diff --git a/scripts/src/hwlab-node-web-observe-analyzer-source.ts b/scripts/src/hwlab-node-web-observe-analyzer-source.ts
index 178b19e1..58baf930 100644
--- a/scripts/src/hwlab-node-web-observe-analyzer-source.ts
+++ b/scripts/src/hwlab-node-web-observe-analyzer-source.ts
@@ -3039,6 +3039,44 @@ function workbenchTriadMismatchKind(row) {
   return "unknown";
 }
 
+function workbenchTriadRootCauseFromDrilldown(drilldown, summary = {}) {
+  const groups = Array.isArray(drilldown?.groups) ? drilldown.groups : [];
+  const hasStaleCompletedRail = groups.some((group) => group?.mismatchKind === "rail-card-status-mismatch" && String(group?.statusTuple || "").includes("rail=completed,card=running,final=false"));
+  if (hasStaleCompletedRail) return {
+    rootCause: "workbench_session_rail_status_stale_after_new_running_turn",
+    rootCauseStatus: "confirmed-from-dom-samples",
+    rootCauseConfidence: "high",
+    dominantMismatchKind: "rail-card-status-mismatch",
+    summary: "Workbench session rail kept the previous completed terminal status while a newer turn card was running and Final Response was absent",
+    nextAction: "Inspect HWLAB frontend session status authority/reducer, especially workbench-server-state sessionStatusAuthorityFromMessages and SessionRail sessionToSessionTab status input; session rail must derive from the latest active turn/message authority rather than the previous sealed terminal message.",
+    sourceOfTruth: "latest durable Workbench turn/message projection for the active session",
+    valuesRedacted: true,
+  };
+  const finalMismatchCount = Number(summary?.cardFinalResponseMismatchCount ?? 0);
+  const hasFinalMismatch = finalMismatchCount > 0 || groups.some((group) => /final=false/u.test(String(group?.statusTuple || "")) && group?.mismatchKind !== "rail-card-status-mismatch");
+  if (hasFinalMismatch) return {
+    rootCause: "workbench_terminal_final_response_not_sealed",
+    rootCauseStatus: "confirmed-from-dom-samples",
+    rootCauseConfidence: "high",
+    dominantMismatchKind: "completed-card-final-response-absent",
+    summary: "Workbench terminal turn card did not expose a structured Final Response body",
+    nextAction: "Inspect HWLAB terminal message/finalResponse projection contract before changing renderer fallback behavior.",
+    sourceOfTruth: "durable Workbench terminal message projection",
+    valuesRedacted: true,
+  };
+  const mismatchKinds = Array.isArray(drilldown?.summary?.mismatchKinds) ? drilldown.summary.mismatchKinds : [];
+  return {
+    rootCause: "workbench_projection_state_triad_not_sealed",
+    rootCauseStatus: "confirmed-from-dom-samples",
+    rootCauseConfidence: "high",
+    dominantMismatchKind: mismatchKinds[0] ?? "unknown",
+    summary: "Workbench session rail status, turn card status, and Final Response body presence diverged from the allowed state tuples",
+    nextAction: "Use drilldown.otelDrilldown.commands for the listed traceIds, then inspect staticSourceHints and add unit tests from unitTestReproHints before changing UI rendering.",
+    sourceOfTruth: "durable Workbench projection/read model",
+    valuesRedacted: true,
+  };
+}
+
 function workbenchTriadTuple(row) {
   return [
     "rail=" + (row?.railStatus ?? "-"),
@@ -3082,6 +3120,7 @@ function workbenchTriadStaticSourceHints() {
 
 function workbenchTriadUnitTestReproHints() {
   return [
+    "frontend reducer: when a second trace is running in the same session, session rail status must not stay on the previous completed terminal trace",
     "backend projector: terminal event must produce a single sealed turn tuple consumed by session list, session detail, messages and turn-status APIs",
     "backend read model: completed rail status must not coexist with running turn card or missing Final Response for the same trace",
     "frontend server-state merge: stale running/empty snapshots must not overwrite a sealed completed+Final Response turn",
@@ -3194,6 +3233,7 @@ function normalizeWorkbenchTriadStatus(status, running = false) {
   if (running === true) return "running";
   if (!value) return null;
   if (/^(completed|complete|succeeded|success|finished|done|terminal|sealed)$/u.test(value)) return "completed";
+  if (/^(failed|failure|error|blocked|timeout|canceled|cancelled|stale|thread-resume-failed|interrupted|expired|idle)$/u.test(value)) return "completed";
   if (/^(pending|running|active|busy|admitted|dispatching|executing|streaming|processing|queued|in-progress|creating)$/u.test(value)) return "running";
   return null;
 }
@@ -3364,30 +3404,35 @@ function buildFindings(samples, control, network, errors, sampleMetrics, promptN
     ...(Array.isArray(turnStateTriad.invalidFullTriads) ? turnStateTriad.invalidFullTriads : []),
     ...(Array.isArray(turnStateTriad.cardFinalResponseMismatches) ? turnStateTriad.cardFinalResponseMismatches : [])
   ];
-  if (Number(turnStateTriadSummary.invalidRowCount ?? 0) > 0) findings.push({
-    id: "workbench-turn-state-triad-inconsistent",
-    severity: "red",
-    summary: "Workbench session rail status, turn card status, and Final Response body presence diverged from the allowed running/running/absent or completed/completed/present tuples",
-    count: turnStateTriadSummary.invalidRowCount,
-    fullTriadCount: turnStateTriadSummary.fullTriadRowCount,
-    invalidFullTriadCount: turnStateTriadSummary.invalidFullTriadCount,
-    cardFinalResponseMismatchCount: turnStateTriadSummary.cardFinalResponseMismatchCount,
-    legacyCollectorMissingCount: turnStateTriadSummary.collectorMissingRowCount,
-    collectorMissingFields: Array.isArray(turnStateTriadSummary.collectorMissingFields) ? turnStateTriadSummary.collectorMissingFields : [],
-    allowedTuples: [
-      { railStatus: "completed", cardStatus: "completed", finalResponsePresent: true },
-      { railStatus: "running", cardStatus: "running", finalResponsePresent: false }
-    ],
-    samples: turnStateTriadRows.slice(0, 20),
-    drilldown: turnStateTriad.drilldown ?? buildWorkbenchTurnStateTriadDrilldown(turnStateTriadRows),
-    collectorMissingSamples: Array.isArray(turnStateTriad.collectorMissingRows) ? turnStateTriad.collectorMissingRows.slice(0, 10) : [],
-    sourceOfTruth: "durable Workbench projection/read model; do not repair via DOM fallback or GET-side state mutation",
-    nextAction: "Use drilldown.otelDrilldown.commands for the listed traceIds, then inspect staticSourceHints and add unit tests from unitTestReproHints before changing UI rendering.",
-    rootCause: "workbench_projection_state_triad_not_sealed",
-    rootCauseStatus: "confirmed-from-dom-samples",
-    rootCauseConfidence: "high",
-    valuesRedacted: true
-  });
+  if (Number(turnStateTriadSummary.invalidRowCount ?? 0) > 0) {
+    const drilldown = turnStateTriad.drilldown ?? buildWorkbenchTurnStateTriadDrilldown(turnStateTriadRows);
+    const rootCause = workbenchTriadRootCauseFromDrilldown(drilldown, turnStateTriadSummary);
+    findings.push({
+      id: "workbench-turn-state-triad-inconsistent",
+      severity: "red",
+      summary: rootCause.summary,
+      count: turnStateTriadSummary.invalidRowCount,
+      fullTriadCount: turnStateTriadSummary.fullTriadRowCount,
+      invalidFullTriadCount: turnStateTriadSummary.invalidFullTriadCount,
+      cardFinalResponseMismatchCount: turnStateTriadSummary.cardFinalResponseMismatchCount,
+      legacyCollectorMissingCount: turnStateTriadSummary.collectorMissingRowCount,
+      collectorMissingFields: Array.isArray(turnStateTriadSummary.collectorMissingFields) ? turnStateTriadSummary.collectorMissingFields : [],
+      dominantMismatchKind: rootCause.dominantMismatchKind,
+      allowedTuples: [
+        { railStatus: "completed", cardStatus: "completed", finalResponsePresent: true },
+        { railStatus: "running", cardStatus: "running", finalResponsePresent: false }
+      ],
+      samples: turnStateTriadRows.slice(0, 20),
+      drilldown,
+      collectorMissingSamples: Array.isArray(turnStateTriad.collectorMissingRows) ? turnStateTriad.collectorMissingRows.slice(0, 10) : [],
+      sourceOfTruth: rootCause.sourceOfTruth + "; do not repair via DOM fallback or GET-side state mutation",
+      nextAction: rootCause.nextAction,
+      rootCause: rootCause.rootCause,
+      rootCauseStatus: rootCause.rootCauseStatus,
+      rootCauseConfidence: rootCause.rootCauseConfidence,
+      valuesRedacted: true
+    });
+  }
   const promptFailures = Array.isArray(promptNetwork?.rounds) ? promptNetwork.rounds.filter((item) => item.chatPostOk === false && !promptCommandHasAuthoritativeSubmitSideEffect(control, item)) : [];
   if (promptFailures.length > 0) findings.push({ id: "prompt-chat-submit-failed", severity: "red", summary: "sendPrompt command had no successful /v1/agent/chat or /v1/agent/chat/steer POST response in the sampling window", count: promptFailures.length, rounds: promptFailures.slice(0, 10) });
   const promptSteerRounds = Array.isArray(promptNetwork?.rounds) ? promptNetwork.rounds.filter((item) => item.steerUsed === true) : [];
diff --git a/scripts/src/hwlab-node/web-observe-analyzer-triad.test.ts b/scripts/src/hwlab-node/web-observe-analyzer-triad.test.ts
new file mode 100644
index 00000000..75157480
--- /dev/null
+++ b/scripts/src/hwlab-node/web-observe-analyzer-triad.test.ts
@@ -0,0 +1,158 @@
+import assert from "node:assert/strict";
+import { mkdtemp, readFile, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { spawnSync } from "node:child_process";
+import { test } from "bun:test";
+
+import { nodeWebObserveAnalyzerSource } from "../hwlab-node-web-observe-analyzer-source";
+
+const alertThresholds = {
+  sameOriginApiSlowMs: 60000,
+  partialApiSlowMs: 60000,
+  longLivedStreamOpenSlowMs: 60000,
+  visibleLoadingSlowMs: 60000,
+  turnTimingSampleSlackSeconds: 60,
+  turnElapsedSevereTimeoutSeconds: 3600,
+  domEvaluateTimeoutRedCount: 99,
+  domEvaluateTimeoutRedWindowMs: 60000,
+  screenshotTimeoutRedCount: 99,
+  pageErrorRedCount: 99,
+  browserProcessSampleIntervalMs: 1000,
+  browserTotalRssRedMb: 999999,
+  browserProcessRssRedMb: 999999,
+  browserRssGrowthRedMb: 999999,
+  browserRssGrowthWindowMs: 60000,
+  playwrightResponsivenessRedMs: 60000,
+  playwrightResponsivenessTimeoutRedCount: 99,
+  cdpMetricsTimeoutRedCount: 99,
+  uncommandedStateChangeCommandWindowMs: 1000,
+  scrollJumpCommandWindowMs: 1000,
+  scrollJumpFromY: 999999,
+  scrollJumpToY: 999999,
+  sessionRailFallbackRatio: 0.5,
+};
+
+const browserFreezePolicy = {
+  enabled: true,
+  blockerWindowMs: 60000,
+  memory: {
+    totalRssBlockerMb: 999999,
+    processRssBlockerMb: 999999,
+    growthBlockerMb: 999999,
+  },
+  responsiveness: {
+    latencyBlockerMs: 60000,
+    eventBlockerCount: 99,
+  },
+  cdp: {
+    metricsTimeoutBlockerCount: 99,
+  },
+  kill: {
+    enabled: false,
+    gracefulSignal: "SIGTERM",
+    forceSignal: "SIGKILL",
+    graceMs: 1000,
+    pollIntervalMs: 100,
+    exitCode: 124,
+  },
+};
+
+test("observe analyzer classifies stale completed session rail when a newer turn is running", async () => {
+  const stateDir = await mkdtemp(join(tmpdir(), "unidesk-web-observe-analyzer-"));
+  const analyzerPath = join(stateDir, "analyze.mjs");
+  const samplesPath = join(stateDir, "samples.jsonl");
+  await writeFile(analyzerPath, nodeWebObserveAnalyzerSource(), { mode: 0o700 });
+  await writeFile(samplesPath, [
+    JSON.stringify({
+      seq: 1,
+      ts: "2026-07-01T15:21:24.767Z",
+      path: "/workbench/sessions/ses_triage",
+      url: "https://hwlab.example.test/workbench/sessions/ses_triage",
+      pageRole: "control",
+      pageId: "control-test",
+      routeSessionId: "ses_triage",
+      activeSessionId: "ses_triage",
+      sessionRail: {
+        items: [{
+          index: 0,
+          active: true,
+          status: "completed",
+          dataStatus: "completed",
+          running: false,
+          dataRunning: "false",
+          sessionId: "ses_triage",
+          sessionIdPrefix: "ses_triage",
+        }],
+      },
+      turns: [
+        {
+          role: "agent",
+          status: "completed",
+          traceId: "trc_previous_completed",
+          messageId: "msg_previous_completed_agent",
+          finalResponsePresent: true,
+          finalResponseTextBytes: 12,
+        },
+        {
+          role: "agent",
+          status: "running",
+          traceId: "trc_running_new_turn",
+          messageId: "msg_running_new_turn_agent",
+          finalResponsePresent: false,
+          finalResponseTextBytes: 0,
+        },
+      ],
+    }),
+    JSON.stringify({
+      seq: 2,
+      ts: "2026-07-01T15:22:49.918Z",
+      path: "/workbench/sessions/ses_triage",
+      url: "https://hwlab.example.test/workbench/sessions/ses_triage",
+      pageRole: "control",
+      pageId: "control-test",
+      routeSessionId: "ses_triage",
+      activeSessionId: "ses_triage",
+      sessionRail: {
+        items: [{
+          index: 0,
+          active: true,
+          status: "canceled",
+          dataStatus: "canceled",
+          running: false,
+          dataRunning: "false",
+          sessionId: "ses_triage",
+          sessionIdPrefix: "ses_triage",
+        }],
+      },
+      turns: [{
+        role: "agent",
+        status: "canceled",
+        traceId: "trc_canceled_terminal",
+        messageId: "msg_canceled_terminal_agent",
+        finalResponsePresent: true,
+        finalResponseTextBytes: 17,
+      }],
+    }),
+  ].join("\n") + "\n");
+
+  const result = spawnSync("bun", [analyzerPath, stateDir], {
+    cwd: join(import.meta.dir, "../../.."),
+    env: {
+      ...process.env,
+      UNIDESK_WEB_OBSERVE_ANALYZE_TAIL_SAMPLES: "0",
+      UNIDESK_WEB_OBSERVE_ALERT_THRESHOLDS_JSON: JSON.stringify(alertThresholds),
+      UNIDESK_WEB_OBSERVE_BROWSER_FREEZE_POLICY_JSON: JSON.stringify(browserFreezePolicy),
+    },
+    encoding: "utf8",
+  });
+  assert.equal(result.status, 0, result.stderr || result.stdout);
+
+  const report = JSON.parse(await readFile(join(stateDir, "analysis", "report.json"), "utf8"));
+  const finding = report.findings.find((item: Record<string, unknown>) => item.id === "workbench-turn-state-triad-inconsistent");
+  assert.equal(finding?.rootCause, "workbench_session_rail_status_stale_after_new_running_turn");
+  assert.equal(finding?.dominantMismatchKind, "rail-card-status-mismatch");
+  assert.match(String(finding?.summary), /previous completed terminal status/u);
+  assert.equal(report.sampleMetrics.workbenchTurnStateTriad.summary.invalidRowCount, 1);
+  assert.equal(report.sampleMetrics.workbenchTurnStateTriad.summary.cardFinalResponseMismatchCount, 0);
+}, 20_000);
diff --git a/scripts/src/platform-infra-observability/apply-status-scripts.ts b/scripts/src/platform-infra-observability/apply-status-scripts.ts
index 70f54e49..62d19c00 100644
--- a/scripts/src/platform-infra-observability/apply-status-scripts.ts
+++ b/scripts/src/platform-infra-observability/apply-status-scripts.ts
@@ -89,6 +89,7 @@ export function compactDiagnoseCodeAgentResult(value: unknown): Record<string, u
     servicePath: source.servicePath ?? null,
     observabilityGap: source.observabilityGap ?? null,
     businessTraceIds: source.businessTraceIds ?? null,
+    businessTraceScope: source.businessTraceScope ?? null,
     identity: compactDiagnoseIdentity(source.identity),
     agentrun: compactDiagnoseAgentRun(source.agentrun),
     hwlabReadModel: source.hwlabReadModel ?? null,
diff --git a/scripts/src/platform-infra-observability/diagnose-code-agent-script.ts b/scripts/src/platform-infra-observability/diagnose-code-agent-script.ts
index 59e19da3..cc67ce9c 100644
--- a/scripts/src/platform-infra-observability/diagnose-code-agent-script.ts
+++ b/scripts/src/platform-infra-observability/diagnose-code-agent-script.ts
@@ -1450,6 +1450,88 @@ def identity_from_spans(spans):
             identity[key] = preferred if preferred is not None else fallback
     return identity
 
+def span_business_trace_id(item):
+    attrs = item.get("attributes", {}) if isinstance(item.get("attributes"), dict) else {}
+    for key in ("traceId", "workbench.trace_id", "workbench.turn_id"):
+        value = attrs.get(key)
+        if isinstance(value, str) and value.strip().startswith("trc_"):
+            return value.strip()
+    return None
+
+def span_identity_value(item, key):
+    attrs = item.get("attributes", {}) if isinstance(item.get("attributes"), dict) else {}
+    value = attrs.get(key)
+    if value in (None, ""):
+        return None
+    return str(value)
+
+def span_matches_scope_identity(item, identity):
+    if not isinstance(identity, dict):
+        return False
+    # Only strong per-turn identities are safe enough for no-trace-id spans.
+    # runId/sessionId/runnerJobId can cover several turns in the same Workbench
+    # session and caused terminal status leakage across business trace ids.
+    for key in ("commandId", "turnId"):
+        scoped = identity.get(key)
+        value = span_identity_value(item, key)
+        if scoped not in (None, "") and value not in (None, ""):
+            return str(scoped) == str(value)
+    return False
+
+def scoped_spans_for_business_trace(spans, business_trace_id):
+    if business_trace_id in (None, ""):
+        return list(spans), {
+            "mode": "unscoped-no-business-trace-id",
+            "requestedBusinessTraceId": None,
+            "totalSpanCount": len(spans),
+            "scopedSpanCount": len(spans),
+            "excludedDifferentTraceSpanCount": 0,
+            "includedNoTraceIdentitySpanCount": 0,
+            "crossBusinessTraceIds": [],
+        }
+    exact = []
+    no_trace = []
+    cross_ids = collections.Counter()
+    for item in spans:
+        trace_id = span_business_trace_id(item)
+        if trace_id == business_trace_id:
+            exact.append(item)
+        elif trace_id:
+            cross_ids[trace_id] += 1
+        else:
+            no_trace.append(item)
+    if not exact:
+        return list(spans), {
+            "mode": "unscoped-no-exact-business-trace-span",
+            "requestedBusinessTraceId": business_trace_id,
+            "totalSpanCount": len(spans),
+            "scopedSpanCount": len(spans),
+            "excludedDifferentTraceSpanCount": 0,
+            "includedNoTraceIdentitySpanCount": 0,
+            "crossBusinessTraceIds": [{"traceId": key, "count": count} for key, count in cross_ids.most_common(8)],
+        }
+    identity = identity_from_spans(exact)
+    exact_ids = set(id(item) for item in exact)
+    scoped = list(exact)
+    included_no_trace = 0
+    for item in no_trace:
+        if id(item) in exact_ids:
+            continue
+        if span_matches_scope_identity(item, identity):
+            scoped.append(item)
+            included_no_trace += 1
+    scoped.sort(key=lambda item: (item.get("_start", 0), item.get("_index", 0)))
+    return scoped, {
+        "mode": "business-trace-scoped",
+        "requestedBusinessTraceId": business_trace_id,
+        "totalSpanCount": len(spans),
+        "scopedSpanCount": len(scoped),
+        "excludedDifferentTraceSpanCount": len(spans) - len(scoped),
+        "includedNoTraceIdentitySpanCount": included_no_trace,
+        "scopeIdentity": {key: identity.get(key) for key in ("commandId", "turnId", "runId", "sessionId") if identity.get(key) not in (None, "")},
+        "crossBusinessTraceIds": [{"traceId": key, "count": count} for key, count in cross_ids.most_common(8)],
+    }
+
 def flatten_trace(trace_body):
     services = set()
     business_trace_ids = set()
@@ -1752,6 +1834,20 @@ def root_cause_candidates(http_summary, agentrun, read_model, lag_summary, error
             "evidence": lag_summary.get("reasons", []),
         })
     failure_kind = str(agentrun.get("failureKind") or "")
+    read_model_turn_status = read_model.get("turnStatus")
+    status_conflict = terminal_status_conflicts(agentrun.get("terminalStatus"), read_model_turn_status)
+    if status_conflict:
+        candidates.append({
+            "code": "otel_business_trace_terminal_conflict",
+            "label": "OTel terminal conflict",
+            "confidence": 0.86,
+            "summary": "Scoped AgentRun terminal status conflicts with HWLAB read-model turn status for the requested business trace; prefer the HWLAB read-model status for Workbench RCA and inspect OTel correlation leakage.",
+            "evidence": {
+                "agentrunTerminalStatus": agentrun.get("terminalStatus"),
+                "hwlabReadModelTurnStatus": read_model_turn_status,
+                "turnStatusCounts": read_model.get("turnStatusCounts"),
+            },
+        })
     if failure_kind == "provider-auth-failed":
         candidates.append({
             "code": "provider_auth_failed",
@@ -1765,7 +1861,7 @@ def root_cause_candidates(http_summary, agentrun, read_model, lag_summary, error
                 "terminalCategory": agentrun.get("terminalCategory"),
             },
         })
-    if agentrun.get("terminalStatus") in ("failed", "error", "timeout", "blocked", "cancelled"):
+    if agentrun.get("terminalStatus") in ("failed", "error", "timeout", "blocked", "cancelled") and not status_conflict:
         candidates.append({
             "code": "agentrun_terminal_failed",
             "label": "AgentRun terminal failed",
@@ -1790,6 +1886,19 @@ def root_cause_candidates(http_summary, agentrun, read_model, lag_summary, error
                 "runnerProviderClassification": agentrun.get("runnerProviderClassification"),
             },
         })
+    if agentrun.get("terminalStatus") in (None, "") and read_model_turn_status in ("completed", "failed", "error", "timeout", "blocked", "cancelled", "canceled"):
+        candidates.append({
+            "code": "hwlab_read_model_terminal_without_runner_spans",
+            "label": "HWLAB read model terminal",
+            "confidence": 0.7,
+            "summary": "HWLAB read model shows a terminal turn status but scoped AgentRun manager/runner terminal spans are absent; treat missing runner spans as an observability gap, not proof that the turn is still running.",
+            "evidence": {
+                "turnStatus": read_model_turn_status,
+                "turnStatusCounts": read_model.get("turnStatusCounts"),
+                "sessionListReadCount": read_model.get("sessionListReadCount"),
+                "sessionMessageReadCount": read_model.get("sessionMessageReadCount"),
+            },
+        })
     if error_spans and agentrun.get("terminalStatus") == "completed":
         candidates.append({
             "code": "tool_call_failures_recovered",
@@ -1812,6 +1921,28 @@ def root_cause_candidates(http_summary, agentrun, read_model, lag_summary, error
     candidates.sort(key=lambda item: item.get("confidence", 0), reverse=True)
     return candidates
 
+def comparable_terminal_status(value):
+    text = str(value or "").strip().lower().replace("_", "-")
+    if not text:
+        return None
+    if text == "cancelled":
+        return "canceled"
+    if text == "success" or text == "succeeded" or text == "complete":
+        return "completed"
+    if text == "error" or text == "failure":
+        return "failed"
+    return text
+
+def terminal_status_conflicts(left, right):
+    left_status = comparable_terminal_status(left)
+    right_status = comparable_terminal_status(right)
+    if left_status in (None, "") or right_status in (None, ""):
+        return False
+    terminal_values = {"completed", "failed", "timeout", "blocked", "canceled", "stale", "thread-resume-failed", "interrupted", "expired"}
+    if left_status not in terminal_values or right_status not in terminal_values:
+        return False
+    return left_status != right_status
+
 def candidate_score(trace_id, meta, trace_body, trace_rc, trace_err):
     parsed = parse_json(trace_body)
     meta_root_service = str(meta.get("rootServiceName") or "") if isinstance(meta, dict) else ""
@@ -1837,13 +1968,15 @@ def candidate_score(trace_id, meta, trace_body, trace_rc, trace_err):
             "stderrTail": (trace_err or "")[-1000:],
         }, None
     flat = flatten_trace(parsed)
-    spans = flat["spans"]
-    services = set(flat["services"])
+    all_spans = flat["spans"]
+    spans, business_scope = scoped_spans_for_business_trace(all_spans, BUSINESS_TRACE_ID)
+    services = set(str(item.get("service") or "") for item in spans)
     names = [str(item.get("name") or "") for item in spans]
     lowered_names = [name.lower() for name in names]
     identity = identity_from_spans(spans)
     agentrun = agentrun_summary(spans)
-    error_spans = flat["errorSpans"]
+    scoped_span_ids = set(id(item) for item in spans)
+    error_spans = [item for item in flat["errorSpans"] if id(item) in scoped_span_ids]
     score = 0
     reasons = []
     def add(points, reason):
@@ -1902,6 +2035,7 @@ def candidate_score(trace_id, meta, trace_body, trace_rc, trace_err):
         "identity": {key: identity.get(key) for key in ("runId", "commandId", "sessionId", "runnerJobId", "runnerId", "backendProfile") if identity.get(key) not in (None, "")},
         "terminalStatus": agentrun.get("terminalStatus"),
         "errorSpanCount": len(error_spans),
+        "businessTraceScope": business_scope,
         "candidateQuality": candidate_quality,
         "lowConfidence": candidate_quality != "normal",
         "rootTraceName": meta_root_name or None,
@@ -2043,10 +2177,12 @@ if not isinstance(trace_parsed, dict):
     raise SystemExit(1)
 
 flat = flatten_trace(trace_parsed)
-spans = flat["spans"]
-services = flat["services"]
+all_spans = flat["spans"]
+spans, business_scope = scoped_spans_for_business_trace(all_spans, BUSINESS_TRACE_ID)
+services = sorted(set(str(item.get("service") or "") for item in spans))
 business_trace_ids = flat["businessTraceIds"]
-error_spans = flat["errorSpans"]
+scoped_span_ids = set(id(item) for item in spans)
+error_spans = [item for item in flat["errorSpans"] if id(item) in scoped_span_ids]
 idle_warning_spans = [item for item in spans if str(item.get("name") or "") == "codex_stdio.idle_warning"]
 http_summary = http_status_summary(spans)
 read_model = hwlab_read_model_summary(spans)
@@ -2080,17 +2216,25 @@ if missing_services and ("hwlab-cloud-api" in services or identity.get("runId")
 facts = []
 if missing_services:
     facts.append("observability gap: missing service spans " + ",".join(missing_services))
+if business_scope.get("mode") == "business-trace-scoped" and business_scope.get("crossBusinessTraceIds"):
+    facts.append("cross-business-trace spans excluded")
 if http_summary.get("actorForbidden"):
     facts.append("actor forbidden")
 terminal_status = agentrun.get("terminalStatus")
-if terminal_status in ("failed", "error", "timeout", "blocked", "cancelled"):
+read_model_turn_status = read_model.get("turnStatus")
+agentrun_read_model_status_conflict = terminal_status_conflicts(terminal_status, read_model_turn_status)
+if agentrun_read_model_status_conflict:
+    facts.append("OTel AgentRun terminal status conflicts with HWLAB read model")
+if terminal_status in ("failed", "error", "timeout", "blocked", "cancelled") and not agentrun_read_model_status_conflict:
     failure_kind = agentrun.get("failureKind")
     if failure_kind:
         facts.append(f"AgentRun terminal failed ({failure_kind})")
     else:
         facts.append("AgentRun terminal failed")
-if terminal_status == "completed":
+if terminal_status == "completed" and not agentrun_read_model_status_conflict:
     facts.append("AgentRun completed")
+if (terminal_status in (None, "") or agentrun_read_model_status_conflict) and read_model_turn_status in ("completed", "failed", "error", "timeout", "blocked", "cancelled", "canceled"):
+    facts.append("HWLAB read model terminal " + str(read_model_turn_status))
 if lag.get("status") in ("confirmed", "suspected"):
     facts.append("projection/read-model stale")
 if idle_warning_spans and terminal_status in (None, ""):
@@ -2105,8 +2249,11 @@ summary = {
         "runnerProvider": agentrun.get("runnerProviderClassification"),
         "actorForbidden": http_summary.get("actorForbidden"),
         "terminalStatus": terminal_status,
+        "readModelTurnStatus": read_model_turn_status,
+        "agentrunReadModelStatusConflict": agentrun_read_model_status_conflict,
         "failureKind": agentrun.get("failureKind"),
         "observabilityGap": observability_gap.get("status"),
+        "businessTraceScope": business_scope.get("mode"),
     },
 }
 evidence = {
@@ -2136,6 +2283,7 @@ payload = {
     "servicePath": service_path,
     "observabilityGap": observability_gap,
     "businessTraceIds": business_trace_ids[:20],
+    "businessTraceScope": business_scope,
     "identity": identity,
     "agentrun": {
         "terminalStatus": agentrun.get("terminalStatus"),