diff --git a/scripts/src/hwlab-node-impl.ts b/scripts/src/hwlab-node-impl.ts
index 55f54d7c..19c5149c 100644
--- a/scripts/src/hwlab-node-impl.ts
+++ b/scripts/src/hwlab-node-impl.ts
@@ -8873,7 +8873,8 @@ function runNodeWebProbeObserveAnalyze(options: NodeWebProbeObserveOptions, spec
   });
 }
 
-function recoverWebObserveAnalyzeTurnDetails(options: NodeWebProbeObserveOptions, spec: HwlabRuntimeLaneSpec, analysis: Record<string, unknown>): Record<string, unknown> {
+function recoverWebObserveAnalyzeTurnDetails(options: NodeWebProbeObserveOptions, spec: HwlabRuntimeLaneSpec, analysis: Record<string, unknown> | null): Record<string, unknown> | null {
+  if (analysis === null || typeof analysis !== "object") return analysis;
   const sampleMetrics = record(analysis.sampleMetrics);
   const hasRounds = Array.isArray(sampleMetrics?.rounds) && sampleMetrics.rounds.length > 0;
   const hasColumns = Array.isArray(sampleMetrics?.turnColumns) && sampleMetrics.turnColumns.length > 0;
diff --git a/scripts/src/hwlab-node-web-observe-runner-source.ts b/scripts/src/hwlab-node-web-observe-runner-source.ts
index b560b74a..beb22e25 100644
--- a/scripts/src/hwlab-node-web-observe-runner-source.ts
+++ b/scripts/src/hwlab-node-web-observe-runner-source.ts
@@ -2046,7 +2046,12 @@ import { createInterface } from "node:readline";
 
 const stateDir = path.resolve(process.env.UNIDESK_WEB_OBSERVE_STATE_DIR || process.argv[2] || ".state/web-observe/manual");
 const archivePrefix = safeArchivePrefix(process.env.UNIDESK_WEB_OBSERVE_ANALYZE_ARCHIVE_PREFIX || "");
-const analyzeTailSamples = (() => { const parsed = Number(process.env.UNIDESK_WEB_OBSERVE_ANALYZE_TAIL_SAMPLES); return Number.isFinite(parsed) && parsed >= 0 ? Math.floor(parsed) : 360; })();
+const analyzeTailSamples = (() => {
+  const raw = process.env.UNIDESK_WEB_OBSERVE_ANALYZE_TAIL_SAMPLES;
+  if (raw === undefined || raw === null || String(raw).trim() === "") return 360;
+  const parsed = Number(raw);
+  return Number.isFinite(parsed) && parsed >= 0 ? Math.floor(parsed) : 360;
+})();
 const alertThresholds = parseAlertThresholds(process.env.UNIDESK_WEB_OBSERVE_ALERT_THRESHOLDS_JSON);
 const dataDir = archivePrefix ? path.join(stateDir, "archive") : stateDir;
 const dataFile = (name) => path.join(dataDir, archivePrefix ? archivePrefix + "-" + name : name);
@@ -3978,6 +3983,8 @@ function buildSampleMetrics(samples, control) {
   const diagnostics = timeline.filter((item) => item.diagnosticSeen).length;
   const loading = buildLoadingMetrics(samples, timeline);
   const sessionRailTitles = buildSessionRailTitleMetrics(samples, timeline);
+  const reportTurnTimingRows = boundedTurnTimingRowsForReport(turnTiming.rows);
+  const reportTimeline = boundedRowsForReport(timeline);
   const rounds = buildRoundMetricSummaries(timeline, promptCommands, {
     columns: turnTiming.columns,
     rows: turnTiming.rows,
@@ -4053,7 +4060,8 @@ function buildSampleMetrics(samples, control) {
     traceOrder,
     rounds,
     turnColumns: turnTiming.columns,
-    turnTimingTable: turnTiming.rows,
+    turnTimingTable: reportTurnTimingRows.rows,
+    turnTimingTableDisclosure: reportTurnTimingRows.disclosure,
     turnTimingNonMonotonic,
     turnTimingElapsedZeroResets,
     turnTimingTotalElapsedForwardJumps,
@@ -4062,7 +4070,29 @@ function buildSampleMetrics(samples, control) {
     turnTimingRecentUpdateSteps,
     turnTimingRecentUpdateLargestSteps,
     turnTimingRecentUpdateResets,
-    timeline
+    timeline: reportTimeline.rows,
+    timelineDisclosure: reportTimeline.disclosure
+  };
+}
+
+function boundedRowsForReport(rows) {
+  const sourceRows = Array.isArray(rows) ? rows : [];
+  const maxRows = 1200;
+  const headRows = 120;
+  if (sourceRows.length <= maxRows) return { rows: sourceRows, disclosure: { truncated: false, totalRows: sourceRows.length, includedRows: sourceRows.length, omittedRows: 0, headRows: sourceRows.length, tailRows: 0 } };
+  const tailRows = Math.max(0, maxRows - headRows);
+  return {
+    rows: [...sourceRows.slice(0, headRows), ...sourceRows.slice(-tailRows)],
+    disclosure: {
+      truncated: true,
+      totalRows: sourceRows.length,
+      includedRows: maxRows,
+      omittedRows: Math.max(0, sourceRows.length - maxRows),
+      headRows,
+      tailRows,
+      policy: "report-bounded-head-tail; summary metrics are computed before truncation",
+      valuesRedacted: true
+    }
   };
 }
 
@@ -4408,6 +4438,27 @@ function finalizeLoadingSegment(segment, absentEvent) {
   };
 }
 
+function boundedTurnTimingRowsForReport(rows) {
+  const sourceRows = Array.isArray(rows) ? rows : [];
+  const maxRows = 1200;
+  const headRows = 120;
+  if (sourceRows.length <= maxRows) return { rows: sourceRows, disclosure: { truncated: false, totalRows: sourceRows.length, includedRows: sourceRows.length, omittedRows: 0, headRows: sourceRows.length, tailRows: 0 } };
+  const tailRows = Math.max(0, maxRows - headRows);
+  return {
+    rows: [...sourceRows.slice(0, headRows), ...sourceRows.slice(-tailRows)],
+    disclosure: {
+      truncated: true,
+      totalRows: sourceRows.length,
+      includedRows: maxRows,
+      omittedRows: Math.max(0, sourceRows.length - maxRows),
+      headRows,
+      tailRows,
+      policy: "report-bounded-head-tail; full anomaly counters are computed before truncation",
+      valuesRedacted: true
+    }
+  };
+}
+
 function buildTurnTimingTable(samples, timeline) {
   const columns = [];
   const registry = new Map();
@@ -6408,6 +6459,7 @@ function compactHeartbeat(value) {
 function renderTurnTimingTable(sampleMetrics) {
   const columns = Array.isArray(sampleMetrics?.turnColumns) ? sampleMetrics.turnColumns : [];
   const rows = Array.isArray(sampleMetrics?.turnTimingTable) ? sampleMetrics.turnTimingTable : [];
+  const disclosure = sampleMetrics?.turnTimingTableDisclosure || null;
   if (columns.length === 0 || rows.length === 0) return "- 无 turn 时间表。";
   const header = ["时间戳"];
   for (const column of columns) {
@@ -6461,7 +6513,10 @@ function renderTurnTimingTable(sampleMetrics) {
   const resetLines = recentUpdateResets.length > 0
     ? recentUpdateResets.slice(0, 80).map((item) => "- " + (item.columnLabel || item.columnId || "-") + " reset " + (item.fromValue ?? "-") + " -> " + (item.toValue ?? "-") + " delta=" + (item.delta ?? "-") + " sampleDelta=" + (item.sampleDeltaSeconds ?? "-") + " seq " + (item.fromSeq ?? "-") + " -> " + (item.toSeq ?? "-") + " ts " + (item.fromTs || "-") + " -> " + (item.toTs || "-") + " traceId=" + (item.traceId || "-")).join("\n")
     : "- 未观察到最近更新归零/回落。";
-  return lines.join("\n") + "\n\n列说明：\n" + columnLines + "\n\n异常事件（仅报表暴露，不做下游 repair；最近更新按三角波模型检测异常跳增）：\n" + nonMonotonicLines + "\n\nTerminal 后总耗时增长事件（终态 turn 的总耗时应 sealed，不应继续增长）：\n" + terminalGrowthLines + "\n\n总耗时归零跳变事件（例如已显示真实耗时后又变成 0 秒）：\n" + elapsedZeroResetLines + "\n\n总耗时异常前跳事件（预期按采样间隔近似递增；例如 14 秒 -> 1137 秒应被列入这里）：\n" + totalElapsedForwardJumpLines + "\n\n最近更新 sawtooth jump 事件（预期每秒增长约 1，遇到新活动归零；例如 1 秒 -> 1 分 4 秒应被列入这里）：\n" + sawtoothJumpLines + "\n\n最近更新相邻采样 step（按 delta 降序；用于人工识别一秒跳几十秒/一分钟的瞬态）：\n" + stepLines + "\n\n最近更新 reset 事件（预期三角波归零，不计为异常）：\n" + resetLines;
+  const disclosureLine = disclosure?.truncated
+    ? "表格披露：已按 head/tail 有界输出，totalRows=" + disclosure.totalRows + " includedRows=" + disclosure.includedRows + " omittedRows=" + disclosure.omittedRows + "；异常计数在截断前基于全量采样计算。"
+    : "表格披露：完整输出当前分析窗口的采样点。";
+  return disclosureLine + "\n\n" + lines.join("\n") + "\n\n列说明：\n" + columnLines + "\n\n异常事件（仅报表暴露，不做下游 repair；最近更新按三角波模型检测异常跳增）：\n" + nonMonotonicLines + "\n\nTerminal 后总耗时增长事件（终态 turn 的总耗时应 sealed，不应继续增长）：\n" + terminalGrowthLines + "\n\n总耗时归零跳变事件（例如已显示真实耗时后又变成 0 秒）：\n" + elapsedZeroResetLines + "\n\n总耗时异常前跳事件（预期按采样间隔近似递增；例如 14 秒 -> 1137 秒应被列入这里）：\n" + totalElapsedForwardJumpLines + "\n\n最近更新 sawtooth jump 事件（预期每秒增长约 1，遇到新活动归零；例如 1 秒 -> 1 分 4 秒应被列入这里）：\n" + sawtoothJumpLines + "\n\n最近更新相邻采样 step（按 delta 降序；用于人工识别一秒跳几十秒/一分钟的瞬态）：\n" + stepLines + "\n\n最近更新 reset 事件（预期三角波归零，不计为异常）：\n" + resetLines;
 }
 
 function formatMetricCell(value) {