) for item in value):
+        raise AdmissionReportError("case result digests must be a tuple of digests")
+    for item in value:
+        _digest(item, "case result digest")
+    if value != tuple(sorted(set(value))) or len(value) != count:
+        raise AdmissionReportError("case result digests must identify every case exactly once in canonical order")
+    return value
+
+
+def _report_value(value: AdmissionReportV2) -> canonical.JsonValue:
+    return {
+        "schema_version": ADMISSION_REPORT_SCHEMA,
+        "baseline_identity_digest": derive_baseline_identity_digest(value.identity),
+        "census_digest": value.census_digest,
+        "validation_context_digest": value.validation_context_digest,
+        "authorization_digest": value.authorization_digest,
+        "label_release_receipt_digest": value.label_release_receipt_digest,
+        "case_release_digest": value.case_release_digest,
+        "case_result_digests": value.case_result_digests,
+        "in_scope_case_count": value.in_scope_case_count,
+        "whole_population_case_count": value.whole_population_case_count,
+        "budget_evaluations": tuple(
+            {**budget_evaluation_value(item), "evaluation_digest": item.evaluation_digest} for item in value.budget_evaluations
+        ),
+        "quality_evaluations": tuple(
+            {**threshold_evaluation_value(item), "evaluation_digest": item.evaluation_digest} for item in value.quality_evaluations
+        ),
+        "measurement_record_digest": value.measurement.record_digest,
+        "instrument_results": tuple(gate_value(item) for item in value.instrument_results),
+        "budget_results": tuple(gate_value(item) for item in value.budget_results),
+        "readiness_results": tuple(gate_value(item) for item in value.readiness_results),
+        "quality_results": tuple(gate_value(item) for item in value.quality_results),
+        "decision": value.decision.value,
+    }
+
+
+def _validate_report_bindings(value: AdmissionReportV2) -> None:
+    baseline_digest = derive_baseline_identity_digest(value.identity)
+    if baseline_digest != derive_baseline_identity_digest(value.measurement.identity):
+        raise AdmissionReportError("measurement baseline identity does not match report")
+    measurement_record_value(value.measurement)
+    for item, field in (
+        (value.census_digest, "census digest"),
+        (value.validation_context_digest, "validation context digest"),
+        (value.authorization_digest, "authorization digest"),
+        (value.label_release_receipt_digest, "label release receipt digest"),
+        (value.case_release_digest, "case release digest"),
+    ):
+        _digest(item, field)
+    if isinstance(value.in_scope_case_count, bool) or not isinstance(value.in_scope_case_count, int):
+        raise AdmissionReportError("in-scope case count must be an integer")
+    if isinstance(value.whole_population_case_count, bool) or not isinstance(value.whole_population_case_count, int):
+        raise AdmissionReportError("whole-population case count must be an integer")
+    if not 0 < value.in_scope_case_count <= value.whole_population_case_count:
+        raise AdmissionReportError("case counts must be positive and in-scope cannot exceed whole-population")
+    _case_digests(value.case_result_digests, value.whole_population_case_count)
+
+
+def _require_exact_gate(value: object, expected: GateResult) -> tuple[GateResult, ...]:
+    if not isinstance(value, tuple) or value != (expected,):
+        raise AdmissionReportError(f"{expected.kind.value} gate does not match its derived evidence and outcome")
+    return value
+
+
+def _derived_gates(value: AdmissionReportV2) -> tuple[GateResult, GateResult, GateResult, GateResult]:
+    cases = tuple(item.case for item in value.budget_evaluations)
+    return (
+        instrument_gate(value.case_result_digests, cases),
+        budget_gate(value.case_result_digests, value.budget_evaluations),
+        readiness_gate(value.measurement.prerequisite_readiness),
+        quality_gate(value.identity, value.measurement, value.quality_evaluations),
+    )
+
+
+def _validate_report_fields(value: AdmissionReportV2) -> None:
+    if type(value) is not AdmissionReportV2:
+        raise AdmissionReportError("report must be an exact AdmissionReportV2")
+    _validate_report_bindings(value)
+    instrument, budget, readiness, quality = _derived_gates(value)
+    actual = (
+        _require_exact_gate(value.instrument_results, instrument),
+        _require_exact_gate(value.budget_results, budget),
+        _require_exact_gate(value.readiness_results, readiness),
+        _require_exact_gate(value.quality_results, quality),
+    )
+    if not isinstance(value.decision, AdmissionDecision):
+        raise AdmissionReportError("decision must use AdmissionDecision")
+    all_passed = all(item.passed for group in actual for item in group)
+    expected = AdmissionDecision.GO if all_passed else AdmissionDecision.NO_GO
+    if value.decision is not expected:
+        raise AdmissionReportError("decision does not match every re-derived mandatory gate")
+
+
+def _validate_report_structure(value: AdmissionReportV2) -> None:
+    _validate_report_fields(value)
+    _digest(value.report_digest, "report digest")
+    if value.report_digest != canonical.content_digest(_report_value(value)):
+        raise AdmissionReportError("report digest does not match admission content")
+
+
+def admission_report_value(value: AdmissionReportV2) -> canonical.JsonValue:
+    _validate_report_structure(value)
+    return _report_value(value)
+
+
+def _readiness_references(readiness: tuple[ReadinessResult, ...]) -> tuple[ReadinessReference, ...]:
+    references = tuple(ReadinessReference(item.stage, item.result, item.result_digest) for item in readiness)
+    if tuple(item.stage for item in references) != _PREREQUISITE_STAGES:
+        raise AdmissionReportError("admission measurement requires instrument through development readiness")
+    return references
+
+
+def _measurement(
+    manifest: AdmissionManifestV2,
+    evidence: AdmissionMetricEvidence,
+    readiness: tuple[ReadinessResult, ...],
+) -> MeasurementRecordV2:
+    return create_measurement_record(
+        identity=manifest.identity,
+        family_decision_vocabulary=evidence.family_decision_vocabulary,
+        family_decision_counts=evidence.family_decision_counts,
+        neutral_outcome_counts=evidence.neutral_outcome_counts,
+        evidence_basis_counts=evidence.evidence_basis_counts,
+        metrics=evidence.metrics,
+        stage_funnel=evidence.stage_funnel,
+        instrument_failures=(),
+        model_outcome_counts=evidence.model_outcome_counts,
+        model_failures=evidence.model_failures,
+        runtime_ms=evidence.runtime_ms,
+        prerequisite_readiness=_readiness_references(readiness),
+    )
+
+
+def _quality_gate(manifest: AdmissionManifestV2, measurement: MeasurementRecordV2) -> GateResult:
+    evaluations = make_threshold_evaluations(manifest.thresholds, measurement)
+    return quality_gate(manifest.identity, measurement, evaluations)
+
+
+def _make_report(
+    manifest: AdmissionManifestV2,
+    preparation: AdmissionPreparation,
+    receipt: PopulationUseReceipt,
+    release: AdmissionCaseRelease,
+    cases: tuple[AdmissionCaseResult, ...],
+    evidence: AdmissionMetricEvidence,
+    measurement: MeasurementRecordV2,
+) -> AdmissionReportV2:
+    budgets = make_budget_evaluations(cases)
+    quality = make_threshold_evaluations(manifest.thresholds, measurement)
+    gates = (
+        instrument_gate(evidence.case_result_digests, cases),
+        budget_gate(evidence.case_result_digests, budgets),
+        readiness_gate(measurement.prerequisite_readiness),
+        quality_gate(manifest.identity, measurement, quality),
+    )
+    decision = AdmissionDecision.GO if all(item.passed for item in gates) else AdmissionDecision.NO_GO
+    values = (
+        manifest.identity,
+        manifest.census.census_digest,
+        preparation.authorization.validation_context_digest,
+        preparation.authorization.authorization_digest,
+        receipt.receipt_digest,
+        release.release_digest,
+        evidence.case_result_digests,
+        evidence.in_scope_case_count,
+        evidence.whole_population_case_count,
+        budgets,
+        quality,
+        measurement,
+        (gates[0],),
+        (gates[1],),
+        (gates[2],),
+        (gates[3],),
+        decision,
+    )
+    draft = object.__new__(AdmissionReportV2)
+    fields = tuple(AdmissionReportV2.__dataclass_fields__)
+    for field, item in zip(fields, (*values, "0" * 64), strict=True):
+        object.__setattr__(draft, field, item)
+    _validate_report_fields(draft)
+    return AdmissionReportV2(*values, canonical.content_digest(_report_value(draft)))
+
+
+def score_admission(
+    manifest: AdmissionManifestV2,
+    denominator: DenominatorPolicy,
+    readiness: Sequence[ReadinessResult],
+    preparation: AdmissionPreparation,
+    label_release_receipt: PopulationUseReceipt,
+    case_release: AdmissionCaseRelease,
+    cases: Sequence[AdmissionCaseResult],
+    context: AdmissionValidationContext,
+    custody: PopulationCustodyPort,
+    resolver: canonical.ContentResolver,
+) -> AdmissionReplay:
+    """Revalidate exact admission evidence and freeze its authoritative replay."""
+    frozen_readiness = tuple(readiness)
+    frozen_cases = tuple(sorted(tuple(cases), key=lambda item: item.case_id_digest))
+    report = _derive_report(
+        manifest,
+        denominator,
+        frozen_readiness,
+        preparation,
+        label_release_receipt,
+        case_release,
+        frozen_cases,
+        context,
+        custody,
+        resolver,
+    )
+    return _make_replay(
+        manifest,
+        denominator,
+        frozen_readiness,
+        preparation,
+        label_release_receipt,
+        case_release,
+        frozen_cases,
+        report,
+    )
+
+
+def _derive_report(
+    manifest: AdmissionManifestV2,
+    denominator: DenominatorPolicy,
+    readiness: tuple[ReadinessResult, ...],
+    preparation: AdmissionPreparation,
+    label_release_receipt: PopulationUseReceipt,
+    case_release: AdmissionCaseRelease,
+    cases: tuple[AdmissionCaseResult, ...],
+    context: AdmissionValidationContext,
+    custody: PopulationCustodyPort,
+    resolver: canonical.ContentResolver,
+) -> AdmissionReportV2:
+    evidence = derive_admission_metrics(
+        manifest,
+        denominator,
+        readiness,
+        preparation,
+        label_release_receipt,
+        case_release,
+        cases,
+        context,
+        custody,
+        resolver,
+    )
+    measurement = _measurement(manifest, evidence, readiness)
+    return _make_report(
+        manifest,
+        preparation,
+        label_release_receipt,
+        case_release,
+        cases,
+        evidence,
+        measurement,
+    )
+
+
+def _make_replay(
+    manifest: AdmissionManifestV2,
+    denominator: DenominatorPolicy,
+    readiness: tuple[ReadinessResult, ...],
+    preparation: AdmissionPreparation,
+    label_release_receipt: PopulationUseReceipt,
+    case_release: AdmissionCaseRelease,
+    cases: tuple[AdmissionCaseResult, ...],
+    report: AdmissionReportV2,
+) -> AdmissionReplay:
+    values = (manifest, denominator, readiness, preparation, label_release_receipt, case_release, cases, report)
+    draft = object.__new__(AdmissionReplay)
+    for field, item in zip(AdmissionReplay.__dataclass_fields__, (*values, "0" * 64), strict=True):
+        object.__setattr__(draft, field, item)
+    return AdmissionReplay(*values, canonical.content_digest(_replay_value(draft)))
+
+
+def validate_admission_replay(
+    replay: AdmissionReplay,
+    context: AdmissionValidationContext,
+    custody: PopulationCustodyPort,
+    resolver: canonical.ContentResolver,
+) -> AdmissionReportV2:
+    """Re-run every carried input against independently supplied current trust state."""
+    validate_admission_replay_structure(replay)
+    try:
+        expected = _derive_report(
+            replay.manifest,
+            replay.denominator,
+            replay.readiness,
+            replay.preparation,
+            replay.label_release_receipt,
+            replay.case_release,
+            replay.cases,
+            context,
+            custody,
+            resolver,
+        )
+    except (AttributeError, LookupError, TypeError, ValueError) as exc:
+        raise AdmissionReportError(f"authoritative admission replay refused: {exc}") from exc
+    actual_bytes = canonical.canonical_bytes(_report_value(replay.report))
+    expected_bytes = canonical.canonical_bytes(_report_value(expected))
+    if replay.report != expected or actual_bytes != expected_bytes:
+        raise AdmissionReportError("report does not match the authoritative admission inputs")
+    expected_replay = _make_replay(
+        replay.manifest,
+        replay.denominator,
+        replay.readiness,
+        replay.preparation,
+        replay.label_release_receipt,
+        replay.case_release,
+        replay.cases,
+        expected,
+    )
+    if replay != expected_replay or canonical.canonical_bytes(_replay_value(replay)) != canonical.canonical_bytes(
+        _replay_value(expected_replay)
+    ):
+        raise AdmissionReportError("replay does not match the authoritative admission inputs")
+    return expected
+
+
+__all__ = [
+    "ADMISSION_REPLAY_SCHEMA",
+    "ADMISSION_REPORT_SCHEMA",
+    "AdmissionReplay",
+    "AdmissionDecision",
+    "AdmissionReportError",
+    "AdmissionReportV2",
+    "CaseBudgetEvaluation",
+    "GateKind",
+    "GateResult",
+    "ThresholdEvaluation",
+    "admission_replay_value",
+    "admission_report_value",
+    "score_admission",
+    "validate_admission_replay",
+]

src/openultrasast/core/measurement_record.py

@@ -20,7 +20,7 @@ from openultrasast.core.readiness import ReadinessEvidenceUse, ReadinessStage, S
 MEASUREMENT_RECORD_SCHEMA = "openultrasast.detection-core.measurement-record.v2"
 REPOSITORY_HOLDOUT_REPORT_SCHEMA = "openultrasast.detection-core.repository-holdout-report.v2"
 _DIGEST = re.compile(r"[0-9a-f]{64}")
-_PREREQUISITE_STAGES = tuple(ReadinessStage)[:5]
+_PREREQUISITE_STAGES = tuple(ReadinessStage)[:6]
 
 
 class MeasurementRecordError(ValueError):

tests/test_core_admission_metrics.py

@@ -405,7 +405,7 @@ def test_supplied_verdict_and_instrument_are_not_trusted() -> None:
         _derive(run, cases=broken_cases, release=_release_for(run, broken_cases))
 
 
-def test_forged_evidence_and_budget_fail_before_metric_production() -> None:
+def test_forged_evidence_fails_but_valid_budget_overrun_reaches_metrics() -> None:
     run = _run(_setup())
     cases = run.setup.cases
     forged_input = replace(cases[0].evidence_inputs[0], input_digest="0" * 64)
@@ -420,8 +420,21 @@ def test_forged_evidence_and_budget_fail_before_metric_production() -> None:
     over_budget = replace(cases[0], total_reply_ms=cases[0].budget.budget_ms + 1)
     over_budget = replace(over_budget, result_digest=derive_admission_case_result_digest(over_budget))
     budget_cases = (over_budget, *cases[1:])
-    with pytest.raises(AdmissionMetricsError, match="budget"):
+    result = _derive(run, cases=budget_cases, release=_release_for(run, budget_cases))
-        _derive(run, cases=budget_cases, release=_release_for(run, budget_cases))
+
+    assert result.runtime_ms == sum(item.total_reply_ms for item in budget_cases)
+
+
+def test_invalid_budget_measurement_still_fails_before_metric_production() -> None:
+    run = _run(_setup())
+    cases = run.setup.cases
+    complexity = replace(cases[0].complexity, changed_bytes=cases[0].complexity.changed_bytes + 1)
+    forged = replace(cases[0], complexity=complexity)
+    forged = replace(forged, result_digest=derive_admission_case_result_digest(forged))
+    forged_cases = (forged, *cases[1:])
+
+    with pytest.raises(AdmissionMetricsError, match="budget validation.*measurement"):
+        _derive(run, cases=forged_cases, release=_release_for(run, forged_cases))
 
 
 def test_runner_case_digest_is_rederived() -> None:

tests/test_core_admission_report.py

@@ -0,0 +1,670 @@
+"""Evidence-backed final admission reports."""
+
+from __future__ import annotations
+
+from collections.abc import Iterator, Sequence
+from dataclasses import replace
+from typing import NamedTuple, TypeVar, overload
+
+import pytest
+from test_core_admission_context import _resign_manifest
+from test_core_admission_metrics import _MetricRun, _MetricSetup, _release_for, _run, _setup, _with_out_of_scope_case
+from test_core_readiness import _chain
+
+from openultrasast.core import _admission_gates as admission_gates_module
+from openultrasast.core import admission_context, canonical, validation
+from openultrasast.core import admission_report as admission_report_module
+from openultrasast.core.admission_case import (
+    AdmissionCaseRelease,
+    AdmissionCaseResult,
+    AdmissionCaseRole,
+    derive_admission_case_result_digest,
+)
+from openultrasast.core.admission_report import (
+    AdmissionDecision,
+    AdmissionReplay,
+    AdmissionReportError,
+    AdmissionReportV2,
+    GateKind,
+    GateResult,
+    admission_replay_value,
+    admission_report_value,
+    score_admission,
+    validate_admission_replay,
+)
+from openultrasast.core.admission_review import AdmissionThreshold, derive_threshold_set_digest
+from openultrasast.core.coverage import ReasonCount
+from openultrasast.core.evidence import EvidenceBasis
+from openultrasast.core.measurement import Comparator, MetricId, Statistic, evaluate_metric
+from openultrasast.core.measurement_factory import create_measurement_record
+from openultrasast.core.readiness import ReadinessResult, ReadinessStage
+
+_T = TypeVar("_T")
+
+
+class _ScoredAdmission(NamedTuple):
+    replay: AdmissionReplay
+    setup: _MetricSetup
+    run: _MetricRun
+    cases: tuple[AdmissionCaseResult, ...]
+    readiness: tuple[ReadinessResult, ...]
+    release: AdmissionCaseRelease
+
+    @property
+    def report(self) -> AdmissionReportV2:
+        return self.replay.report
+
+
+class _SinglePassSequence(Sequence[_T]):
+    def __init__(self, values: tuple[_T, ...]) -> None:
+        self.values = values
+        self.traversals = 0
+
+    def __iter__(self) -> Iterator[_T]:
+        self.traversals += 1
+        if self.traversals > 1:
+            raise AssertionError("caller-controlled sequence traversed twice")
+        return iter(self.values)
+
+    def __len__(self) -> int:
+        return len(self.values)
+
+    @overload
+    def __getitem__(self, index: int) -> _T: ...
+
+    @overload
+    def __getitem__(self, index: slice) -> Sequence[_T]: ...
+
+    def __getitem__(self, index: int | slice) -> _T | Sequence[_T]:
+        return self.values[index]
+
+
+def _without_models(setup: _MetricSetup) -> _MetricSetup:
+    evidence = setup.context.evidence
+    model_lineages = {item.lineage_manifest_digest for item in evidence.model_programs}
+    model_free_evidence = validation.make_evidence_validation_context(
+        family_catalog=evidence.family_catalog,
+        fact_packs=evidence.fact_packs,
+        model_programs=(),
+        lineages=tuple(item for item in evidence.lineages if item.manifest_digest not in model_lineages),
+        fact_review_policy=evidence.fact_review_policy,
+        provenance_trust_policy=evidence.provenance_trust_policy,
+        custody_policy=evidence.custody_policy,
+    )
+    context = admission_context.make_admission_validation_context(
+        evidence=model_free_evidence,
+        admission_review_policy=setup.context.admission_review_policy,
+        proof_trust_policy=setup.context.proof_trust_policy,
+    )
+    identity = replace(
+        setup.manifest.identity,
+        model_program_digests=(),
+        model_program_set_digest=None,
+    )
+    scope = identity.claimed_scopes[0]
+    analysis = admission_context.derive_analysis_identity(identity, evidence.family_catalog, scope, None)
+    readiness = _chain(identity=analysis)[:6]
+    manifest = _resign_manifest(
+        replace(
+            setup.manifest,
+            identity=identity,
+            readiness_digests=tuple(sorted(item.result_digest for item in readiness)),
+            validation_context_digest=context.context_digest,
+        ),
+        setup.manifest.review.conflict_disclosure,
+    )
+    return setup._replace(manifest=manifest, context=context, readiness=readiness)
+
+
+def _score(
+    setup: _MetricSetup,
+    *,
+    cases: Sequence[AdmissionCaseResult] | None = None,
+    readiness: Sequence[ReadinessResult] | None = None,
+) -> AdmissionReportV2:
+    return _score_bundle(setup, cases=cases, readiness=readiness).report
+
+
+def _score_bundle(
+    setup: _MetricSetup,
+    *,
+    cases: Sequence[AdmissionCaseResult] | None = None,
+    readiness: Sequence[ReadinessResult] | None = None,
+) -> _ScoredAdmission:
+    run = _run(setup)
+    selected_cases = tuple(setup.cases if cases is None else cases)
+    selected_readiness = tuple(setup.readiness if readiness is None else readiness)
+    replay = score_admission(
+        setup.manifest,
+        setup.denominator,
+        selected_readiness,
+        run.preparation,
+        run.receipt,
+        run.release,
+        selected_cases,
+        setup.context,
+        setup.custody,
+        setup.resolver,
+    )
+    return _ScoredAdmission(replay, setup, run, replay.cases, replay.readiness, run.release)
+
+
+def _validate_authoritatively(replay: AdmissionReplay, scored: _ScoredAdmission) -> None:
+    validate_admission_replay(
+        replay,
+        scored.setup.context,
+        scored.setup.custody,
+        scored.setup.resolver,
+    )
+
+
+def _rehashed(report: AdmissionReportV2, **changes: object) -> AdmissionReportV2:
+    draft = object.__new__(AdmissionReportV2)
+    for field in AdmissionReportV2.__dataclass_fields__:
+        object.__setattr__(draft, field, changes.get(field, getattr(report, field)))
+    object.__setattr__(draft, "report_digest", "0" * 64)
+    digest = canonical.content_digest(admission_report_module._report_value(draft))
+    object.__setattr__(draft, "report_digest", digest)
+    return draft
+
+
+def _rehashed_replay(replay: AdmissionReplay, **changes: object) -> AdmissionReplay:
+    draft = object.__new__(AdmissionReplay)
+    for field in AdmissionReplay.__dataclass_fields__:
+        object.__setattr__(draft, field, changes.get(field, getattr(replay, field)))
+    object.__setattr__(draft, "replay_digest", "0" * 64)
+    digest = canonical.content_digest(admission_report_module._replay_value(draft))
+    object.__setattr__(draft, "replay_digest", digest)
+    return draft
+
+
+def _mutated(value: _T, **changes: object) -> _T:
+    draft = object.__new__(type(value))
+    for field in value.__dataclass_fields__:  # type: ignore[attr-defined]
+        object.__setattr__(draft, field, changes.get(field, getattr(value, field)))
+    return draft
+
+
+def _failed_quality_bundle() -> _ScoredAdmission:
+    setup = _setup()
+    vulnerable, fixed, ordinary = setup.cases
+    vulnerable = replace(vulnerable, role=AdmissionCaseRole.FIXED, result_digest="0" * 64)
+    vulnerable = replace(vulnerable, result_digest=derive_admission_case_result_digest(vulnerable))
+    fixed = replace(fixed, role=AdmissionCaseRole.VULNERABLE, result_digest="0" * 64)
+    fixed = replace(fixed, result_digest=derive_admission_case_result_digest(fixed))
+    cases = (vulnerable, fixed, ordinary)
+    run = _run(setup)
+    release = _release_for(run, cases)
+    replay = score_admission(
+        setup.manifest,
+        setup.denominator,
+        setup.readiness,
+        run.preparation,
+        run.receipt,
+        release,
+        cases,
+        setup.context,
+        setup.custody,
+        setup.resolver,
+    )
+    return _ScoredAdmission(replay, setup, run, replay.cases, replay.readiness, release)
+
+
+def _failed_quality_report() -> AdmissionReportV2:
+    return _failed_quality_bundle().report
+
+
+def test_complete_admission_is_reproducible_and_bound_to_exact_evidence() -> None:
+    setup = _without_models(_setup())
+    run = _run(setup)
+
+    first = score_admission(
+        setup.manifest,
+        setup.denominator,
+        setup.readiness,
+        run.preparation,
+        run.receipt,
+        run.release,
+        setup.cases,
+        setup.context,
+        setup.custody,
+        setup.resolver,
+    )
+    second = _score_bundle(_without_models(_setup())).replay
+
+    assert first == second
+    assert canonical.canonical_bytes(admission_replay_value(first)) == canonical.canonical_bytes(admission_replay_value(second))
+    assert first.replay_digest == canonical.content_digest(admission_replay_value(first))
+    report = first.report
+    assert report.decision is AdmissionDecision.GO
+    assert report.report_digest == canonical.content_digest(admission_report_value(report))
+    assert report.census_digest == setup.manifest.census.census_digest
+    assert report.validation_context_digest == setup.context.context_digest
+    assert report.authorization_digest == run.preparation.authorization.authorization_digest
+    assert report.label_release_receipt_digest == run.receipt.receipt_digest
+    assert report.case_release_digest == run.release.release_digest
+    assert report.case_result_digests == tuple(sorted(case.result_digest for case in setup.cases))
+    assert tuple(item.basis for item in report.measurement.evidence_basis_counts) == tuple(EvidenceBasis)
+    assert tuple(item.kind for item in report.instrument_results) == (GateKind.INSTRUMENT,)
+    assert tuple(item.kind for item in report.budget_results) == (GateKind.BUDGET,)
+    assert tuple(item.kind for item in report.readiness_results) == (GateKind.READINESS,)
+    assert tuple(item.kind for item in report.quality_results) == (GateKind.QUALITY,)
+    assert all(
+        gate.passed
+        for group in (
+            report.instrument_results,
+            report.budget_results,
+            report.readiness_results,
+        )
+        for gate in group
+    )
+
+
+def test_score_snapshots_caller_sequences_once_and_records_development_readiness() -> None:
+    setup = _setup()
+    cases = _SinglePassSequence(setup.cases)
+    readiness = _SinglePassSequence(setup.readiness)
+
+    report = _score(setup, cases=cases, readiness=readiness)
+
+    assert (cases.traversals, readiness.traversals) == (1, 1)
+    assert tuple(item.stage for item in report.measurement.prerequisite_readiness) == tuple(ReadinessStage)[:6]
+
+
+def test_score_canonicalizes_case_permutations_after_one_sequence_traversal() -> None:
+    setup = _setup()
+    run = _run(setup)
+    cases = _SinglePassSequence(tuple(reversed(setup.cases)))
+
+    replay = score_admission(
+        setup.manifest,
+        setup.denominator,
+        setup.readiness,
+        run.preparation,
+        run.receipt,
+        run.release,
+        cases,
+        setup.context,
+        setup.custody,
+        setup.resolver,
+    )
+    canonical_replay = _score_bundle(_setup()).replay
+
+    assert cases.traversals == 1
+    assert replay == canonical_replay
+    assert replay.replay_digest == canonical_replay.replay_digest
+    assert tuple(item.case_id_digest for item in replay.cases) == tuple(sorted(item.case_id_digest for item in setup.cases))
+
+
+def test_contextual_validator_snapshots_caller_sequences_once() -> None:
+    scored = _score_bundle(_setup())
+    cases = _SinglePassSequence(scored.cases)
+    readiness = _SinglePassSequence(scored.readiness)
+
+    replay = _rehashed_replay(scored.replay, readiness=tuple(readiness), cases=tuple(cases))
+    validate_admission_replay(
+        replay,
+        scored.setup.context,
+        scored.setup.custody,
+        scored.setup.resolver,
+    )
+
+    assert (cases.traversals, readiness.traversals) == (1, 1)
+
+
+def test_raw_report_is_not_an_authorization_replay() -> None:
+    scored = _score_bundle(_setup())
+
+    with pytest.raises(AdmissionReportError, match="exact AdmissionReplay"):
+        validate_admission_replay(  # type: ignore[arg-type]
+            scored.report,
+            scored.setup.context,
+            scored.setup.custody,
+            scored.setup.resolver,
+        )
+
+
+def test_rehashed_replay_cannot_substitute_readiness_order() -> None:
+    scored = _score_bundle(_setup())
+    forged = _rehashed_replay(scored.replay, readiness=tuple(reversed(scored.readiness)))
+
+    with pytest.raises(AdmissionReportError, match="readiness"):
+        _validate_authoritatively(forged, scored)
+
+
+def test_replay_digest_mutation_is_refused_before_authoritative_replay() -> None:
+    replay = _score_bundle(_setup()).replay
+
+    with pytest.raises(AdmissionReportError, match="replay digest"):
+        replace(replay, replay_digest=canonical.content_digest("forged-replay"))
+
+
+def test_rehashed_replay_cannot_substitute_a_case_payload() -> None:
+    scored = _score_bundle(_setup())
+    original = scored.replay.cases[0]
+    changed = replace(original, total_reply_ms=original.total_reply_ms + 1, result_digest="0" * 64)
+    changed = replace(changed, result_digest=derive_admission_case_result_digest(changed))
+    cases = tuple(sorted((changed, *scored.replay.cases[1:]), key=lambda item: item.case_id_digest))
+    forged = _rehashed_replay(scored.replay, cases=cases)
+
+    with pytest.raises(AdmissionReportError, match="case|release|binding"):
+        _validate_authoritatively(forged, scored)
+
+
+def test_failed_registered_quality_threshold_is_a_valid_no_go_report() -> None:
+    report = _failed_quality_report()
+
+    recall = next(item for item in report.measurement.metrics if item.metric_id is MetricId.VULNERABLE_RECALL)
+    assert recall.numerator == 0
+    assert report.decision is AdmissionDecision.NO_GO
+    assert report.quality_results[0].passed is False
+    assert "threshold_failed:vulnerable_recall:count" in report.quality_results[0].reasons
+
+
+def test_validated_budget_overrun_produces_failed_gate_and_no_go() -> None:
+    setup = _setup()
+    run = _run(setup)
+    original = setup.cases[0]
+    changed = replace(original, total_reply_ms=original.budget.budget_ms + 1, result_digest="0" * 64)
+    changed = replace(changed, result_digest=derive_admission_case_result_digest(changed))
+    cases = tuple(sorted((changed, *setup.cases[1:]), key=lambda item: item.case_id_digest))
+    release = _release_for(run, cases)
+
+    replay = score_admission(
+        setup.manifest,
+        setup.denominator,
+        setup.readiness,
+        run.preparation,
+        run.receipt,
+        release,
+        cases,
+        setup.context,
+        setup.custody,
+        setup.resolver,
+    )
+
+    report = replay.report
+    assert report.decision is AdmissionDecision.NO_GO
+    assert not report.budget_results[0].passed
+    assert report.budget_results[0].reasons == (f"budget_exceeded:{changed.result_digest}",)
+    assert validate_admission_replay(replay, setup.context, setup.custody, setup.resolver) == report
+
+
+def test_no_go_cannot_be_replaced_by_go_or_lose_a_mandatory_gate() -> None:
+    report = _score(_setup())
+    with pytest.raises(AdmissionReportError, match="quality gate"):
+        replace(report, quality_results=(), report_digest="0" * 64)
+    with pytest.raises(AdmissionReportError, match="report digest"):
+        replace(report, report_digest=canonical.content_digest("forged"))
+
+
+def test_configured_model_with_zero_calls_is_canonical_null_and_no_go() -> None:
+    scored = _score_bundle(_setup())
+    report = scored.report
+    model = next(item for item in report.measurement.metrics if item.metric_id is MetricId.MODEL_SUCCESS_RATE)
+
+    assert (model.numerator, model.denominator, model.value) == (0, 0, None)
+    assert report.decision is AdmissionDecision.NO_GO
+    assert "mandatory_model_success_threshold_missing" in report.quality_results[0].reasons
+    assert "mandatory_model_success_has_no_attempted_calls" in report.quality_results[0].reasons
+    _validate_authoritatively(scored.replay, scored)
+
+
+def test_rehashed_failed_quality_gate_cannot_be_promoted_to_go() -> None:
+    scored = _failed_quality_bundle()
+    report = scored.report
+    forged_gate = replace(report.quality_results[0], passed=True, reasons=())
+    forged = _rehashed(report, quality_results=(forged_gate,), decision=AdmissionDecision.GO)
+
+    with pytest.raises(AdmissionReportError, match="quality gate"):
+        _validate_authoritatively(_rehashed_replay(scored.replay, report=forged), scored)
+
+
+@pytest.mark.parametrize("category", ("instrument", "budget", "readiness"))
+def test_rehashed_gate_evidence_substitution_is_refused(category: str) -> None:
+    scored = _score_bundle(_setup())
+    report = scored.report
+    field = f"{category}_results"
+    gate = getattr(report, field)[0]
+    forged_gate = replace(gate, evidence_digests=(canonical.content_digest(f"forged:{category}"),))
+    forged = _rehashed(report, **{field: (forged_gate,)})
+
+    with pytest.raises(AdmissionReportError, match=rf"{category} gate"):
+        _validate_authoritatively(_rehashed_replay(scored.replay, report=forged), scored)
+
+
+def test_rehashed_measurement_readiness_divergence_is_refused() -> None:
+    scored = _score_bundle(_setup())
+    report = scored.report
+    measurement = report.measurement
+    changed_reference = replace(
+        measurement.prerequisite_readiness[0],
+        result_digest=canonical.content_digest("different-readiness-result"),
+    )
+    changed_measurement = create_measurement_record(
+        identity=measurement.identity,
+        family_decision_vocabulary=measurement.family_decision_vocabulary,
+        family_decision_counts=measurement.family_decision_counts,
+        neutral_outcome_counts=measurement.neutral_outcome_counts,
+        evidence_basis_counts=measurement.evidence_basis_counts,
+        metrics=measurement.metrics,
+        stage_funnel=measurement.stage_funnel,
+        instrument_failures=measurement.instrument_failures,
+        model_outcome_counts=measurement.model_outcome_counts,
+        model_failures=measurement.model_failures,
+        runtime_ms=measurement.runtime_ms,
+        prerequisite_readiness=(changed_reference, *measurement.prerequisite_readiness[1:]),
+    )
+    evaluations = tuple(_mutated(item, measurement_record_digest=changed_measurement.record_digest) for item in report.quality_evaluations)
+    evaluations = tuple(
+        _mutated(
+            item,
+            evaluation_digest=canonical.content_digest(admission_gates_module.threshold_evaluation_value(item)),
+        )
+        for item in evaluations
+    )
+    quality = admission_gates_module.quality_gate(report.identity, changed_measurement, evaluations)
+    forged = _rehashed(
+        report,
+        measurement=changed_measurement,
+        quality_evaluations=evaluations,
+        quality_results=(quality,),
+    )
+
+    with pytest.raises(AdmissionReportError, match="readiness gate"):
+        _validate_authoritatively(_rehashed_replay(scored.replay, report=forged), scored)
+
+
+def test_rehashed_threshold_evaluation_mutations_are_refused() -> None:
+    scored = _score_bundle(_setup())
+    report = scored.report
+    evaluations = report.quality_evaluations
+    changed = _mutated(evaluations[0], target=evaluations[0].target + 0.25)
+    changed = _mutated(
+        changed,
+        evaluation_digest=canonical.content_digest(admission_gates_module.threshold_evaluation_value(changed)),
+    )
+
+    for forged_evaluations in ((), (evaluations[0], evaluations[0]), (changed,)):
+        forged = _rehashed(report, quality_evaluations=forged_evaluations)
+        with pytest.raises(AdmissionReportError, match="threshold|quality"):
+            _validate_authoritatively(_rehashed_replay(scored.replay, report=forged), scored)
+
+
+def test_rehashed_typed_case_budget_substitution_is_refused() -> None:
+    scored = _score_bundle(_setup())
+    report = scored.report
+    original = report.budget_evaluations[0]
+    changed = _mutated(original, budget_derivation_digest=canonical.content_digest("forged-budget"))
+    changed = _mutated(
+        changed,
+        evaluation_digest=canonical.content_digest(admission_gates_module.budget_evaluation_value(changed)),
+    )
+    forged = _rehashed(report, budget_evaluations=(changed, *report.budget_evaluations[1:]))
+
+    with pytest.raises(AdmissionReportError, match="budget evaluation"):
+        _validate_authoritatively(_rehashed_replay(scored.replay, report=forged), scored)
+
+
+def test_contextual_validation_refuses_coordinated_threshold_rehash() -> None:
+    scored = _failed_quality_bundle()
+    report = scored.report
+    threshold = AdmissionThreshold(MetricId.VULNERABLE_RECALL, Statistic.COUNT, Comparator.AT_LEAST, 0.0)
+    threshold_digest = derive_threshold_set_digest((threshold,))
+    identity = replace(
+        report.identity,
+        model_program_digests=(),
+        model_program_set_digest=None,
+        threshold_set_digest=threshold_digest,
+    )
+    measurement = create_measurement_record(
+        identity=identity,
+        family_decision_vocabulary=report.measurement.family_decision_vocabulary,
+        family_decision_counts=report.measurement.family_decision_counts,
+        neutral_outcome_counts=report.measurement.neutral_outcome_counts,
+        evidence_basis_counts=report.measurement.evidence_basis_counts,
+        metrics=report.measurement.metrics,
+        stage_funnel=report.measurement.stage_funnel,
+        instrument_failures=report.measurement.instrument_failures,
+        model_outcome_counts=report.measurement.model_outcome_counts,
+        model_failures=report.measurement.model_failures,
+        runtime_ms=report.measurement.runtime_ms,
+        prerequisite_readiness=report.measurement.prerequisite_readiness,
+    )
+    evaluations = admission_gates_module.make_threshold_evaluations((threshold,), measurement)
+    quality = admission_gates_module.quality_gate(identity, measurement, evaluations)
+    forged = _rehashed(
+        report,
+        identity=identity,
+        measurement=measurement,
+        quality_evaluations=evaluations,
+        quality_results=(quality,),
+        decision=AdmissionDecision.GO,
+    )
+
+    admission_report_module._validate_report_structure(forged)
+    assert forged.authorization_digest == report.authorization_digest
+    with pytest.raises(AdmissionReportError, match="authoritative admission inputs"):
+        _validate_authoritatively(_rehashed_replay(scored.replay, report=forged), scored)
+
+
+def test_contextual_validation_refuses_coordinated_readiness_rehash() -> None:
+    scored = _score_bundle(_setup())
+    report = scored.report
+    references = tuple(
+        replace(item, result_digest=canonical.content_digest(f"forged-readiness:{item.stage.value}"))
+        for item in report.measurement.prerequisite_readiness
+    )
+    measurement = create_measurement_record(
+        identity=report.identity,
+        family_decision_vocabulary=report.measurement.family_decision_vocabulary,
+        family_decision_counts=report.measurement.family_decision_counts,
+        neutral_outcome_counts=report.measurement.neutral_outcome_counts,
+        evidence_basis_counts=report.measurement.evidence_basis_counts,
+        metrics=report.measurement.metrics,
+        stage_funnel=report.measurement.stage_funnel,
+        instrument_failures=report.measurement.instrument_failures,
+        model_outcome_counts=report.measurement.model_outcome_counts,
+        model_failures=report.measurement.model_failures,
+        runtime_ms=report.measurement.runtime_ms,
+        prerequisite_readiness=references,
+    )
+    thresholds = tuple(
+        AdmissionThreshold(item.metric_id, item.statistic, item.comparator, item.target) for item in report.quality_evaluations
+    )
+    evaluations = admission_gates_module.make_threshold_evaluations(thresholds, measurement)
+    quality = admission_gates_module.quality_gate(report.identity, measurement, evaluations)
+    readiness = admission_gates_module.readiness_gate(references)
+    forged = _rehashed(
+        report,
+        measurement=measurement,
+        quality_evaluations=evaluations,
+        quality_results=(quality,),
+        readiness_results=(readiness,),
+    )
+
+    admission_report_module._validate_report_structure(forged)
+    with pytest.raises(AdmissionReportError, match="authoritative admission inputs"):
+        _validate_authoritatively(_rehashed_replay(scored.replay, report=forged), scored)
+
+
+def test_out_of_scope_only_model_capacity_does_not_enter_claimed_scope_metric() -> None:
+    setup = _with_out_of_scope_case(_setup())
+    report = _score(setup)
+    claimed = set(setup.manifest.identity.claimed_scopes)
+    rows = tuple(replace(row, model_call_capacity=1) if row.scope not in claimed else row for row in setup.manifest.census.rows)
+    changed_manifest = replace(setup.manifest, census=replace(setup.manifest.census, rows=rows))
+
+    gate = admission_report_module._quality_gate(changed_manifest, report.measurement)
+    model = next(item for item in report.measurement.metrics if item.metric_id is MetricId.MODEL_SUCCESS_RATE)
+
+    assert (model.numerator, model.denominator) == (0, 0)
+    assert not gate.passed
+    assert report.decision is AdmissionDecision.NO_GO
+
+
+def _model_quality_gate(
+    *,
+    numerator: int,
+    denominator: int = 1,
+    thresholds: tuple[AdmissionThreshold, ...],
+) -> GateResult:
+    setup = _setup()
+    report = _score(setup)
+    identity = replace(report.identity, threshold_set_digest=derive_threshold_set_digest(thresholds))
+    rule = next(item for item in setup.denominator.rules if item.metric_id is MetricId.MODEL_SUCCESS_RATE)
+    model_metric = evaluate_metric(rule, numerator=numerator, denominator=denominator)
+    metrics = tuple(model_metric if item.metric_id is MetricId.MODEL_SUCCESS_RATE else item for item in report.measurement.metrics)
+    model_outcomes = tuple(
+        ReasonCount(name, count) for name, count in (("failure", denominator - numerator), ("success", numerator)) if count
+    )
+    measurement = create_measurement_record(
+        identity=identity,
+        family_decision_vocabulary=report.measurement.family_decision_vocabulary,
+        family_decision_counts=report.measurement.family_decision_counts,
+        neutral_outcome_counts=report.measurement.neutral_outcome_counts,
+        evidence_basis_counts=report.measurement.evidence_basis_counts,
+        metrics=metrics,
+        stage_funnel=report.measurement.stage_funnel,
+        instrument_failures=report.measurement.instrument_failures,
+        model_outcome_counts=model_outcomes,
+        model_failures=() if numerator == denominator else ("provider_timeout",),
+        runtime_ms=report.measurement.runtime_ms,
+        prerequisite_readiness=report.measurement.prerequisite_readiness,
+    )
+    evaluations = admission_gates_module.make_threshold_evaluations(thresholds, measurement)
+    return admission_gates_module.quality_gate(identity, measurement, evaluations)
+
+
+def test_applicable_passing_model_requires_and_passes_registered_threshold() -> None:
+    base = _setup().manifest.thresholds[0]
+    model = AdmissionThreshold(MetricId.MODEL_SUCCESS_RATE, Statistic.COUNT, Comparator.AT_LEAST, 1.0)
+    thresholds = tuple(sorted((base, model), key=lambda item: (item.metric_id.value, item.statistic.value)))
+
+    gate = _model_quality_gate(numerator=1, thresholds=thresholds)
+
+    assert gate.passed
+
+
+def test_applicable_failed_model_or_missing_model_threshold_cannot_go() -> None:
+    base = _setup().manifest.thresholds[0]
+    missing = _model_quality_gate(numerator=0, thresholds=(base,))
+    model = AdmissionThreshold(MetricId.MODEL_SUCCESS_RATE, Statistic.COUNT, Comparator.AT_LEAST, 1.0)
+    thresholds = tuple(sorted((base, model), key=lambda item: (item.metric_id.value, item.statistic.value)))
+    failed = _model_quality_gate(numerator=0, thresholds=thresholds)
+
+    assert not missing.passed
+    assert "mandatory_model_success_threshold_missing" in missing.reasons
+    assert not failed.passed
+    assert "mandatory_model_call_failed" in failed.reasons
+
+
+def test_any_failed_declared_model_call_forces_no_go_even_when_threshold_passes() -> None:
+    base = _setup().manifest.thresholds[0]
+    model = AdmissionThreshold(MetricId.MODEL_SUCCESS_RATE, Statistic.COUNT, Comparator.AT_LEAST, 1.0)
+    thresholds = tuple(sorted((base, model), key=lambda item: (item.metric_id.value, item.statistic.value)))
+
+    gate = _model_quality_gate(numerator=1, denominator=2, thresholds=thresholds)
+
+    assert not gate.passed
+    assert "mandatory_model_call_failed" in gate.reasons

tests/test_core_measurement_record.py

@@ -54,7 +54,7 @@ def _funnel(*, inputs_read: int = 1, findings: int = 1) -> CoverageFunnel:
 
 def _readiness(*, result: StageResult = StageResult.PASSED) -> tuple[ReadinessReference, ...]:
     return tuple(
-        ReadinessReference(stage, result, _digest(f"readiness:{stage.value}:{result.value}")) for stage in tuple(ReadinessStage)[:5]
+        ReadinessReference(stage, result, _digest(f"readiness:{stage.value}:{result.value}")) for stage in tuple(ReadinessStage)[:6]
     )
 
 
@@ -163,7 +163,7 @@ def test_decision_vocabulary_counts_and_funnel_totals_must_agree() -> None:
 
 def test_later_measurement_carries_canonical_prerequisite_results_and_digests() -> None:
     record = _record()
-    assert tuple(item.stage for item in record.prerequisite_readiness) == tuple(ReadinessStage)[:5]
+    assert tuple(item.stage for item in record.prerequisite_readiness) == tuple(ReadinessStage)[:6]
     with pytest.raises(MeasurementRecordError, match="prerequisite readiness"):
         replace(record, prerequisite_readiness=record.prerequisite_readiness[:-1], record_digest="")
     with pytest.raises(MeasurementRecordError, match="readiness digest"):