diff --git a/scripts/compare-native-ingestion-browser.ts b/scripts/compare-native-ingestion-browser.ts
index 53fbb6ff03d..f9e3f206586 100644
--- a/scripts/compare-native-ingestion-browser.ts
+++ b/scripts/compare-native-ingestion-browser.ts
@@ -107,6 +107,10 @@ const workloads = [
 ];
 const names = workloads.map(item => item.name);
 const median = (values: number[]) => [...values].sort((a, b) => a - b)[Math.floor(values.length / 2)]!;
+const pooledMedian = (values: number[]) => {
+  const sorted = [...values].sort((a, b) => a - b), middle = Math.floor(sorted.length / 2);
+  return sorted.length % 2 ? sorted[middle]! : (sorted[middle - 1]! + sorted[middle]!) / 2;
+};
 const first = pairs[0];
 const sha256 = (value: unknown) => typeof value === "string" && /^[a-f0-9]{64}$/.test(value);
 const uuid = (value: unknown) => typeof value === "string" && /^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i.test(value);
@@ -463,27 +467,112 @@ if (h5 && phase === "compare" && candidatePolicy === "final-b2") {
   }
 }
 const metric = (item: any, key: string): number => key.split(".").reduce((value, part) => value[part], item);
+// Prospective main-campaign rule. The 2ms floor is timestamp contrast
+// representation only: it never pads observed noise or a regression gate.
+const browserAaRule = Object.freeze({ pairCount: 5, pairedFraction: 0.20, medianDriftFraction: 0.10,
+  contrastRepresentationFloorMs: 2, representationLimitedMedianMs: 20 });
+function assertArmChronology(rows: any[]) {
+  assert.equal(rows?.length, 10, "Browser A/A/comparison requires ten actual owning invocations");
+  const sorted = [...rows].sort((a,b) => a.startedAtMs - b.startedAtMs);
+  const companies = new Set(), runIds = new Set(), owners = new Set();
+  for (const [index, row] of sorted.entries()) {
+    assert.ok(Number.isSafeInteger(row.startedAtMs) && row.startedAtMs > 0 && Number.isFinite(row.durationMs)
+      && row.durationMs > 0, "Missing finite actual owning timestamp/duration");
+    assert.equal(row.finishedAtMs, row.startedAtMs + row.durationMs);
+    if (index) assert.ok(sorted[index - 1].finishedAtMs <= row.startedAtMs, "Browser owning invocations overlap");
+    assert.ok(sha256(row.ownerReportSha256) && !owners.has(row.ownerReportSha256), "Reused owning report"); owners.add(row.ownerReportSha256);
+    assert.ok(uuid(row.companyId) && !companies.has(row.companyId), "Each browser arm needs its fresh owned company"); companies.add(row.companyId);
+    assert.ok(Array.isArray(row.runIds) && row.runIds.length > 0);
+    for (const runId of row.runIds) {
+      assert.ok(uuid(runId) && !runIds.has(runId), "Browser arms reuse an owned run"); runIds.add(runId);
+    }
+    const pairIndex = Math.floor(index / 2), firstArm = pairIndex % 2 ? "candidate" : "baseline";
+    assert.equal(row.pairIndex, pairIndex, "Owner chronology must match registered pair order");
+    assert.equal(row.arm, index % 2 ? firstArm === "baseline" ? "candidate" : "baseline" : firstArm,
+      "Browser pairs must alternate baseline-first then candidate-first");
+  }
+  return sorted;
+}
+const armChronology = h5 ? assertArmChronology(pairs.flatMap((pair, pairIndex) => (["baseline", "candidate"] as const).map(arm => {
+  const report = pair[arm], owner = report.owningPlaywright, startedAtMs = Date.parse(owner.startedAt);
+  return { pairIndex, arm, startedAtMs, durationMs: owner.durationMs, finishedAtMs: startedAtMs + owner.durationMs,
+    ownerReportSha256: owner.reportSha256, companyId: report.companyId, runIds: report.cases.flatMap((item: any) => item.runIds) };
+}))) : undefined;
+function assessAaMetric(samples: any[], chronology: any[]) {
+  assert.equal(samples.length, 5);
+  for (const sample of samples) {
+    assert.ok(Number.isFinite(sample.baseline) && sample.baseline > 0 && Number.isFinite(sample.candidate) && sample.candidate >= 0);
+    assert.equal(sample.improvementMs, sample.baseline - sample.candidate, "A/A paired absolute contrast was forged");
+    assert.equal(sample.improvementRelative, sample.improvementMs / sample.baseline, "A/A paired relative contrast was forged");
+  }
+  const pairedDifferencesMs = samples.map(sample => Math.abs(sample.improvementMs));
+  const pairedLimitsMs = samples.map(sample => Math.max(browserAaRule.pairedFraction * sample.baseline, browserAaRule.contrastRepresentationFloorMs));
+  const baselineMedianMs = median(samples.map(sample => sample.baseline)), candidateMedianMs = median(samples.map(sample => sample.candidate));
+  const chronologicalValues = chronology.map(row => samples[row.pairIndex][row.arm]);
+  const firstFiveMedianMs = median(chronologicalValues.slice(0,5)), lastFiveMedianMs = median(chronologicalValues.slice(5));
+  const chronologicalMedianDriftMs = Math.abs(lastFiveMedianMs - firstFiveMedianMs);
+  const chronologicalDriftLimitMs = Math.max(browserAaRule.medianDriftFraction * firstFiveMedianMs, browserAaRule.contrastRepresentationFloorMs);
+  const roleMedianDriftMs = Math.abs(candidateMedianMs - baselineMedianMs);
+  const roleDriftLimitMs = Math.max(browserAaRule.medianDriftFraction * baselineMedianMs, browserAaRule.contrastRepresentationFloorMs);
+  const pooledMedianMs = pooledMedian(samples.flatMap(sample => [sample.baseline, sample.candidate]));
+  return { sampleCount: 10, pairCount: 5, pairedDifferencesMs, pairedLimitsMs, baselineMedianMs, candidateMedianMs,
+    pooledMedianMs, firstFiveMedianMs, lastFiveMedianMs, chronologicalMedianDriftMs, chronologicalDriftLimitMs,
+    roleMedianDriftMs, roleDriftLimitMs, representationLimited: pooledMedianMs <= browserAaRule.representationLimitedMedianMs,
+    observedNoiseAbsoluteMs: Math.max(...pairedDifferencesMs),
+    observedNoiseRelative: Math.max(...samples.map(sample => Math.abs(sample.improvementRelative))),
+    passed: pairedDifferencesMs.every((value,index) => value <= pairedLimitsMs[index])
+      && chronologicalMedianDriftMs <= chronologicalDriftLimitMs && roleMedianDriftMs <= roleDriftLimitMs };
+}
 const measurements = names.flatMap(name => {
   const observed = first.baseline.cases.find((item: any) => item.name === name);
   const keys = ["firstVisibleAfterEmissionMs", "emissionToVisible.medianMs", "drainThroughTerminalMs",
     ...(name === "paced" ? ["interChunkGaps.maxMs"] : []),
     ...(observed.emissionToVisible.p95Ms === undefined ? [] : ["emissionToVisible.p95Ms", "intendedToVisible.p95Ms"]),
-    ...(observed.stop ? ["stopThroughTerminalMs", "stopThroughAcknowledgementMs"] : [])];
+    ...(observed.stop ? ["stopThroughTerminalMs", "stopThroughAcknowledgementMs"] : []),
+    ...(h5 && !observed.stop ? ["h5.independentDrain.elapsedFromEpochMs"] : [])];
   return keys.map(key => {
     const samples = pairs.map(pair => {
       const baseline = metric(pair.baseline.cases.find((item: any) => item.name === name), key);
       const candidate = metric(pair.candidate.cases.find((item: any) => item.name === name), key);
       assert.ok(Number.isFinite(baseline) && baseline > 0 && Number.isFinite(candidate) && candidate >= 0, `Invalid latency ${name}.${key}`);
-      return { baseline, candidate, improvementRelative: (baseline - candidate) / baseline };
+      return { baseline, candidate, improvementMs: baseline - candidate, improvementRelative: (baseline - candidate) / baseline };
     });
+    const pooledMedianMs = pooledMedian(samples.flatMap(sample => [sample.baseline, sample.candidate]));
+    const representationLimited = h5 && pooledMedianMs <= browserAaRule.representationLimitedMedianMs;
+    const aaSuitability = h5 && phase === "aa" ? assessAaMetric(samples, armChronology!) : undefined;
     return { name, metric: key, baselineMedianMs: median(samples.map(sample => sample.baseline)),
       candidateMedianMs: median(samples.map(sample => sample.candidate)),
-      medianPairedImprovementRelative: median(samples.map(sample => sample.improvementRelative)),
+      medianPairedImprovementRelative: representationLimited ? null : median(samples.map(sample => sample.improvementRelative)),
+      ...(h5 ? { pooledMedianMs, representationLimited, percentageGainClaimAllowed: !representationLimited,
+        sub2msOrP99GainClaimAllowed: false, medianPairedImprovementMs: median(samples.map(sample => sample.improvementMs)),
+        aaSuitability } : {}),
       candidateWins: samples.filter(sample => sample.improvementRelative > 0).length,
       aaNoiseEnvelopeRelative: phase === "aa" ? Math.max(...samples.map(sample => Math.abs(sample.improvementRelative))) : undefined,
+      ...(h5 ? { aaNoiseEnvelopeAbsoluteMs: phase === "aa" ? Math.max(...samples.map(sample => Math.abs(sample.improvementMs))) : undefined } : {}),
       samples };
   });
 });
+// A descriptive rate from the independently verified completion upper bound.
+// Gate duration against its own A/A noise; invent no separate rate threshold.
+const verifiedCompletionRates = h5 ? names.filter(name => !first.baseline.cases.find((item: any) => item.name === name).stop).map(name => {
+  const samples = pairs.map(pair => {
+    const baseline = pair.baseline.cases.find((item: any) => item.name === name);
+    const candidate = pair.candidate.cases.find((item: any) => item.name === name);
+    const counts = [baseline, candidate].map(item => item.h5.independentDrain.deltaCount);
+    assert.equal(counts[0], counts[1], "Verified completion rates require equal matched measured-delta counts");
+    assert.ok([baseline, candidate].every(item => item.h5.independentDrain.elapsedFromEpochMs > 0),
+      "Verified completion rate needs positive observed duration");
+    return { measuredDeltas: counts[0], baselineElapsedMs: baseline.h5.independentDrain.elapsedFromEpochMs,
+      candidateElapsedMs: candidate.h5.independentDrain.elapsedFromEpochMs,
+      baselineDeltasPerSecond: 1000 * counts[0] / baseline.h5.independentDrain.elapsedFromEpochMs,
+      candidateDeltasPerSecond: 1000 * counts[1] / candidate.h5.independentDrain.elapsedFromEpochMs };
+  });
+  return { name, sampleCount: samples.length, samples,
+    baselineMedianDeltasPerSecond: median(samples.map(sample => sample.baselineDeltasPerSecond)),
+    candidateMedianDeltasPerSecond: median(samples.map(sample => sample.candidateDeltasPerSecond)),
+    gatedDurationMetric: "h5.independentDrain.elapsedFromEpochMs",
+    scope: "Matched measured normalized deltas / independently verified completion upper bound; includes oracle, reload, screenshot, API and lease verification; not exact last-commit throughput" };
+}) : undefined;
 const retryObservations = names.map(name => {
   const samples = pairs.map(pair => Object.fromEntries((["baseline", "candidate"] as const).map(arm => {
     const item = pair[arm].cases.find((value: any) => value.name === name);
@@ -525,6 +614,9 @@ const result: Record<string, any> = {
   comparatorSha256: createHash("sha256").update(await readFile(new URL(import.meta.url))).digest("hex"),
   manifestSha256: createHash("sha256").update(await readFile(manifestPath)).digest("hex"), measurements,
   primaryLoadedWorkload: "burst512", complete: true, retryObservations,
+  ...(h5 ? { verifiedCompletionRates, armChronology,
+    ...(phase === "aa" ? { aaSuitability: { rule: browserAaRule, metricCount: measurements.length,
+      passed: measurements.every(item => item.aaSuitability?.passed) } } : {}) } : {}),
   ...(h5 ? { observationMode: H5_MODE, workloadSha256: H5_WORKLOAD_SHA256, candidatePolicy, h5Assessments,
     artifactInventories: { baseline: first.baseline.armInventory, candidate: first.candidate.armInventory }, originalH4eConfirmation,
     originalProtocolAcceptance: "Baseline SLA misses are retained; H5c complete observation is not an original-deadline PASS",
@@ -550,16 +642,55 @@ if (phase === "compare") {
   assert.equal(noise.gatesSha256, result.gatesSha256, "Acceptance gates changed after A/A calibration");
   assert.equal(noise.comparatorSha256, result.comparatorSha256, "Comparator changed after A/A calibration");
   assert.ok(noise.pairCount >= 5);
+  if (h5) {
+    assert.equal(noise.pairCount, 5); assert.deepEqual(noise.aaSuitability?.rule, browserAaRule, "Browser A/A suitability rule changed");
+    const chronology = assertArmChronology(noise.armChronology);
+    assert.deepEqual(chronology, noise.armChronology, "Frozen A/A chronology was reordered");
+    assert.ok(armChronology![0].startedAtMs >= chronology.at(-1).finishedAtMs,
+      "Comparison must follow all owning calibration invocations");
+    const priorOwners = new Set(chronology.map(row => row.ownerReportSha256));
+    const priorCompanies = new Set(chronology.map(row => row.companyId));
+    const priorRuns = new Set(chronology.flatMap(row => row.runIds));
+    for (const arm of armChronology!) {
+      assert.ok(!priorOwners.has(arm.ownerReportSha256) && !priorCompanies.has(arm.companyId)
+        && arm.runIds.every((runId: string) => !priorRuns.has(runId)), "Comparison reuses a calibration owner/company/run");
+    }
+    assert.equal(noise.measurements?.length, measurements.length, "Frozen A/A is missing a predeclared metric");
+    assert.equal(noise.aaSuitability.metricCount, measurements.length);
+    for (const item of measurements) {
+      const controls = noise.measurements.filter((entry: any) => entry.name === item.name && entry.metric === item.metric);
+      assert.equal(controls.length, 1, "Frozen A/A needs exactly one calibration per metric");
+      const control = controls[0], actual = assessAaMetric(control.samples, chronology);
+      assert.equal(actual.passed, true, "Unsuitable browser A/A cannot freeze noise");
+      assert.deepEqual(control.aaSuitability, actual, "Browser A/A suitability was forged");
+      assert.equal(control.aaNoiseEnvelopeAbsoluteMs, actual.observedNoiseAbsoluteMs, "Browser absolute noise was forged");
+      assert.equal(control.aaNoiseEnvelopeRelative, actual.observedNoiseRelative, "Browser relative noise was forged");
+      assert.equal(control.representationLimited, actual.representationLimited, "Browser representation flag was forged");
+    }
+    assert.equal(noise.aaSuitability.passed, true, "Unsuitable browser A/A cannot freeze noise");
+  }
   result.gates = measurements.map(item => {
     const control = noise.measurements.find((entry: any) => entry.name === item.name && entry.metric === item.metric);
     assert.ok(control);
     const improvementRequired = expectation === "improvement" && item.name === "burst512"
-      && ["emissionToVisible.p95Ms", "intendedToVisible.p95Ms", "drainThroughTerminalMs"].includes(item.metric);
-    const noRegression = -item.medianPairedImprovementRelative <= control.aaNoiseEnvelopeRelative;
-    const paired = noiseExceedingPairedWins(item.samples.map(sample => sample.improvementRelative), control.aaNoiseEnvelopeRelative);
+      && ["emissionToVisible.p95Ms", "intendedToVisible.p95Ms", "drainThroughTerminalMs",
+        "h5.independentDrain.elapsedFromEpochMs"].includes(item.metric);
+    const representationLimited = h5 && (control.representationLimited || item.representationLimited);
+    if (representationLimited) {
+      item.representationLimited = true; item.percentageGainClaimAllowed = false; item.medianPairedImprovementRelative = null;
+    }
+    const medianImprovementRelative = median(item.samples.map(sample => sample.improvementRelative));
+    const medianImprovementMs = median(item.samples.map(sample => sample.improvementMs));
+    const noRegression = representationLimited ? -medianImprovementMs <= control.aaNoiseEnvelopeAbsoluteMs
+      : -medianImprovementRelative <= control.aaNoiseEnvelopeRelative;
+    const paired = noiseExceedingPairedWins(item.samples.map(sample => h5 && sample.improvementMs <= 2 ? 0 : sample.improvementRelative), control.aaNoiseEnvelopeRelative);
     const improvement = paired.pairedWinRequirementPassed
-      && item.medianPairedImprovementRelative > control.aaNoiseEnvelopeRelative;
+      && medianImprovementRelative > control.aaNoiseEnvelopeRelative && (!h5 || medianImprovementMs > 2);
     return { name: item.name, metric: item.metric, improvementRequired, noiseEnvelopeRelative: control.aaNoiseEnvelopeRelative,
+      ...(h5 ? { noiseEnvelopeAbsoluteMs: control.aaNoiseEnvelopeAbsoluteMs, representationLimited,
+        percentageGainClaimAllowed: !representationLimited, sub2msOrP99GainClaimAllowed: false,
+        nonregressionScale: representationLimited ? "observed-absolute-ms" : "observed-relative",
+        requiredAbsoluteImprovementAboveMs: improvementRequired ? 2 : undefined } : {}),
       noiseExceedingPairedWins: paired.noiseExceedingPairedWins, requiredPairedWins: paired.requiredPairedWins,
       passed: improvementRequired ? improvement : noRegression };
   });
@@ -588,6 +719,8 @@ if (phase === "compare") {
 }
 if (arg("output")) await writeFile(arg("output")!, JSON.stringify(result, null, 2));
 console.log(JSON.stringify(result, null, 2));
+if (h5 && phase === "aa") assert.equal(result.aaSuitability.passed, true,
+  "Browser A/A suitability failed; retain all ten arms, diagnose and review a fresh calibration");
 if (process.argv.includes("--require-performance")) {
   assert.equal(h5, true, "H5c performance-only gating is explicit; default H4e keeps original deadlines");
   assert.equal(phase, "compare");
diff --git a/scripts/native-ingestion-h5.test.mjs b/scripts/native-ingestion-h5.test.mjs
index 0c04e043eca..a54364447d3 100644
--- a/scripts/native-ingestion-h5.test.mjs
+++ b/scripts/native-ingestion-h5.test.mjs
@@ -3,23 +3,20 @@ import { test } from 'node:test';
 import { createRequire } from 'node:module';
 import { readFile } from 'node:fs/promises';
 import { h5Enabled, H5_MODE, observeStreaming, originalTerminal, requireH5Candidate,
-  H5_LIMITS, ORIGINAL_BUDGETS, prepareParticipantAgents, observeRunSettlement } from '../tests/e2e/fixtures/native-ingestion-h5.mjs';
+  H5_LIMITS, ORIGINAL_BUDGETS, prepareParticipantAgents, observeRunSettlement, collectDurableRunEvents, assertDurableRunEvents,
+  assertPreludeEvents, assertVisibleMarkerClocks } from '../tests/e2e/fixtures/native-ingestion-h5.mjs';
 
 const timeout = milliseconds => Object.assign(new Error(`Timeout ${milliseconds}ms exceeded while waiting on the predicate`),
   { matcherResult: { name: 'toBeGreaterThanOrEqual', pass: false } });
 
-test('the actual paginated result counter counts accepted results in default H4e and observation H5c', async () => {
-  const source = await readFile(new URL('../tests/e2e/native-event-ingestion.journey.ts', import.meta.url), 'utf8');
-  const statements = source.split('\n').filter(line => line.includes('resultAcceptedEvents++'));
-  assert.equal(statements.length, 1, 'Exercise the actual event-loop counter statement');
-  const count = new Function('h5', 'rows', `let resultAcceptedEvents = 0;
-    for (const row of rows) { const event = row.payload?.prpEvent; ${statements[0]} } return resultAcceptedEvents;`);
-  for (const h5 of [false, true]) {
-    assert.equal(count(h5, [{ eventType: 'run.result.accepted', payload: { prpEvent: { eventType: 'run.result.accepted' } } }]), 1);
-    assert.equal(count(h5, [{ payload: { prpEvent: { eventType: 'run.result.accepted' } } }]), 1);
-    assert.equal(count(h5, [{ eventType: 'run.result.proposed' }, { payload: { prpEvent: { eventType: 'item.delta' } } }]), 0);
-    assert.equal(count(h5, []), 0);
-  }
+test('the actual durable collector counts each accepted row once in default H4e and observation H5c', () => {
+  for (const row of [
+    { eventType: 'run.result.accepted', payload: { prpEvent: { eventType: 'run.result.accepted' } } },
+    { payload: { prpEvent: { eventType: 'run.result.accepted' } } },
+    { eventType: 'run.result.accepted' }]) assert.equal(collectDurableRunEvents([row], 'q7').resultAcceptedEvents, 1);
+  assert.equal(collectDurableRunEvents([{ eventType: 'run.result.proposed' },
+    { payload: { prpEvent: { eventType: 'item.delta' } } }], 'q7').resultAcceptedEvents, 0);
+  assert.equal(collectDurableRunEvents([], 'q7').resultAcceptedEvents, 0);
 });
 
 test('real frozen Playwright tiny poll exposes the matcher deadline shape used by H5', async () => {
@@ -231,3 +228,87 @@ test('cursor inherits only paired exact known misses; final candidate inherits n
   assert.throws(() => requireH5Candidate('final-b2', base, base), /every original SLA/);
   assert.throws(() => requireH5Candidate('final-b2', slowInvocation, slowInvocation), /every original SLA/);
 });
+
+
+const durableFixture = ({ stop = false, count = 4 } = {}) => {
+  const runId = 'run-1', token = 'provider-1', markerCode = 'q7';
+  const rows = Array.from({ length: count }, (_, index) => ({ seq: index+1, payload: { prpEvent: {
+    eventType: 'item.delta', runId, sourceInstanceId: 'source-1', sourceEventId: `event-${index}`, sourceSeq: index+1,
+    payload: { text: `[${markerCode}${index.toString(36)}] ` } } } }));
+  if (!stop) rows.push({ seq: count+1, eventType: 'run.result.accepted' });
+  return { rows, input: { runId, token, markerCode, events: 4, stop, requireNativeIdentity: true,
+    sourceClocks: new Map(Array.from({ length: 4 }, (_, index) => [index, { nonce: token, markerCode, index,
+      intendedMs: 1000+index*25, emittedMs: 1000+index*25, receivedAtMs: 1001+index*25 }])),
+    visible: Array.from({ length: stop ? count : 4 }, (_, index) => ({ index, markerCode, visibleMs: 1003+index*25 })) } };
+};
+const checkDurable = fixture => assertDurableRunEvents({ ...fixture.input,
+  collected: collectDurableRunEvents(fixture.rows, fixture.input.markerCode) });
+
+test('durable oracle retains complete per-run evidence in H4e and H5c and permits only the canonical Stop prefix', () => {
+  for (const requireNativeIdentity of [false,true]) {
+    const fixture = durableFixture(); fixture.input.requireNativeIdentity = requireNativeIdentity;
+    assert.deepEqual(checkDurable(fixture), { runId: 'run-1', token: 'provider-1', markerCode: 'q7', individualDeltas: 4,
+      uniqueSourceIdentities: 4, matchedSourceClocks: 4, ordered: true, resultAcceptedEvents: 1 });
+  }
+  const stopped = durableFixture({ stop: true, count: 2 });
+  assert.equal(checkDurable(stopped).individualDeltas, 2);
+  assert.equal(checkDurable(stopped).resultAcceptedEvents, 0);
+  assert.equal(stopped.input.sourceClocks.size, 4, 'Raw emissions outside the durable Stop prefix remain permitted');
+});
+test('durable oracle rejects corrupted payloads, coalescing, replay identity conflicts, gaps and foreign runs', () => {
+  const changes = [
+    fixture => { fixture.rows[0].payload.prpEvent.payload.text = '[q70] corruption'; },
+    fixture => { fixture.rows[0].payload.prpEvent.payload.text = '[q70] [q71] '; },
+    fixture => { fixture.rows[1].payload.prpEvent.sourceEventId = 'event-0'; fixture.rows[1].payload.prpEvent.sourceSeq = 1; },
+    fixture => { fixture.rows.splice(1,1); }, fixture => { fixture.rows.splice(1,0,fixture.rows[0]); },
+    fixture => { fixture.rows.reverse(); }, fixture => { fixture.rows[0].payload.prpEvent.runId = 'foreign-run'; },
+    fixture => { fixture.rows[0].payload.prpEvent.sourceInstanceId = ''; },
+    fixture => { fixture.rows[0].payload.prpEvent.sourceEventId = ''; },
+    fixture => { fixture.rows[0].payload.prpEvent.sourceSeq = 0; },
+    fixture => { fixture.rows[0].payload.prpEvent.sourceSeq = '1'; },
+  ];
+  for (const change of changes) {
+    const fixture = durableFixture(); change(fixture);
+    assert.throws(() => checkDurable(fixture), /Durable run run-1/, 'Failure must identify its exact run');
+  }
+});
+test('durable oracle rejects wrong or missing original clock joins, wrong source counts and result counts', () => {
+  for (const change of [
+    fixture => { fixture.input.sourceClocks.delete(0); },
+    fixture => { fixture.input.sourceClocks.get(0).nonce = 'foreign-source'; },
+    fixture => { fixture.input.sourceClocks.get(0).markerCode = 'z9'; },
+    fixture => { fixture.input.sourceClocks.get(0).index = 1; },
+    fixture => { fixture.input.sourceClocks.set(9, { nonce: 'provider-1', markerCode: 'q7', index: 9 }); },
+    fixture => { fixture.rows.pop(); }, fixture => { fixture.rows.push({ eventType: 'run.result.accepted' }); },
+  ]) { const fixture = durableFixture(); change(fixture); assert.throws(() => checkDurable(fixture), /Durable run run-1/); }
+});
+test('durable Stop oracle rejects visible markers outside the ordered durable prefix or an accepted result', () => {
+  const missing = durableFixture({ stop: true, count: 2 }); missing.input.visible.push({ index: 2 });
+  assert.throws(() => checkDurable(missing), /visible Stop marker 2/);
+  const gap = durableFixture({ stop: true, count: 2 }); gap.rows.shift(); assert.throws(() => checkDurable(gap), /canonical Stop prefix/);
+  const result = durableFixture({ stop: true, count: 2 }); result.rows.push({ eventType: 'run.result.accepted' });
+  assert.throws(() => checkDurable(result), /exact accepted result count/);
+});
+test('prelude oracle preserves exact setup payloads, source tuple uniqueness, count and prelude-only selection', () => {
+  const rows = [0,1,2].map(index => ({ payload: { prpEvent: { eventType: 'item.delta', itemId: 'prelude-turn',
+    sourceInstanceId: 'source-1', sourceEventId: `event-${index}`, sourceSeq: index+1,
+    payload: { text: index === 2 ? ' PRELUDE_provider-1_READY ' : '.' } } } }));
+  const check = selected => assertPreludeEvents({ rows: selected, runId: 'run-1', token: 'provider-1', expectedEvents: 3 });
+  assert.deepEqual(check([...rows,{ payload: { prpEvent: { eventType: 'item.delta', itemId: 'measured-turn' } } }]),
+    { individualDeltas: 3, uniqueSourceIdentities: 3 });
+  assert.throws(() => check(rows.slice(1)), /Prelude run run-1/);
+  const bad = structuredClone(rows); bad[0].payload.prpEvent.payload.text = '..'; assert.throws(() => check(bad), /complete normalized payload/);
+  const replay = structuredClone(rows); Object.assign(replay[1].payload.prpEvent, { sourceEventId: 'event-0', sourceSeq: 1 });
+  assert.throws(() => check(replay), /unique source identity tuples/);
+});
+test('visible-clock oracle preserves original two-frame timestamps and rejects missing clocks or incomplete unique output', () => {
+  const fixture = durableFixture(), { visible: seenMarkers, sourceClocks } = fixture.input;
+  const check = (seen = seenMarkers, clocks = sourceClocks, stop = false) => assertVisibleMarkerClocks({
+    seenMarkers: seen, sourceClocks: clocks, markerCode: 'q7', expectedEvents: 4, stop });
+  const visible = check(); assert.deepEqual(visible.map(row => row.visibleMs), seenMarkers.map(row => row.visibleMs));
+  assert.deepEqual(visible.map(row => row.emittedMs), [...sourceClocks.values()].map(row => row.emittedMs));
+  assert.throws(() => check(seenMarkers, new Map()), /Missing original provider clock/);
+  assert.throws(() => check(seenMarkers.slice(1)), /complete unique foreground count/);
+  assert.throws(() => check([seenMarkers[0],seenMarkers[0],seenMarkers[2],seenMarkers[3]]), /complete unique foreground count/);
+  assert.equal(check(seenMarkers.slice(0,2), sourceClocks, true).length, 2);
+});
diff --git a/scripts/native-ingestion-performance-gates.test.mjs b/scripts/native-ingestion-performance-gates.test.mjs
index 0c0d75ee1ac..6b818188106 100644
--- a/scripts/native-ingestion-performance-gates.test.mjs
+++ b/scripts/native-ingestion-performance-gates.test.mjs
@@ -234,7 +234,7 @@ test("H5 assessor retains an original SLA failure assessed before its nominal st
   assert.throws(() => requireH5Candidate("final-b2", outcome, outcome), /every original SLA/);
 });
 
-test("H5 CLI retains baseline SLA failure, rejects final SLA misses and requires complete owning evidence", async () => {
+test("H5 CLI retains baseline SLA failure, rejects final SLA misses and requires complete owning evidence", async context => {
   const directory = await mkdtemp(path.join(os.tmpdir(), "native-ingestion-h5-gates-"));
   const script = new URL("./compare-native-ingestion-browser.ts", import.meta.url);
   const save = async (name, value) => { const file = path.join(directory, name); await writeFile(file, JSON.stringify(value)); return file; };
@@ -271,11 +271,17 @@ test("H5 CLI retains baseline SLA failure, rejects final SLA misses and requires
     for (let index = 0; index < 5; index++) {
       const entry = {};
       for (const arm of ["baseline", "candidate"]) {
-        const report = h5Report(arm === "baseline" || sameRevision ? baselineRevision : candidateRevision, arm === "baseline" ? 180000 : candidateLatency);
+        const ordinal = 2 * index + (arm === "baseline" ? index % 2 : index % 2 ? 0 : 1);
+        const startedAtMs = Date.parse(sameRevision ? "2026-11-02T00:00:00.000Z" : "2026-11-03T00:00:00.000Z") + ordinal * 2000000;
+        const ownedIdPrefix = createHash("sha256").update(prefix).digest("hex").slice(0,6) + ordinal.toString(16).padStart(2,"0");
+        const report = JSON.parse(JSON.stringify(h5Report(arm === "baseline" || sameRevision ? baselineRevision : candidateRevision,
+          arm === "baseline" ? 180000 : candidateLatency)).replaceAll("00000000-", `${ownedIdPrefix}-`), (key, value) =>
+          typeof value === "number" && (key.endsWith("AtMs") || ["epochMs", "deadlineMs", "readinessDeadlineMs", "visibleMs", "intendedMs", "emittedMs"].includes(key)) ? value + startedAtMs : value);
+        report.bodyFinishedAtMs = startedAtMs + duration - 1;
         const owner = { timeout: 1200000, expectedStatus: "passed", results: [{ status: "passed", retry: 0,
-          duration, startTime: "2026-11-03T00:00:00.000Z", errors: [], attachments: [] }] };
+          duration, startTime: new Date(startedAtMs).toISOString(), errors: [], attachments: [] }] };
         if (index === 0 && arm === "candidate") mutate?.(report, owner);
-        mutateArm?.(report, { index, arm });
+        mutateArm?.(report, { index, arm, owner });
         owner.results[0].attachments.push({ name: "native-ingestion-evidence", contentType: "application/json",
           body: Buffer.from(JSON.stringify(report)).toString("base64") });
         entry[`${arm}File`] = await save(`${prefix}-${index}-${arm}.json`, report);
@@ -299,11 +305,90 @@ test("H5 CLI retains baseline SLA failure, rejects final SLA misses and requires
     const originalInventory = await inventory(proof, originalProof, "original-h4c");
     const finalProofArgs = [`--original-h4e-proof=${originalProof}`, `--original-h4e-inventory=${originalInventory}`];
     const noise = path.join(directory, "aa.json");
-    const aa = run(["--phase=aa", `--pairs=${await manifest("aa", 181000, { sameRevision: true })}`, `--output=${noise}`]);
+    const aaManifest = await manifest("aa", 181000, { sameRevision: true });
+    const aa = run(["--phase=aa", `--pairs=${aaManifest}`, `--output=${noise}`]);
     assert.equal(aa.status, 0, aa.stderr);
     const aaReport = JSON.parse(await readFile(noise, "utf8"));
     assert.equal(aaReport.h5Assessments.length, 5);
+    assert.equal(aaReport.measurements.filter(item => item.metric === "h5.independentDrain.elapsedFromEpochMs").length, 5,
+      "Every non-Stop case needs its own verified-completion A/A noise");
+    assert(aaReport.measurements.find(item => item.name === "burst512" && item.metric === "h5.independentDrain.elapsedFromEpochMs").aaNoiseEnvelopeRelative > 0);
     assert.deepEqual(aaReport.h5Assessments[0].baseline.misses, ["burst512:streaming120"]);
+    assert.equal(aaReport.aaSuitability.passed, true); assert.equal(aaReport.armChronology.length, 10);
+    assert.equal(new Set(aaReport.armChronology.map(arm => arm.companyId)).size, 10);
+    for (const [name, mutateArm, expectation] of [
+      ["aa-paired-jitter", (report, { arm, index }) => { if (arm === "candidate" && index === 4) report.cases[0].firstVisibleAfterEmissionMs = 1300; }, "paired"],
+      ["aa-chronological-drift", (report, { index }) => { report.cases[0].firstVisibleAfterEmissionMs = 1000 + index * 60; }, "chronological"],
+      ["aa-role-bias", (report, { arm }) => { report.cases[0].firstVisibleAfterEmissionMs = arm === "candidate" ? 1120 : 1000; }, "role"],
+    ]) {
+      const output = path.join(directory, `${name}.json`);
+      const attempt = run(["--phase=aa", `--pairs=${await manifest(name, 180000, { sameRevision: true, mutateArm })}`, `--output=${output}`]);
+      assert.notEqual(attempt.status, 0, name); assert.match(attempt.stderr, /A\/A suitability failed/);
+      const unsuitable = JSON.parse(await readFile(output, "utf8"));
+      assert.equal(unsuitable.aaSuitability.passed, false); assert.equal(unsuitable.armChronology.length, 10);
+      const metric = unsuitable.measurements.find(item => item.name === "paced" && item.metric === "firstVisibleAfterEmissionMs").aaSuitability;
+      if (expectation === "paired") assert(metric.pairedDifferencesMs.some((value,index) => value > metric.pairedLimitsMs[index]));
+      if (expectation === "chronological") { assert.equal(metric.observedNoiseAbsoluteMs, 0); assert(metric.chronologicalMedianDriftMs > metric.chronologicalDriftLimitMs); }
+      if (expectation === "role") assert(metric.roleMedianDriftMs > metric.roleDriftLimitMs);
+    }
+    for (const [name, mutateArm] of [
+      ["aa-missing-owner-time", (_report, { arm, index, owner }) => { if (arm === "candidate" && index === 0) delete owner.results[0].startTime; }],
+      ["aa-overlap", (_report, { arm, index, owner }) => { if (arm === "candidate" && index === 0) owner.results[0].startTime = "2026-11-02T00:00:00.001Z"; }],
+      ["aa-wrong-order", (_report, { arm, index, owner }) => { if (index === 1) owner.results[0].startTime = new Date(Date.parse("2026-11-02T00:00:00.000Z") + (arm === "baseline" ? 4 : 5) * 1000000).toISOString(); }],
+      ["aa-reused-company-run", (report) => { const prefix = report.companyId.slice(0,8); Object.assign(report, JSON.parse(JSON.stringify(report).replaceAll(`${prefix}-`, "00000000-"))); }],
+    ]) {
+      const attempt = run(["--phase=aa", `--pairs=${await manifest(name, 180000, { sameRevision: true, mutateArm })}`]);
+      assert.notEqual(attempt.status, 0, name);
+    }
+    for (const [name, forge] of [
+      ["forged-absolute-noise", noise => { noise.measurements[0].aaNoiseEnvelopeAbsoluteMs = 9999; }],
+      ["forged-relative-noise", noise => { noise.measurements[0].aaNoiseEnvelopeRelative = 9; }],
+      ["forged-representation", noise => { noise.measurements[0].representationLimited = !noise.measurements[0].representationLimited; }],
+      ["forged-suitability", noise => { noise.measurements[0].aaSuitability.pairedLimitsMs[0] = 9999; }],
+      ["forged-sample", noise => { noise.measurements[0].samples[0].improvementMs++; }],
+      ["forged-rule", noise => { noise.aaSuitability.rule.contrastRepresentationFloorMs = 1000; }],
+    ]) {
+      const forged = structuredClone(aaReport); forge(forged);
+      const attempt = run(["--expect=nonregression", "--candidate-policy=cursor-nonregression",
+        `--pairs=${await manifest(name, 180000, { candidateRevision: "B1" })}`, `--noise-report=${await save(`${name}-noise.json`, forged)}`, "--require-performance"]);
+      assert.notEqual(attempt.status, 0, name); assert.match(attempt.stderr, /forged|rule changed/);
+    }
+    for (const repeat of [1,2]) {
+      const shortNoise = path.join(directory, `short-${repeat}-noise.json`);
+      const aa = run(["--phase=aa", `--pairs=${await manifest(`short-${repeat}-aa`, 180000, { sameRevision: true,
+        mutateArm: (report, { arm }) => { report.cases[0].firstVisibleAfterEmissionMs = arm === "candidate" ? repeat : 1; } })}`, `--output=${shortNoise}`]);
+      assert.equal(aa.status, 0, aa.stderr);
+      const calibrated = JSON.parse(await readFile(shortNoise, "utf8"));
+      const control = calibrated.measurements.find(item => item.name === "paced" && item.metric === "firstVisibleAfterEmissionMs");
+      assert.equal(control.representationLimited, true); assert.equal(control.percentageGainClaimAllowed, false);
+      assert.equal(control.medianPairedImprovementRelative, null); assert.equal(control.aaNoiseEnvelopeAbsoluteMs, repeat - 1);
+      const output = path.join(directory, `short-${repeat}-regression.json`);
+      const attempt = run(["--expect=nonregression", "--candidate-policy=cursor-nonregression",
+        `--pairs=${await manifest(`short-${repeat}-regression`, 180000, { candidateRevision: "B1", mutateArm: (report, { arm }) => {
+          report.cases[0].firstVisibleAfterEmissionMs = repeat === 1 ? arm === "candidate" ? 2 : 1 : arm === "candidate" ? 12 : 10;
+        } })}`, `--noise-report=${shortNoise}`, `--output=${output}`, "--require-performance"]);
+      assert.notEqual(attempt.status, 0, "The suitability floor must not pad actual observed absolute noise");
+      const compared = JSON.parse(await readFile(output, "utf8"));
+      const gate = compared.gates.find(item => item.name === "paced" && item.metric === "firstVisibleAfterEmissionMs");
+      assert.equal(gate.noiseEnvelopeAbsoluteMs, repeat - 1); assert.equal(gate.representationLimited, true); assert.equal(gate.passed, false);
+      if (repeat === 2) {
+        const improving = path.join(directory, "short-calibrated-improvement.json");
+        const changed = run(["--expect=nonregression", "--candidate-policy=cursor-nonregression",
+          `--pairs=${await manifest("short-calibrated-improvement", 180000, { candidateRevision: "B1", mutateArm: (report, { arm }) => {
+            report.cases[0].firstVisibleAfterEmissionMs = arm === "candidate" ? 1 : 100;
+          } })}`, `--noise-report=${shortNoise}`, `--output=${improving}`, "--require-performance"]);
+        assert.equal(changed.status, 0, changed.stderr);
+        const measured = JSON.parse(await readFile(improving, "utf8")).measurements.find(item => item.name === "paced" && item.metric === "firstVisibleAfterEmissionMs");
+        assert.equal(measured.representationLimited, true); assert.equal(measured.percentageGainClaimAllowed, false);
+        assert.equal(measured.medianPairedImprovementRelative, null, "Short calibration cannot turn into a percentage gain claim");
+      }
+    }
+    const replayedOwners = JSON.parse(await readFile(await manifest("reused-aa-owner", 180000, { candidateRevision: "B1" }), "utf8"));
+    const oldOwners = JSON.parse(await readFile(aaManifest, "utf8"));
+    for (const field of ["baselineFile", "baselinePlaywrightFile", "baselineInventoryFile"]) replayedOwners[0][field] = oldOwners[0][field];
+    const replay = run(["--expect=nonregression", "--candidate-policy=cursor-nonregression",
+      `--pairs=${await save("reused-aa-owner-pairs.json", replayedOwners)}`, `--noise-report=${noise}`, "--require-performance"]);
+    assert.notEqual(replay.status, 0); assert.match(replay.stderr, /calibration|reus/);
     const cursor = run(["--expect=nonregression", "--candidate-policy=cursor-nonregression",
       `--pairs=${await manifest("cursor", 180000, { candidateRevision: "B1" })}`, `--noise-report=${noise}`, "--require-acceptance"]);
     assert.equal(cursor.status, 0, cursor.stderr);
@@ -318,6 +403,69 @@ test("H5 CLI retains baseline SLA failure, rejects final SLA misses and requires
     const goodPairs = await manifest("good", 1000);
     const good = run(["--candidate-policy=final-b2", `--pairs=${goodPairs}`, `--noise-report=${noise}`, ...finalProofArgs, "--require-acceptance"]);
     assert.equal(good.status, 0, good.stderr);
+    const completionRegressionPairs = await manifest("verified-drain-regression", 1000, {
+      mutateArm: (report, { arm }) => {
+        if (arm !== "candidate") return;
+        const item = report.cases[3];
+        Object.assign(item.h5.independentDrain, { elapsedFromEpochMs: 200000, verifiedAtMs: item.epochMs + 200000 });
+      } });
+    const completionRegressionOutput = path.join(directory, "verified-drain-regression.json");
+    const completionRegression = run(["--candidate-policy=final-b2", `--pairs=${completionRegressionPairs}`,
+      `--noise-report=${noise}`, `--output=${completionRegressionOutput}`, "--require-performance"]);
+    const completionRegressionReport = JSON.parse(await readFile(completionRegressionOutput, "utf8"));
+    context.diagnostic(JSON.stringify({ regression: "browser and terminal faster but independently verified completion slower",
+      comparatorSha256: completionRegressionReport.comparatorSha256, exit: completionRegression.status,
+      performancePassed: completionRegressionReport.performancePassed, baselineVerifiedMs: 180010, candidateVerifiedMs: 200000,
+      verifiedCompletionGate: completionRegressionReport.gates.find(gate => gate.name === "burst512"
+        && gate.metric === "h5.independentDrain.elapsedFromEpochMs") ?? null }));
+    assert.notEqual(completionRegression.status, 0, "Faster browser/terminal must not conceal slower fully verified completion");
+    const regressionGate = completionRegressionReport.gates.find(gate => gate.name === "burst512"
+      && gate.metric === "h5.independentDrain.elapsedFromEpochMs");
+    assert.equal(regressionGate.improvementRequired, true); assert.equal(regressionGate.passed, false);
+    assert(completionRegressionReport.gates.filter(gate => gate.name === "burst512" &&
+      ["emissionToVisible.p95Ms", "intendedToVisible.p95Ms", "drainThroughTerminalMs"].includes(gate.metric)).every(gate => gate.passed));
+    const goodReport = JSON.parse(good.stdout);
+    const rate = goodReport.verifiedCompletionRates.find(item => item.name === "burst512");
+    assert.equal(rate.samples[0].measuredDeltas, 51200);
+    assert.equal(rate.samples[0].baselineDeltasPerSecond, 51200000 / 180010);
+    assert.equal(rate.samples[0].candidateDeltasPerSecond, 51200000 / 1010);
+    assert(rate.candidateMedianDeltasPerSecond > rate.baselineMedianDeltasPerSecond);
+    for (const beyondNoise of [3,4]) {
+      const output = path.join(directory, `verified-drain-${beyondNoise}-wins.json`);
+      const attempt = run(["--candidate-policy=final-b2", `--pairs=${await manifest(`verified-drain-${beyondNoise}-wins`, 1000, {
+        mutateArm: (report, { arm, index }) => {
+          if (arm !== "candidate") return;
+          const item = report.cases[3], elapsed = index < beyondNoise ? 90000 : 179500;
+          Object.assign(item.h5.independentDrain, { elapsedFromEpochMs: elapsed, verifiedAtMs: item.epochMs + elapsed });
+        } })}`, `--noise-report=${noise}`, `--output=${output}`, "--require-performance"]);
+      assert.equal(attempt.status === 0, beyondNoise === 4, attempt.stderr);
+      const compared = JSON.parse(await readFile(output, "utf8"));
+      const gate = compared.gates.find(item => item.name === "burst512" && item.metric === "h5.independentDrain.elapsedFromEpochMs");
+      assert.equal(gate.noiseExceedingPairedWins, beyondNoise); assert.equal(gate.requiredPairedWins, 4);
+      assert.equal(gate.passed, beyondNoise === 4);
+    }
+    const zeroNoise = path.join(directory, "zero-noise.json");
+    const zeroAA = run(["--phase=aa", `--pairs=${await manifest("zero-noise-aa", 180000, { sameRevision: true })}`, `--output=${zeroNoise}`]);
+    assert.equal(zeroAA.status, 0, zeroAA.stderr);
+    for (const resolvedPairs of [0,3,4]) {
+      const output = path.join(directory, `timestamp-gain-${resolvedPairs}.json`);
+      const attempt = run(["--candidate-policy=final-b2", `--pairs=${await manifest(`timestamp-gain-${resolvedPairs}`, 1000, {
+        mutateArm: (report, { arm, index }) => {
+          if (arm !== "candidate") return;
+          const item = report.cases[3], gain = resolvedPairs === 0 ? 1 : index < resolvedPairs ? 3 : 2;
+          Object.assign(item.h5.independentDrain, { elapsedFromEpochMs: 180010 - gain, verifiedAtMs: item.epochMs + 180010 - gain });
+        } })}`, `--noise-report=${zeroNoise}`, `--output=${output}`, "--require-performance"]);
+      assert.equal(attempt.status === 0, resolvedPairs === 4, attempt.stderr);
+      const gate = JSON.parse(await readFile(output, "utf8")).gates.find(item => item.name === "burst512"
+        && item.metric === "h5.independentDrain.elapsedFromEpochMs");
+      assert.equal(gate.noiseExceedingPairedWins, resolvedPairs); assert.equal(gate.requiredAbsoluteImprovementAboveMs, 2);
+    }
+    const cursorCompletionRegression = run(["--expect=nonregression", "--candidate-policy=cursor-nonregression",
+      `--pairs=${await manifest("cursor-verified-drain-regression", 180000, { candidateRevision: "B1", mutateArm: (report, { arm }) => {
+        if (arm !== "candidate") return;
+        const item = report.cases[3]; Object.assign(item.h5.independentDrain, { elapsedFromEpochMs: 200000, verifiedAtMs: item.epochMs + 200000 });
+      } })}`, `--noise-report=${noise}`, "--require-performance"]);
+    assert.notEqual(cursorCompletionRegression.status, 0, "Cursor nonregression must include fully verified completion");
     const wrongPolicy = run(["--expect=nonregression", "--candidate-policy=cursor-nonregression", `--pairs=${goodPairs}`,
       `--noise-report=${noise}`, "--require-acceptance"]);
     assert.notEqual(wrongPolicy.status, 0); assert.match(wrongPolicy.stderr, /Cursor policy requires B0→B1/);
@@ -447,6 +595,8 @@ test("H5 CLI retains baseline SLA failure, rejects final SLA misses and requires
       ["stop-recorded-provider-failure", report => { report.cases[5].recordedFailures.rows[0].current_error_code = "provider_transport_failed"; }, /recorded failed run must have recovered/],
       ["censored", report => { report.cases[3].h5.streaming.observation.censored = true; }, /false/],
       ["terminal-failed", report => { report.cases[3].terminalStatuses[99].status = "failed"; }, /successful drainage/],
+      ["missing-independent-drain", report => { delete report.cases[3].h5.independentDrain; }, /independentDrain|verifiedAtMs|Cannot read/],
+      ["tampered-independent-drain", report => { report.cases[3].h5.independentDrain.elapsedFromEpochMs++; }, /strictly equal/],
       ["result-missing", report => { report.cases[3].durable[99].resultAcceptedEvents = 0; }, /persisted result/],
       ["missing-delta", report => { report.cases[3].durable[99].individualDeltas--; }, /individualDeltas|result.events|512/],
       ["wrong-workload", report => { report.workloadSha256 = "old"; }, /registration changed/],
diff --git a/tests/e2e/fixtures/native-ingestion-h5.md b/tests/e2e/fixtures/native-ingestion-h5.md
index 94c16439628..a503f1cdca8 100644
--- a/tests/e2e/fixtures/native-ingestion-h5.md
+++ b/tests/e2e/fixtures/native-ingestion-h5.md
@@ -305,3 +305,165 @@ queue/backlog, delay and memory with identical capture hooks. Aborted profiles
 remain diagnostic-only and cannot establish complete CPU/event costs. No CPU
 requirement or profiling is added to this timing comparator. Local results do
 not establish deployed improvement.
+
+## Prospective H5d oracle instrumentation and verified-completion gate
+
+H5d adds oracle instrumentation and a prospective completion gate from frozen H5c
+`e431ec63d41fe90c6fd68bd2fc2bb969feeca917`. It keeps the exact H5/H4e mode,
+protocol, registration, workload and deadline constants. The new driver commit
+and changed nine-file measurement digest distinguish the experiment. No product
+optimization, new buffering, setup/control flow, payload bound, provider fixture,
+transport, public API, P0 ordering or raw-ACK durability policy changes here.
+All fifty main arms, including fresh B0/B1 A/A, must be rerun on the qualified new
+source; old noise or the failed H5c attempt cannot qualify H5d.
+
+The retained H5c FULL B0 attempt reached the unchanged 1,200,000-ms observation
+ceiling while fetching/validating independent durable events. Root's retained
+raw evidence records all 100 runs succeeded within 75.926 seconds of the same
+180-second settlement window, all 100 clock uploads ended with 51,200 emissions
+and no clock errors, and only roughly 30 of 100 per-run durable reads completed
+before timeout. Foreground completion remained 283.391 seconds, with only
+66/512 markers at the original streaming deadline. This owning attempt failed;
+complete in-journey transcript/results verification and later cases were not
+finished. A separate stopped read-only supplement cannot turn it into an arm
+pass. Product improvement is not established by that failure or this correction.
+
+Frozen H5c performed five Playwright assertions for every measured normalized
+delta and one Playwright deep-equality assertion for its original clock join.
+It also asserted each prelude payload and each visible clock through Playwright.
+H5d uses the same actual paginated API rows and provider clock maps, then validates
+those retained observations through Node assertions. Only verified per-run
+summaries enter the existing durable evidence array. The active failure record
+also identifies the current run, pagination cursor and returned row count.
+
+| Frozen check | H5d equivalent |
+| --- | --- |
+| Exact complete compact payload for every measured delta | `assertDurableRunEvents` checks the same full text, rejecting coalescing or added bytes |
+| Exact run, truthy source-instance/event IDs, positive safe integer sequence in H5 | Same assertions under the unchanged `requireNativeIdentity: h5` condition |
+| Original nonce, marker code and index for every durable event | Same tuple deep equality against the original provider clock map |
+| Unique normalized identity tuple and complete ordered indices | Same set count and exact ordered index array; Stop permits only its canonical prefix |
+| Every visible Stop marker is durable; normal result one / Stop result zero | Same prefix membership and exact accepted-result count |
+| Complete normal source-clock count and closed uploads | Existing clock-readiness/closure polls remain; Node oracle also checks the normal count |
+| Prelude exact dots/final readiness text, count and unique identity tuples | `assertPreludeEvents` checks the same filtered prelude rows before epoch release |
+| Every visible marker has an original clock; complete normal unique visible count | `assertVisibleMarkerClocks` checks the same observations and preserves the original two-frame timestamp |
+
+The same `/events?afterSeq=…&limit=1000` pages, advancing cursor checks and final
+empty-page read remain. The 30-second per-run provider-clock availability poll
+is unchanged and still occurs before the Node assertion. The 120/180/900-second
+original gates, 600/180/1,200-second observation ceilings, original late Stop ACK
+and lease polls, and outer resource watchdog remain unchanged. No per-event
+check is dropped to make the invocation finish.
+
+The frozen comparator9e01 validated `h5.independentDrain` correctness but omitted
+its elapsed duration from quantitative gates. A synthetic RED counterexample
+actually passed that comparator with faster browser/terminal delivery while full
+verified completion regressed from180,010 to200,000 ms. The prospective comparator
+adds `h5.independentDrain.elapsedFromEpochMs` to every non-Stop H5 case's existing
+measurement, own A/A noise and nonregression loops. For loaded burst512, final B2
+must also improve that duration beyond its own noise in the median and at least
+four of five pairs, alongside the existing browser p95 and terminal-duration
+gates. Three improving pairs do not pass. Cursor nonregression includes the same
+verified-completion metric. All previous gates and timing limits remain.
+
+Reports also derive measured normalized deltas per second from equal matched
+counts divided by that independently verified completion upper bound. For the
+loaded burst, N is51,200 complete measured deltas, with all100 accepted results
+independently checked. The duration includes oracle, reload, screenshot, normal
+API and lease verification overhead; it is not the exact last database-commit
+instant. This conservative observed completion rate is descriptive: the existing
+noise gate applies to duration, and no separate rate-noise threshold is invented.
+Equal counts make a shorter fully verified duration monotonically higher rate.
+Missing/tampered completion proof still fails the existing functional oracle.
+No accepted A/A exists. The following finite browser repeatability rule is
+chosen prospectively; source freezing still requires the combined root/peer review.
+
+### Prospective main-browser A/A suitability (H5 only)
+
+Before any B0 or B1 calibration data, choose exactly five alternating pairs and
+apply these rules independently to every declared case/metric after all existing
+functional, owning-report and cleanup checks. With pair durations a,b:
+
+- Every paired difference must satisfy `abs(a-b) <= max(0.20*a, 2 ms)`.
+- Sort the ten actual owning invocations by validated start. First-five versus
+  last-five median drift must satisfy `abs(lastMedian-firstMedian) <=
+  max(0.10*firstMedian, 2 ms)`.
+- The two five-sample role medians must also satisfy `abs(candidateMedian-
+  baselineMedian) <= max(0.10*baselineMedian, 2 ms)`.
+
+Require parseable owner start/duration, nonoverlap, registered baseline-first then
+candidate-first alternation, distinct owning reports, companies and run sets.
+A comparison must follow all calibration owners and reuse none of their evidence
+or owned data. Synthetic oracle fixtures represent this chronology and freshness
+explicitly; they do not establish that an application or provider ran.
+
+Retain all raw samples and owner chronology. Freeze the actual maximum paired
+absolute difference AND actual maximum paired relative difference. The 2-ms
+floor applies only to suitability and never replaces either observed envelope.
+Comparisons recompute these envelopes and suitability diagnostics from retained
+samples and reject altered envelopes, rules, flags or timestamps. Unsuitable A/A
+exits unsuccessfully after writing its complete diagnostic report; retain all ten
+arms and diagnose before a newly reviewed prospective observation. Do not inflate
+caps or silently replace an arm.
+
+If the pooled ten-value median is at most20 ms, label that metric
+representation-limited, suppress percentage-improvement claims and use its actual
+frozen absolute noise for nonregression: `median(candidate-baseline) <= observed
+absolute noise`. In particular, zero observed noise permits no positive regression
+even when the suitability floor was2 ms. Longer metrics retain the existing
+relative-noise nonregression rule. Loaded improvement still requires its existing
+relative-noise median and at least4/5 individual wins; each counted win and the
+median absolute improvement must additionally exceed2 ms before a numerical gain
+is claimed. No sub-2ms, p99 or percentage gain is claimed for representation-limited
+metrics. All original hard product/control deadlines remain unchanged.
+
+The floor describes integer-millisecond timestamp contrast representation only.
+It is not a frame period, paint guarantee, clock-accuracy bound or a bound on the
+settlement/Stop observer. The unchanged Playwright polls can wait1000 ms after a
+callback and incur API/scheduler time as well; no blanket1–2second tolerance is
+introduced. The blocked-Stop companion keeps its separate frozen100-ms policy.
+The default H4e comparator and journey semantics remain unchanged.
+
+### Deferred diagnostic design: Playwright assertion cost only
+
+This diagnostic has **not run**. After root review and an explicit quiet-window
+release, create an owned temporary standalone Playwright test/config outside the
+measured source. Do not inherit a config with `webServer`. Request no `page`,
+`browser` or `request` fixture; use one Node worker, no retries, trace/video off,
+and a bounded 300-second diagnostic timeout. It must start no app, database,
+provider or browser. Record the temporary source/config, Node and Playwright
+versions, source hashes, owning test status, raw durations and all failures.
+
+Generate 1,000 deterministic synthetic normalized rows and a matching clock map
+inside that test process. They are CPU-oracle inputs only: no provider output,
+application event or persisted outcome is seeded. Use the same six checks for
+both branches on the same objects:
+
+```ts
+// Planned scratch test functions, not an executed measurement.
+const checkPw = (event, original, index) => {
+  expect(event.payload.text).toBe(`[q7${index.toString(36)}] `);
+  expect(event.runId).toBe("diagnostic-run");
+  expect(event.sourceInstanceId).toBeTruthy();
+  expect(event.sourceEventId).toBeTruthy();
+  expect(Number.isSafeInteger(event.sourceSeq) && event.sourceSeq > 0).toBe(true);
+  expect({ nonce: original.nonce, markerCode: original.markerCode, index: original.index })
+    .toEqual({ nonce: "diagnostic-source", markerCode: "q7", index });
+};
+const checkNode = (event, original, index) => {
+  assert.equal(event.payload.text, `[q7${index.toString(36)}] `);
+  assert.equal(event.runId, "diagnostic-run");
+  assert.ok(event.sourceInstanceId);
+  assert.ok(event.sourceEventId);
+  assert.ok(Number.isSafeInteger(event.sourceSeq) && event.sourceSeq > 0);
+  assert.deepEqual({ nonce: original.nonce, markerCode: original.markerCode, index: original.index },
+    { nonce: "diagnostic-source", markerCode: "q7", index });
+};
+```
+
+Warm each branch once on 100 inputs outside timing. Then record five alternating
+pairs of all 1,000 inputs using monotonic `performance.now()` boundaries, retaining
+each elapsed time and six-check count. Do not disable normal Playwright assertion
+steps in its branch. Compare total completion duration and spread; keep diagnostic
+profiles separate. This tests assertion instrumentation overhead, not application
+ingestion throughput, browser responsiveness or acceptance. Full H5d qualification
+and the fresh frozen fifty-arm protocol remain required regardless of its result.
diff --git a/tests/e2e/fixtures/native-ingestion-h5.mjs b/tests/e2e/fixtures/native-ingestion-h5.mjs
index 3ba362667bc..b2efeda1713 100644
--- a/tests/e2e/fixtures/native-ingestion-h5.mjs
+++ b/tests/e2e/fixtures/native-ingestion-h5.mjs
@@ -334,6 +334,79 @@ export function assertRecordedFailures(proof, item, companyId) {
     recordedErrorClasses: Object.fromEntries([...classes].sort(([a], [b]) => a.localeCompare(b)).map(([code, ids]) => [code, ids.size])) };
 }
 
+// H5d only changes post-observation oracle instrumentation. These functions
+// check the same retained API rows and original provider clocks without making
+// a Playwright step for every normalized delta. They never drive the SUT.
+export function collectDurableRunEvents(rows, markerCode) {
+  const deltas = []; let resultAcceptedEvents = 0;
+  for (const row of rows) {
+    const event = row.payload?.prpEvent;
+    if (row.eventType === 'run.result.accepted' || event?.eventType === 'run.result.accepted') resultAcceptedEvents++;
+    if (event?.eventType !== 'item.delta') continue;
+    for (const match of String(event.payload?.text ?? '').matchAll(new RegExp(`\\[${markerCode}([a-z0-9]{1,3})\\]`, 'g'))) {
+      const index = Number.parseInt(match[1], 36);
+      deltas.push({ index, identity: `${event.sourceInstanceId}:${event.sourceEventId}:${event.sourceSeq}`, event });
+    }
+  }
+  return { deltas, resultAcceptedEvents };
+}
+
+export function assertDurableRunEvents({ collected, runId, token, markerCode, events, stop, sourceClocks, visible,
+  requireNativeIdentity }) {
+  const { deltas, resultAcceptedEvents } = collected;
+  for (const [ordinal,delta] of deltas.entries()) {
+    const { index, event } = delta, context = `Durable run ${runId} source ${token} delta ${ordinal} marker ${markerCode}:${index}`;
+    assert.equal(event.payload.text, `[${markerCode}${index.toString(36)}] `, `${context}: complete normalized payload`);
+    if (requireNativeIdentity) {
+      assert.equal(event.runId, runId, `${context}: exact run identity`);
+      assert.ok(event.sourceInstanceId, `${context}: nonempty source instance identity`);
+      assert.ok(event.sourceEventId, `${context}: nonempty source event identity`);
+      assert.ok(Number.isSafeInteger(event.sourceSeq) && event.sourceSeq > 0, `${context}: positive integer source sequence`);
+    }
+    const original = sourceClocks.get(index);
+    assert.ok(original, `${context}: missing original provider clock`);
+    assert.deepEqual({ nonce: original.nonce, markerCode: original.markerCode, index: original.index },
+      { nonce: token, markerCode, index }, `${context}: exact original emission clock join`);
+  }
+  const identities = new Set(deltas.map(delta => delta.identity)), indices = deltas.map(delta => delta.index);
+  assert.equal(identities.size, deltas.length, `Durable run ${runId}: duplicate normalized source identity tuple`);
+  assert.deepEqual(indices, Array.from({ length: stop ? deltas.length : events }, (_, index) => index),
+    `Durable run ${runId}: complete ordered ${stop ? 'canonical Stop prefix' : 'measured events'}`);
+  if (stop) {
+    const present = new Set(indices);
+    for (const item of visible) assert.ok(present.has(item.index),
+      `Durable run ${runId}: visible Stop marker ${item.index} must remain durable`);
+  } else assert.equal(sourceClocks.size, events, `Durable run ${runId}: complete source clock count`);
+  assert.equal(resultAcceptedEvents, stop ? 0 : 1, `Durable run ${runId}: exact accepted result count`);
+  return { runId, token, markerCode, individualDeltas: deltas.length, uniqueSourceIdentities: identities.size,
+    matchedSourceClocks: deltas.length, ordered: true, resultAcceptedEvents };
+}
+
+export function assertPreludeEvents({ rows, runId, token, expectedEvents }) {
+  const identities = new Set(); let count = 0;
+  for (const row of rows) {
+    const event = row.payload?.prpEvent;
+    if (event?.eventType !== 'item.delta' || !String(event.itemId ?? '').startsWith('prelude-')) continue;
+    assert.equal(event.payload?.text, count === expectedEvents - 1 ? ` PRELUDE_${token}_READY ` : '.',
+      `Prelude run ${runId} delta ${count}: complete normalized payload`);
+    count++; identities.add(`${event.sourceInstanceId}:${event.sourceEventId}:${event.sourceSeq}`);
+  }
+  assert.equal(count, expectedEvents, `Prelude run ${runId}: exact individually persisted delta count`);
+  assert.equal(identities.size, count, `Prelude run ${runId}: unique source identity tuples`);
+  return { individualDeltas: count, uniqueSourceIdentities: identities.size };
+}
+
+export function assertVisibleMarkerClocks({ seenMarkers, sourceClocks, markerCode, expectedEvents, stop }) {
+  const visible = seenMarkers.map(marker => {
+    const original = sourceClocks.get(marker.index);
+    assert.ok(original, `Missing original provider clock for visible ${marker.markerCode}:${marker.index}`);
+    return { ...original, ...marker }; // Retain the original two-frame paint timestamp.
+  });
+  if (!stop) assert.equal(new Set(visible.map(item => item.index)).size, expectedEvents,
+    `Visible marker ${markerCode}: complete unique foreground count`);
+  return visible;
+}
+
 export function assessH5Arm(report, owner) {
   assert.equal(report.protocolVersion, H5_PROTOCOL);
   assert.equal(report.observationMode, H5_MODE);
diff --git a/tests/e2e/native-event-ingestion.journey.ts b/tests/e2e/native-event-ingestion.journey.ts
index bcb49eedda3..d30e5efad1d 100644
--- a/tests/e2e/native-event-ingestion.journey.ts
+++ b/tests/e2e/native-event-ingestion.journey.ts
@@ -8,7 +8,8 @@ import path from "node:path";
 import { expect, test } from "@playwright/test";
 import { json } from "./agent-chat.shared";
 import { h5Enabled, H5_MODE, H5_PROTOCOL, H4E_PROTOCOL, H5_TOPOLOGY, H5_LIMITS, H5_WORKLOAD_SHA256, ORIGINAL_BUDGETS,
-  observeStreaming, observeRunSettlement, originalTerminal, prepareParticipantAgents, assertParticipantTopology, assertRecordedFailures } from "./fixtures/native-ingestion-h5.mjs";
+  observeStreaming, observeRunSettlement, originalTerminal, prepareParticipantAgents, assertParticipantTopology, assertRecordedFailures, collectDurableRunEvents, assertDurableRunEvents,
+  assertPreludeEvents, assertVisibleMarkerClocks } from "./fixtures/native-ingestion-h5.mjs";
 
 type SeenMarker = { markerCode: string; index: number; visibleMs: number };
 type Emission = { nonce: string; markerCode: string; index: number; intendedMs: number; emittedMs: number; receivedAtMs: number };
@@ -511,23 +512,18 @@ test("native ingestion reaches the shipped UI promptly and survives reload", asy
         const listed = await json(await request.get(`/api/companies/${company.id}/heartbeat-runs?limit=1000`));
         const foreground = listed.find((run: any) => (run.issueId ?? run.nativeIssueId ?? run.contextSnapshot?.issueId ?? run.contextSnapshot?.taskId) === issue.id);
         expect(foreground).toBeTruthy();
-        const identities = new Set<string>(); let count = 0, afterSeq = 0;
+        const preludeRows: any[] = []; let afterSeq = 0;
         while (true) {
           const rows = await json(await request.get(`/api/heartbeat-runs/${foreground.id}/events?afterSeq=${afterSeq}&limit=1000`));
           if (!rows.length) break;
-          for (const row of rows) {
-            const event = row.payload?.prpEvent;
-            if (event?.eventType !== "item.delta" || !String(event.itemId ?? "").startsWith("prelude-")) continue;
-            expect(event.payload?.text).toBe(count === workload.prelude - 1 ? ` PRELUDE_${nonce}_READY ` : ".");
-            count++; identities.add(`${event.sourceInstanceId}:${event.sourceEventId}:${event.sourceSeq}`);
-          }
+          preludeRows.push(...rows);
           const next = Math.max(...rows.map((row: { seq: number }) => row.seq));
           expect(next).toBeGreaterThan(afterSeq); afterSeq = next;
         }
-        preludeProof = { runId: foreground.id, individualDeltas: count, uniqueSourceIdentities: identities.size,
+        const checked = assertPreludeEvents({ rows: preludeRows, runId: foreground.id, token: nonce, expectedEvents: workload.prelude });
+        preludeProof = { runId: foreground.id, ...checked,
           retainedGlobalHead: afterSeq, verifiedAtMs: Date.now(), method: "Independent normal event API read before common emission gate release" };
         active.preludeProof = preludeProof;
-        expect(count).toBe(workload.prelude); expect(identities.size).toBe(count);
       }
       const controllerAuthority = await runtimeAuthority({
         appRoot, companyId: company.id, environmentId: caseEnvironment.id, issueIds, transport: caseTransport,
@@ -645,12 +641,8 @@ test("native ingestion reaches the shipped UI promptly and survives reload", asy
         ? seenMarkers.every(marker => state.streams.get(nonce)!.records.has(marker.index))
         : stream.records.size === workload.events && stream.ended)), { timeout: 30_000 }).toBe(true);
       expect(state.errors).toEqual([]);
-      const visible: Visible[] = seenMarkers.map(marker => {
-        const original = state.streams.get(nonce)!.records.get(marker.index);
-        expect(original, `Missing original provider clock for visible ${marker.markerCode}:${marker.index}`).toBeTruthy();
-        return { ...original!, ...marker }; // Keep the original paint timestamp; never restamp after clock arrival.
-      });
-      if (!stop) expect(new Set(visible.map(item => item.index)).size).toBe(workload.events);
+      const visible: Visible[] = assertVisibleMarkerClocks({ seenMarkers, sourceClocks: state.streams.get(nonce)!.records,
+        markerCode, expectedEvents: workload.events, stop });
       // Terminal drainage has finished. Derive paint gaps from the retained
       // observer timestamps without adding work to the streaming observer.
       const paintTimes = [...new Set(visible.map(item => item.visibleMs))].sort((a, b) => a - b);
@@ -693,39 +685,23 @@ test("native ingestion reaches the shipped UI promptly and survives reload", asy
         const token = issuedTokens.get(taskId)!;
         const code = state.streams.get(token)!.markerCode;
         expect(token).toBeTruthy();
-        const deltas: Array<{ index: number; identity: string }> = [];
-        let afterSeq = 0, resultAcceptedEvents = 0;
+        const persistedRows: any[] = [];
+        let afterSeq = 0;
+        active.verifyingRun = { runId: run.id, nonce: token, markerCode: code, afterSeq, rows: 0 };
         while (true) {
           const rows = await json(await request.get(`/api/heartbeat-runs/${run.id}/events?afterSeq=${afterSeq}&limit=1000`));
           if (!rows.length) break;
-          for (const row of rows) {
-            const event = row.payload?.prpEvent;
-            if (row.eventType === "run.result.accepted" || event?.eventType === "run.result.accepted") resultAcceptedEvents++;
-            if (event?.eventType !== "item.delta") continue;
-            for (const match of String(event.payload?.text ?? "").matchAll(new RegExp(`\\[${code}([a-z0-9]{1,3})\\]`, "g"))) {
-              const index = Number.parseInt(match[1], 36);
-              expect(event.payload.text, "Every durable normalized delta retains its complete compact payload").toBe(`[${code}${index.toString(36)}] `);
-              if (h5) { expect(event.runId).toBe(run.id); expect(event.sourceInstanceId).toBeTruthy();
-                expect(event.sourceEventId).toBeTruthy(); expect(Number.isSafeInteger(event.sourceSeq) && event.sourceSeq > 0).toBe(true); }
-              deltas.push({ index, identity: `${event.sourceInstanceId}:${event.sourceEventId}:${event.sourceSeq}` });
-            }
-          }
+          persistedRows.push(...rows);
           const next = Math.max(...rows.map((row: { seq: number }) => row.seq));
           expect(next).toBeGreaterThan(afterSeq); afterSeq = next;
+          active.verifyingRun = { runId: run.id, nonce: token, markerCode: code, afterSeq, rows: persistedRows.length };
         }
-        active.latestDurableRead = { runId: run.id, nonce: token, markerCode: code, deltas };
-        await expect.poll(() => deltas.every(delta => state.streams.get(token)!.records.has(delta.index)), { timeout: 30_000 }).toBe(true);
-        for (const delta of deltas) {
-          const original = state.streams.get(token)!.records.get(delta.index)!;
-          expect({ nonce: original.nonce, markerCode: original.markerCode, index: original.index })
-            .toEqual({ nonce: token, markerCode: code, index: delta.index });
-        }
-        expect(new Set(deltas.map(item => item.identity)).size).toBe(deltas.length);
-        expect(deltas.map(item => item.index)).toEqual(Array.from({ length: stop ? deltas.length : workload.events }, (_, index) => index));
-        if (stop) for (const item of visible) expect(deltas.some(delta => delta.index === item.index)).toBe(true);
-        expect(resultAcceptedEvents).toBe(stop ? 0 : 1);
-        durable.push({ runId: run.id, token, markerCode: code, individualDeltas: deltas.length, uniqueSourceIdentities: deltas.length,
-          matchedSourceClocks: deltas.length, ordered: true, resultAcceptedEvents });
+        const collected = collectDurableRunEvents(persistedRows, code);
+        active.latestDurableRead = { runId: run.id, nonce: token, markerCode: code,
+          deltas: collected.deltas.map(({ index, identity }) => ({ index, identity })) };
+        await expect.poll(() => collected.deltas.every(delta => state.streams.get(token)!.records.has(delta.index)), { timeout: 30_000 }).toBe(true);
+        durable.push(assertDurableRunEvents({ collected, runId: run.id, token, markerCode: code, events: workload.events, stop,
+          sourceClocks: state.streams.get(token)!.records, visible, requireNativeIdentity: h5 }));
       }
       await expect.poll(() => [...state.streams.values()].every(stream => stream.ended || stream.aborted), { timeout: 30_000 }).toBe(true);
       expect(state.errors).toEqual([]);