From 8a367a76855175b73703cb7f6a3c4ef0aee0c16a Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Tue, 6 Oct 2026 02:59:15 +0000
Subject: [PATCH 1/2] ci(merge-queue): classify a no-runner red as
 infra:no-runner in the triage comment

Claude-Session: https://claude.ai/code/session_01VDtqoecgES7ScQYGbFVDRv
Co-authored-by: Claude <noreply@anthropic.com>
---
 .github/workflows/merge-queue-triage.yml      |  191 +-
 .../check-run-111979038621.annotations.json   |   34 +
 .../run-37371558473.jobs.json                 | 1023 +++++++++
 .../run-37374282440.jobs.json                 | 1954 +++++++++++++++++
 4 files changed, 3199 insertions(+), 3 deletions(-)
 create mode 100644 scripts/fixtures/merge-queue-triage/check-run-111979038621.annotations.json
 create mode 100644 scripts/fixtures/merge-queue-triage/run-37371558473.jobs.json
 create mode 100644 scripts/fixtures/merge-queue-triage/run-37374282440.jobs.json

diff --git a/.github/workflows/merge-queue-triage.yml b/.github/workflows/merge-queue-triage.yml
index 60d87161a49..547995e0323 100644
--- a/.github/workflows/merge-queue-triage.yml
+++ b/.github/workflows/merge-queue-triage.yml
@@ -101,6 +101,45 @@ name: Merge Queue Triage
 # `skip`/`only` written anywhere. Weakening a gate stays a human act, and an
 # anchor issue is a place for that conversation, not a verdict in it.
 #
+# ## A shard that never got a runner is not a test failure (limb ③)
+#
+# On 2026-10-05 one PR was ejected twice with nothing in it failing: queue
+# build 37371558473 had ten jobs cancelled before any of them was handed a
+# runner, and 37374282440 had one (`Test Core (5/6)`). In both, the only
+# `failure` was an AGGREGATE gate (`Test Core`, `Dogfood Regression Gate`)
+# refusing because a shard of its own family published no attestation. The
+# comment printed those aggregates as the failure and "日志不可读" beside them,
+# and a person had to open the jobs to tell a runner outage from a test red.
+#
+# So every run is now CLASSIFIED, from the job RECORD and never from log text:
+#
+#   infra:no-runner  a job ended `cancelled` with an empty `runner_name` and no
+#                    steps, OR its check run carries the "not acquired by
+#                    Runner" annotation (read only for a cancelled job the
+#                    record did not already decide).
+#
+# The BUILD is `infra:no-runner` only when that explains EVERY red: each other
+# red job is an aggregate whose failed steps are all `Verify … results` AND
+# whose own shard family (`<name> (k/n)`) has a no-runner member. Anything left
+# unexplained — a real failing step, a cancelled job that did get a runner, an
+# annotation that could not be read — makes it `failure`, read the way it
+# always was. That direction is the safe one: a mis-read outage costs a person
+# a look, a mis-read failure would be waved through as weather.
+#
+# ⛔ The attestation rule does not move (#6082): a shard that never ran still
+# does not count as passing, and nothing here changes whether a build is
+# green. This changes how a red is NAMED and what the comment advises.
+#
+# Re-queue budget: ONE per PR head sha. An `infra:no-runner` comment carries a
+# per-head marker; the next `infra:no-runner` red on the SAME head finds it and
+# says the budget is spent and a person has to look. A `failure` never earns
+# the advice. ⚠️ The ACT is not wired: this job holds no credential that can
+# enqueue a pull request (GitHub's auto-merge / enqueue mutations need
+# `contents: write`, and a merge group created by this run's own GITHUB_TOKEN
+# is not one CI is known to build), so the comment states the verdict and a
+# person or seat performs the one re-queue. The harness enforces that: an
+# enqueue call is an unmodelled API and fails the battery.
+#
 # Fires on conclusion == failure ONLY. 'cancelled' is the queue evicting an
 # entry because something AHEAD of it failed (or a manual cancel) — it says
 # nothing about this PR, so it gets no comment (the same run-lifecycle
@@ -110,7 +149,9 @@ name: Merge Queue Triage
 # workflow_run executes in the DEFAULT branch's context: this file must be on
 # main before it fires, it never checks out or runs PR code, and it holds the
 # minimum permissions (actions: read for logs, pull-requests: write for the
-# comment, issues: write for the anchor issue limb ② files and refreshes).
+# comment and the PR head limb ③ keys its budget on, issues: write for the
+# anchor issue limb ② files and refreshes, checks: read for the "not acquired
+# by Runner" annotation limb ③ consults).
 #
 # Delivery is retried, never assumed (#9424). A transient GitHub API failure used
 # to kill this job outright — github-script hands any throw from the script to
@@ -156,6 +197,7 @@ jobs:
       actions: read
       pull-requests: write
       issues: write
+      checks: read
     steps:
       - name: Post the triage comment
         uses: actions/github-script@v9
@@ -244,12 +286,17 @@ jobs:
             // redelivered workflow_run stops HERE, before any sighting is recorded
             // and before any anchor is touched, so one queue build contributes its
             // signature exactly once however many times GitHub delivers it.
+            //
+            // The listing is kept (`prComments`) because limb ③ reads its
+            // per-head re-queue markers out of the same comments; `null` means
+            // it could not be read, which limb ③ must not mistake for "none".
             let alreadyPosted = false;
+            let prComments = null;
             try {
-              const existing = await github.rest.issues.listComments({
+              prComments = await github.paginate(github.rest.issues.listComments, {
                 owner, repo, issue_number: prNumber, per_page: 100,
               });
-              alreadyPosted = existing.data.some((c) => (c.body ?? '').includes(marker));
+              alreadyPosted = prComments.some((c) => (c.body ?? '').includes(marker));
             } catch (error) {
               core.warning(
                 `Could not read #${prNumber}'s comments to check for an existing triage `
@@ -269,6 +316,93 @@ jobs:
             });
             const failedJobs = jobs.filter((j) => j.conclusion === 'failure');
 
+            // ── Limb ③: classify the red — infra:no-runner or failure ──────
+            //
+            // Keyed on the job RECORD (see the header), never on log text: a
+            // job that never got a runner has no log to read. The annotation
+            // is consulted only for a cancelled job the record did not
+            // already decide, so the common case costs no extra request.
+            const NO_RUNNER_ANNOTATION = /not acquired by Runner/i;
+            const AGGREGATE_STEP = /^Verify .* results$/;
+            const GREEN = new Set(['success', 'skipped', 'neutral']);
+            const redJobs = jobs.filter((j) => !GREEN.has(j.conclusion));
+            const noRunnerByRecord = (j) => j.conclusion === 'cancelled'
+              && String(j.runner_name ?? '') === ''
+              && (j.steps ?? []).length === 0;
+            const noRunner = [];
+            const annotationRefusals = [];
+            for (const j of redJobs.filter((x) => x.conclusion === 'cancelled')) {
+              if (noRunnerByRecord(j)) { noRunner.push({ job: j, via: 'record' }); continue; }
+              const checkRunId = Number(String(j.check_run_url ?? '').split('/').pop()) || j.id;
+              try {
+                const res = await github.rest.checks.listAnnotations({
+                  owner, repo, check_run_id: checkRunId, per_page: 100,
+                });
+                if ((res.data ?? []).some((a) => NO_RUNNER_ANNOTATION.test(String(a?.message ?? '')))) {
+                  noRunner.push({ job: j, via: 'annotation' });
+                }
+              } catch (error) {
+                annotationRefusals.push(`${j.name}（${describe(error)}）`);
+              }
+            }
+            const noRunnerNames = noRunner.map((x) => x.job.name);
+            // An aggregate red is EXPLAINED only by a no-runner member of its
+            // OWN shard family. A `Verify … results` failure with no such
+            // member is a shard that ran and did not attest — unexplained.
+            const explainedAggregate = (j) => {
+              const failedSteps = (j.steps ?? []).filter((s) => s.conclusion === 'failure');
+              return j.conclusion === 'failure'
+                && failedSteps.length > 0
+                && failedSteps.every((s) => AGGREGATE_STEP.test(s.name))
+                && noRunnerNames.some((n) => n.startsWith(`${j.name} (`));
+            };
+            const explainedAggregates = redJobs.filter(explainedAggregate);
+            const unexplained = redJobs.filter((j) =>
+              !noRunner.some((x) => x.job === j) && !explainedAggregates.includes(j));
+            const infraOnly = noRunner.length > 0 && unexplained.length === 0;
+            const buildClass = infraOnly ? 'infra:no-runner' : 'failure';
+            if (annotationRefusals.length > 0) {
+              core.warning(
+                `Could not read the check-run annotations of ${annotationRefusals.length} cancelled job(s), `
+                + 'so they were NOT classified as infra:no-runner and the build reads as `failure`.',
+                { title: 'infra:no-runner classification incomplete' },
+              );
+            }
+
+            // The re-queue budget: ONE per PR head sha. The head is read from
+            // the PR itself (the queue ref names the BASE the build stacked
+            // on, not the PR's head). Every way of not knowing — head
+            // unreadable, comments unreadable — is `unknown`, never `once`:
+            // a second automatic chance is the thing this must not invent.
+            const NO_RUNNER_MARK = /<!-- merge-queue-infra:no-runner\|pr=(\d+)\|head=([0-9a-f]{40})\|run=(\d+) -->/g;
+            let prHead = null;
+            let requeue = null;
+            if (infraOnly) {
+              let headRefusal = null;
+              try {
+                const pr = await github.rest.pulls.get({ owner, repo, pull_number: prNumber });
+                const sha = String(pr.data?.head?.sha ?? '');
+                if (/^[0-9a-f]{40}$/.test(sha)) prHead = sha;
+              } catch (error) {
+                headRefusal = describe(error);
+              }
+              if (!prHead) {
+                requeue = { verdict: 'unknown', why: `读不到 PR 当前的 head sha（${headRefusal ?? 'head.sha 缺失'}）` };
+              } else if (prComments === null) {
+                requeue = { verdict: 'unknown', why: '读不到本 PR 的评论，无法确认这个 head 是否已经用掉过一次 infra:no-runner 重排' };
+              } else {
+                const priorRuns = new Set();
+                for (const c of prComments) {
+                  for (const mm of String(c.body ?? '').matchAll(NO_RUNNER_MARK)) {
+                    if (Number(mm[1]) === prNumber && mm[2] === prHead && mm[3] !== String(run.id)) priorRuns.add(mm[3]);
+                  }
+                }
+                requeue = priorRuns.size === 0
+                  ? { verdict: 'once' }
+                  : { verdict: 'person', priorRuns: [...priorRuns] };
+              }
+            }
+
             // ── Log harvest ────────────────────────────────────────────────
             //
             // Best-effort: the lines a human would grep for first, plus the line
@@ -834,6 +968,54 @@ jobs:
               ? `⚠️ **本 PR 过去 24h 已在队列失败 ${priorFailuresThisPr} 次（不含本次）。** 内容未变而反复失败 ⇒ 高度怀疑 flaky 测试或与同组 PR 的语义冲突，重排不解决。`
               : '本 PR 过去 24h 无队列失败记录（首次）。';
 
+            // ── Limb ③ in the comment: the class, by name, and the verdict ──
+            const nameList = (list) => {
+              const shown = list.slice(0, 20).map((n) => `\`${n}\``).join('、');
+              return list.length > 20 ? `${shown} 等共 ${list.length} 个` : shown;
+            };
+            const classLines = [];
+            if (infraOnly) {
+              classLines.push(
+                '**分类：`infra:no-runner`** —— 这次的红**全部**来自没拿到 runner 的 job，**不是测试失败**。',
+                '判据读的是 job 记录，不是日志：`cancelled` + `runner_name` 为空 + 0 个步骤，或 check run 带 “not acquired by Runner” 注解。',
+                '',
+                `- 没拿到 runner 的 job（${noRunner.length} 个）：${nameList(noRunnerNames)}`,
+              );
+              if (explainedAggregates.length > 0) {
+                classLines.push(`- 聚合 job 的红只因为同族分片没跑：${nameList(explainedAggregates.map((j) => j.name))}（失败步骤只有 \`Verify … results\`）`);
+              }
+              classLines.push('- ⛔ 没跑的分片**仍然不算通过**（证明规则不变）：这里只改「这次红怎么归类」，不改「构建算不算绿」。');
+              if (requeue.verdict === 'once') {
+                classLines.push(
+                  `- **重排判定：可以重排一次。** 这是 head \`${prHead.slice(0, 12)}\` 第一次因 infra:no-runner 被弹出。`
+                    + '本 workflow 没有入队所需的凭据，**不会自动重排** —— 请人工重排**一次**。同一个 head 再次 infra:no-runner 红就交给人，不再重排。',
+                );
+              } else if (requeue.verdict === 'person') {
+                classLines.push(
+                  `- ⛔ **重排判定：交给人，不要再重排。** head \`${prHead.slice(0, 12)}\` 已经因 infra:no-runner 被弹出过`
+                    + `（队列构建 ${requeue.priorRuns.map((id) => `[${id}](https://github.com/${owner}/${repo}/actions/runs/${id})`).join('、')}），`
+                    + '每个 head 只给一次重排。连续没拿到 runner 需要人去看 runner 状态。',
+                );
+              } else {
+                classLines.push(`- ⚠️ **重排判定：无法确认**（${requeue.why}）⇒ 按「交给人」处理，不要据此重排。`);
+              }
+            } else {
+              classLines.push('**分类：`failure`** —— 按下面的日志分诊。');
+              if (noRunner.length > 0) {
+                classLines.push(
+                  '',
+                  `- 另有 ${noRunner.length} 个 job 没拿到 runner（${nameList(noRunnerNames)}），`
+                    + `但还有它们解释不了的红：${nameList(unexplained.map((j) => `${j.name} · ${j.conclusion}`))} ⇒ 不是纯 infra:no-runner，⛔ 不按 runner 故障重排。`,
+                );
+              }
+            }
+            if (annotationRefusals.length > 0) {
+              classLines.push(`- ⚠️ ${annotationRefusals.length} 个 cancelled job 的注解读不到，未能判定是否 no-runner，已按 failure 计：${annotationRefusals.join('、')}`);
+            }
+            const noRunnerMarker = infraOnly && prHead
+              ? `<!-- merge-queue-infra:no-runner|pr=${prNumber}|head=${prHead}|run=${run.id} -->`
+              : null;
+
             // The sighting markers this comment contributes to the 24 h ledger.
             const sightingMarkers = runKeys.map((k) => `<!-- queue-signature:${k}|pr=${prNumber}|run=${run.id} -->`);
 
@@ -843,6 +1025,8 @@ jobs:
               `队列构建 [${run.id}](${run.html_url}) 红了。队列跑的是**全量**套件（PR 侧 CI 只跑 affected 子集），`,
               '所以失败的测试可能在本 PR 没碰过的包里 —— 那不是重排能修的。每次盲目重排都会让排在后面的所有 PR 重建一轮。',
               '',
+              ...classLines,
+              '',
               '**失败的 job（日志抽取，best effort）：**',
               '',
               jobSections || '- （没拿到 job 级信息，点上面的 run 链接看）',
@@ -871,6 +1055,7 @@ jobs:
               '',
               marker,
               ...sightingMarkers,
+              ...(noRunnerMarker ? [noRunnerMarker] : []),
               '---',
               '_Generated by [Claude Code](https://claude.ai/code) · merge-queue-triage workflow (#4859)_',
             ].join('\n');
diff --git a/scripts/fixtures/merge-queue-triage/check-run-111979038621.annotations.json b/scripts/fixtures/merge-queue-triage/check-run-111979038621.annotations.json
new file mode 100644
index 00000000000..8de11890ec1
--- /dev/null
+++ b/scripts/fixtures/merge-queue-triage/check-run-111979038621.annotations.json
@@ -0,0 +1,34 @@
+[
+  {
+    "path": ".github",
+    "start_line": 1,
+    "end_line": 1,
+    "annotation_level": "failure",
+    "title": "",
+    "message": "The job was not acquired by Runner of type hosted even after multiple attempts"
+  },
+  {
+    "path": ".github",
+    "start_line": 1,
+    "end_line": 1,
+    "annotation_level": "notice",
+    "title": "",
+    "message": "\"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748\""
+  },
+  {
+    "path": ".github",
+    "start_line": 1,
+    "end_line": 1,
+    "annotation_level": "notice",
+    "title": "",
+    "message": "\"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748\""
+  },
+  {
+    "path": ".github",
+    "start_line": 1,
+    "end_line": 1,
+    "annotation_level": "notice",
+    "title": "",
+    "message": "\"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748\""
+  }
+]
diff --git a/scripts/fixtures/merge-queue-triage/run-37371558473.jobs.json b/scripts/fixtures/merge-queue-triage/run-37371558473.jobs.json
new file mode 100644
index 00000000000..31664d86761
--- /dev/null
+++ b/scripts/fixtures/merge-queue-triage/run-37371558473.jobs.json
@@ -0,0 +1,1023 @@
+{
+  "run_id": 37371558473,
+  "total_count": 17,
+  "jobs": [
+    {
+      "id": 111969698908,
+      "run_id": 37371558473,
+      "name": "filter",
+      "html_url": "https://github.com/objectstack-ai/objectstack/actions/runs/37371558473/job/111969698908",
+      "check_run_url": "https://api.github.com/repos/objectstack-ai/objectstack/check-runs/111969698908",
+      "status": "completed",
+      "conclusion": "success",
+      "runner_id": 1001213152,
+      "runner_name": "GitHub Actions 1001213152",
+      "steps": [
+        {
+          "name": "Set up job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 1
+        },
+        {
+          "name": "Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 2
+        },
+        {
+          "name": "Run dorny/paths-filter@v4",
+          "status": "completed",
+          "conclusion": "skipped",
+          "number": 3
+        },
+        {
+          "name": "Post Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 6
+        },
+        {
+          "name": "Complete job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 7
+        }
+      ]
+    },
+    {
+      "id": 111973256729,
+      "run_id": 37371558473,
+      "name": "Temporal Conformance (live PG + MySQL)",
+      "html_url": "https://github.com/objectstack-ai/objectstack/actions/runs/37371558473/job/111973256729",
+      "check_run_url": "https://api.github.com/repos/objectstack-ai/objectstack/check-runs/111973256729",
+      "status": "completed",
+      "conclusion": "success",
+      "runner_id": 1001213230,
+      "runner_name": "GitHub Actions 1001213230",
+      "steps": [
+        {
+          "name": "Set up job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 1
+        },
+        {
+          "name": "Initialize containers",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 2
+        },
+        {
+          "name": "Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 3
+        },
+        {
+          "name": "Point both servers at a non-UTC timezone",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 4
+        },
+        {
+          "name": "Setup Node.js",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 5
+        },
+        {
+          "name": "Setup pnpm",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 6
+        },
+        {
+          "name": "Get pnpm store directory",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 7
+        },
+        {
+          "name": "Setup pnpm cache",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 8
+        },
+        {
+          "name": "Restore Turbo cache",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 9
+        },
+        {
+          "name": "Install dependencies",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 10
+        },
+        {
+          "name": "Build driver-sql and its dependencies",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 11
+        },
+        {
+          "name": "Run driver-sql suite against both live servers",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 12
+        },
+        {
+          "name": "Build the non-SQL temporal backends",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 13
+        },
+        {
+          "name": "Run the non-SQL temporal backends under the skewed process zone",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 14
+        },
+        {
+          "name": "Build metadata-protocol and its dependencies",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 15
+        },
+        {
+          "name": "Run the metadata-protocol migration statements against live MySQL and PostgreSQL",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 16
+        },
+        {
+          "name": "Build runtime and its dependencies",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 17
+        },
+        {
+          "name": "Run the runtime cascade-delete matrix against live PostgreSQL",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 18
+        },
+        {
+          "name": "Post Setup pnpm cache",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 33
+        },
+        {
+          "name": "Post Setup Node.js",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 34
+        },
+        {
+          "name": "Post Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 35
+        },
+        {
+          "name": "Stop containers",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 36
+        },
+        {
+          "name": "Complete job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 37
+        }
+      ]
+    },
+    {
+      "id": 111973256742,
+      "run_id": 37371558473,
+      "name": "Build Core",
+      "html_url": "https://github.com/objectstack-ai/objectstack/actions/runs/37371558473/job/111973256742",
+      "check_run_url": "https://api.github.com/repos/objectstack-ai/objectstack/check-runs/111973256742",
+      "status": "completed",
+      "conclusion": "cancelled",
+      "runner_id": 0,
+      "runner_name": "",
+      "steps": []
+    },
+    {
+      "id": 111973256751,
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+        },
+        {
+          "name": "Verify dogfood shard results",
+          "status": "completed",
+          "conclusion": "failure",
+          "number": 4
+        },
+        {
+          "name": "Post Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 8
+        },
+        {
+          "name": "Complete job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 9
+        }
+      ]
+    }
+  ]
+}
diff --git a/scripts/fixtures/merge-queue-triage/run-37374282440.jobs.json b/scripts/fixtures/merge-queue-triage/run-37374282440.jobs.json
new file mode 100644
index 00000000000..5799532329c
--- /dev/null
+++ b/scripts/fixtures/merge-queue-triage/run-37374282440.jobs.json
@@ -0,0 +1,1954 @@
+{
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+          "name": "Post Setup Node.js",
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+        {
+          "name": "Post Setup pnpm cache",
+          "status": "completed",
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+          "number": 18
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+        {
+          "name": "Post Setup Node.js",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 19
+        },
+        {
+          "name": "Post Checkout repository",
+          "status": "completed",
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+          "number": 20
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+          "name": "Setup pnpm cache",
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+          "name": "Restore Turbo cache",
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+          "number": 7
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+          "name": "Save Turbo cache (main only)",
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+          "conclusion": "skipped",
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+        },
+        {
+          "name": "Attest this shard ran and passed",
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+          "conclusion": "success",
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+        },
+        {
+          "name": "Publish this shard's attestation",
+          "status": "completed",
+          "conclusion": "success",
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+        {
+          "name": "Post Setup pnpm cache",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 28
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+          "name": "Post Setup Node.js",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 29
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+          "name": "Post Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 30
+        },
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+          "name": "Complete job",
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+          "number": 5
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+          "name": "Setup pnpm cache",
+          "status": "completed",
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+        },
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+          "name": "Restore Turbo cache",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 7
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+        {
+          "name": "Install dependencies",
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+        {
+          "name": "Verify example apps via the `objectstack verify` CLI",
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+          "name": "Publish this leg's attestation",
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+        {
+          "name": "Post Setup pnpm cache",
+          "status": "completed",
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+          "name": "Post Setup Node.js",
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+          "status": "completed",
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+          "status": "completed",
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+          "number": 5
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+          "name": "Setup pnpm cache",
+          "status": "completed",
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+          "name": "Restore Turbo cache",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 7
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+          "name": "Install dependencies",
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+          "number": 8
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+          "name": "Compute this shard's package set",
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+          "status": "completed",
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+        {
+          "name": "Capture this shard's test timings",
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+          "name": "Publish this shard's test timings",
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+          "name": "Upload stall diagnostic reports",
+          "status": "completed",
+          "conclusion": "skipped",
+          "number": 16
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+        {
+          "name": "Save Turbo cache (main only)",
+          "status": "completed",
+          "conclusion": "skipped",
+          "number": 17
+        },
+        {
+          "name": "Attest this shard ran and passed",
+          "status": "completed",
+          "conclusion": "success",
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+        },
+        {
+          "name": "Publish this shard's attestation",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 19
+        },
+        {
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+        },
+        {
+          "name": "Post Setup Node.js",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 37
+        },
+        {
+          "name": "Post Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 38
+        },
+        {
+          "name": "Complete job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 39
+        }
+      ]
+    },
+    {
+      "id": 111979038748,
+      "run_id": 37374282440,
+      "name": "Test Core (4/6)",
+      "html_url": "https://github.com/objectstack-ai/objectstack/actions/runs/37374282440/job/111979038748",
+      "check_run_url": "https://api.github.com/repos/objectstack-ai/objectstack/check-runs/111979038748",
+      "status": "completed",
+      "conclusion": "success",
+      "runner_id": 1001213373,
+      "runner_name": "GitHub Actions 1001213373",
+      "steps": [
+        {
+          "name": "Set up job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 1
+        },
+        {
+          "name": "Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 2
+        },
+        {
+          "name": "Setup Node.js",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 3
+        },
+        {
+          "name": "Setup pnpm",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 4
+        },
+        {
+          "name": "Get pnpm store directory",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 5
+        },
+        {
+          "name": "Setup pnpm cache",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 6
+        },
+        {
+          "name": "Restore Turbo cache",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 7
+        },
+        {
+          "name": "Install dependencies",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 8
+        },
+        {
+          "name": "Compute this shard's package set",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 9
+        },
+        {
+          "name": "Build the sliced package's dependency closure",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 10
+        },
+        {
+          "name": "Run this shard's tests",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 11
+        },
+        {
+          "name": "Publish this shard's turbo run summary",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 12
+        },
+        {
+          "name": "Test completeness guard",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 13
+        },
+        {
+          "name": "Capture this shard's test timings",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 14
+        },
+        {
+          "name": "Publish this shard's test timings",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 15
+        },
+        {
+          "name": "Upload stall diagnostic reports",
+          "status": "completed",
+          "conclusion": "skipped",
+          "number": 16
+        },
+        {
+          "name": "Save Turbo cache (main only)",
+          "status": "completed",
+          "conclusion": "skipped",
+          "number": 17
+        },
+        {
+          "name": "Attest this shard ran and passed",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 18
+        },
+        {
+          "name": "Publish this shard's attestation",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 19
+        },
+        {
+          "name": "Post Setup pnpm cache",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 36
+        },
+        {
+          "name": "Post Setup Node.js",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 37
+        },
+        {
+          "name": "Post Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 38
+        },
+        {
+          "name": "Complete job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 39
+        }
+      ]
+    },
+    {
+      "id": 111985016801,
+      "run_id": 37374282440,
+      "name": "Dogfood Regression Gate",
+      "html_url": "https://github.com/objectstack-ai/objectstack/actions/runs/37374282440/job/111985016801",
+      "check_run_url": "https://api.github.com/repos/objectstack-ai/objectstack/check-runs/111985016801",
+      "status": "completed",
+      "conclusion": "success",
+      "runner_id": 1001213437,
+      "runner_name": "GitHub Actions 1001213437",
+      "steps": [
+        {
+          "name": "Set up job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 1
+        },
+        {
+          "name": "Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 2
+        },
+        {
+          "name": "Download dogfood attestations",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 3
+        },
+        {
+          "name": "Verify dogfood shard results",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 4
+        },
+        {
+          "name": "Post Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 8
+        },
+        {
+          "name": "Complete job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 9
+        }
+      ]
+    },
+    {
+      "id": 111995193336,
+      "run_id": 37374282440,
+      "name": "Test Core",
+      "html_url": "https://github.com/objectstack-ai/objectstack/actions/runs/37374282440/job/111995193336",
+      "check_run_url": "https://api.github.com/repos/objectstack-ai/objectstack/check-runs/111995193336",
+      "status": "completed",
+      "conclusion": "failure",
+      "runner_id": 1001213546,
+      "runner_name": "GitHub Actions 1001213546",
+      "steps": [
+        {
+          "name": "Set up job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 1
+        },
+        {
+          "name": "Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 2
+        },
+        {
+          "name": "Download test shard attestations",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 3
+        },
+        {
+          "name": "Verify test shard results",
+          "status": "completed",
+          "conclusion": "failure",
+          "number": 4
+        },
+        {
+          "name": "Download this run's shard test timings",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 5
+        },
+        {
+          "name": "Publish the test timing table",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 6
+        },
+        {
+          "name": "Publish the merged timing table artifact",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 7
+        },
+        {
+          "name": "Post Checkout repository",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 14
+        },
+        {
+          "name": "Complete job",
+          "status": "completed",
+          "conclusion": "success",
+          "number": 15
+        }
+      ]
+    }
+  ]
+}

From 499d0ae32e2259ee14eb10406e24c67013788548 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Tue, 6 Oct 2026 03:01:28 +0000
Subject: [PATCH 2/2] ci(merge-queue): pin infra:no-runner classification and
 the per-head re-queue budget

Claude-Session: https://claude.ai/code/session_01VDtqoecgES7ScQYGbFVDRv
Co-authored-by: Claude <noreply@anthropic.com>
---
 .github/workflows/merge-queue-triage.yml      |   2 +-
 scripts/check-merge-queue-triage-outcome.mjs  | 357 +++++++++++++++++-
 scripts/fixtures/merge-queue-triage/README.md |   8 +
 3 files changed, 362 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/merge-queue-triage.yml b/.github/workflows/merge-queue-triage.yml
index 547995e0323..e85b6455812 100644
--- a/.github/workflows/merge-queue-triage.yml
+++ b/.github/workflows/merge-queue-triage.yml
@@ -104,7 +104,7 @@ name: Merge Queue Triage
 # ## A shard that never got a runner is not a test failure (limb ③)
 #
 # On 2026-10-05 one PR was ejected twice with nothing in it failing: queue
-# build 37371558473 had ten jobs cancelled before any of them was handed a
+# build 37371558473 had eight jobs cancelled before any of them was handed a
 # runner, and 37374282440 had one (`Test Core (5/6)`). In both, the only
 # `failure` was an AGGREGATE gate (`Test Core`, `Dogfood Regression Gate`)
 # refusing because a shard of its own family published no attestation. The
diff --git a/scripts/check-merge-queue-triage-outcome.mjs b/scripts/check-merge-queue-triage-outcome.mjs
index 2449f5f97a8..c1f664deb15 100644
--- a/scripts/check-merge-queue-triage-outcome.mjs
+++ b/scripts/check-merge-queue-triage-outcome.mjs
@@ -31,6 +31,16 @@
 //     ones, and the `listForRepo` double honours `state` and `labels` so they
 //     can tell the two lookups apart at all.
 //
+//   limb (3) names the CLASS of a red -- `infra:no-runner` when every red is
+//     explained by jobs that never got a runner (read from the job RECORD and
+//     the check-run annotation, never from log text), `failure` otherwise --
+//     and states a re-queue budget of ONE per PR head, carried by a per-head
+//     marker that the NEXT red on that head must find. Like limb (2), the
+//     property lives in the pair of runs (N3 drives it as one), and the real
+//     2026-10-05 job records are the input (N1, N2). The act itself is not
+//     wired -- the workflow holds no credential that can enqueue -- so an
+//     enqueue call is unmodelled here on purpose (M28).
+//
 // So the subject here is the shipped bytes, driven twice where it matters, with
 // real logs on the input side and a full call ledger on the output side.
 //
@@ -52,8 +62,9 @@
 //
 // ## The corpus, and where every byte of it came from
 //
-// `scripts/fixtures/merge-queue-triage/` holds three files. None is invented,
-// and each states which half of the argument it carries:
+// `scripts/fixtures/merge-queue-triage/` holds three log files, plus the three
+// limb (3) job-record captures its README describes. None is invented, and
+// each states which half of the argument it carries:
 //
 //   plugin-dev-timeout.job-log.txt / plugin-dev-assertion.job-log.txt
 //     Real vitest 4.1.10 output, captured in this repo on 2026-08-20 by running
@@ -241,6 +252,14 @@ function fixture(root, name) {
   return readFileSync(path, 'utf8').split('\\u001b').join(ESC);
 }
 
+/**
+ * A trimmed REAL job-record capture -- `listJobsForWorkflowRun` for one queue
+ * build, cut down to the fields the shipped script reads (README: provenance).
+ */
+function jobsFixture(root, runId) {
+  return JSON.parse(fixture(root, `run-${runId}.jobs.json`)).jobs;
+}
+
 /**
  * Wrap captured tool output in the runner's line prefix.
  *
@@ -265,6 +284,11 @@ const MODELLED_ISSUE_METHODS = new Set([
   'addLabels',
 ]);
 const MODELLED_ACTION_METHODS = new Set(['listJobsForWorkflowRun', 'listWorkflowRunsForRepo']);
+// Limb (3) reads -- and ONLY reads -- these two. ⛔ An enqueue / auto-merge
+// mutation is deliberately NOT modelled: the workflow holds no credential that
+// can perform one, so a call to it fails the battery as an unmodelled access.
+const MODELLED_PULL_METHODS = new Set(['get']);
+const MODELLED_CHECK_METHODS = new Set(['listAnnotations']);
 
 /**
  * `github` / `context` / `core` doubles plus a full call ledger.
@@ -307,12 +331,19 @@ function makeDoubles(world) {
     addLabelsError: null,
     queueRuns: [],
     prCommentPostError: null,
+    // Limb (3): the PR's current head (what the re-queue budget is keyed on)
+    // and the check-run annotations, keyed by check-run id.
+    prHeadSha: 'c'.repeat(40),
+    prGetError: null,
+    annotations: {},
+    annotationErrors: {},
     ...world,
   };
 
   const calls = {
     listComments: [], listCommentsForRepo: [], listForRepo: [],
     createComment: [], issueCreate: [], issueUpdate: [], addLabels: [], logs: [],
+    pullsGet: [], listAnnotations: [],
   };
   const log = { info: [], warning: [], failed: [], summary: [] };
   const unstubbedCalls = [];
@@ -377,6 +408,23 @@ function makeDoubles(world) {
     },
   };
 
+  const pullsApi = {
+    async get({ pull_number: n }) {
+      calls.pullsGet.push(n);
+      if (w.prGetError) throw w.prGetError;
+      return { data: { number: n, head: { sha: w.prHeadSha } } };
+    },
+  };
+
+  const checksApi = {
+    async listAnnotations({ check_run_id: id }) {
+      calls.listAnnotations.push(id);
+      const err = w.annotationErrors[id];
+      if (err) throw err;
+      return { data: w.annotations[id] ?? [] };
+    },
+  };
+
   const actionsApi = {
     async listJobsForWorkflowRun() { return { data: w.jobs }; },
     async listWorkflowRunsForRepo() { return { data: w.queueRuns }; },
@@ -406,9 +454,11 @@ function makeDoubles(world) {
     {
       issues: guard(issuesApi, 'github.rest.issues', MODELLED_ISSUE_METHODS),
       actions: guard(actionsApi, 'github.rest.actions', MODELLED_ACTION_METHODS),
+      pulls: guard(pullsApi, 'github.rest.pulls', MODELLED_PULL_METHODS),
+      checks: guard(checksApi, 'github.rest.checks', MODELLED_CHECK_METHODS),
     },
     'github.rest',
-    new Set(['issues', 'actions']),
+    new Set(['issues', 'actions', 'pulls', 'checks']),
   );
 
   const github = guard(
@@ -608,6 +658,15 @@ const guidanceProse = (r) => postedBody(r);
 
 const REFUSED = httpError(503, 'No server is currently available to service your request.');
 
+// Limb (3)'s readings, single-sourced so a scenario and a mutation cannot
+// disagree about the spelling they look for.
+const PR_HEAD = 'd'.repeat(40);
+const INFRA_CLASS = '**分类：`infra:no-runner`**';
+const FAILURE_CLASS = '**分类：`failure`**';
+const VERDICT_ONCE = '重排判定：可以重排一次。';
+const VERDICT_PERSON = '重排判定：交给人，不要再重排。';
+const VERDICT_UNKNOWN = '重排判定：无法确认';
+
 function scenarios(root) {
   const TIMEOUT_LOG = asJobLog(fixture(root, 'plugin-dev-timeout.job-log.txt'));
   const ASSERTION_LOG = asJobLog(fixture(root, 'plugin-dev-assertion.job-log.txt'));
@@ -638,6 +697,21 @@ function scenarios(root) {
     ...over,
   });
 
+  // Limb (3)'s world: the REAL queue build that ejected #21872 on 2026-10-05
+  // with nothing failing -- its run id, its queue ref and its job records.
+  // Only the PR head is synthetic (PR_HEAD, declared below): the budget is
+  // keyed on it, and any fixed 40-hex value exercises the same comparison.
+  const noRunnerWorld = (over = {}) => ({
+    runId: 37374282440,
+    prNumber: 21872,
+    headBranch: 'gh-readonly-queue/main/pr-21872-cab639671528ef6f3a201e8995794378a4a28bfe',
+    headSha: '33486923c015218b3e203c948122c6aaa7bd1667',
+    prHeadSha: PR_HEAD,
+    jobs: jobsFixture(root, 37374282440),
+    logs: {},
+    ...over,
+  });
+
   return [
     // ── limb (1): the reason line ──────────────────────────────────────────
     {
@@ -1157,6 +1231,187 @@ function scenarios(root) {
         ];
       },
     },
+    // ── limb (3): infra:no-runner classification and the re-queue budget ──
+    {
+      id: 'N1',
+      name: 'REAL record (run 37374282440): one shard never got a runner -> `infra:no-runner`, re-queue ONCE',
+      world: () => noRunnerWorld(),
+      check(r, t) {
+        const body = postedBody(r);
+        return [
+          t(body.includes(INFRA_CLASS), `the comment NAMES the class, got: ${JSON.stringify(body.slice(0, 600))}`),
+          t(body.includes('`Test Core (5/6)`'), 'the shard that never got a runner is named'),
+          t(/聚合 job 的红只因为同族分片没跑：`Test Core`/.test(body), 'the aggregate red is attributed to its own family\'s missing shard'),
+          t(body.includes(VERDICT_ONCE), 'the verdict is: re-queue ONCE'),
+          t(body.includes('仍然不算通过'), 'the comment restates that a shard that never ran still does not attest as passing'),
+          t(body.includes(`<!-- merge-queue-infra:no-runner|pr=21872|head=${PR_HEAD}|run=37374282440 -->`),
+            'the durable per-head marker is written, keyed on the PR HEAD (not the queue sha)'),
+          t(r.calls.pullsGet.length === 1, `the PR head is read once, got ${r.calls.pullsGet.length}`),
+          t(r.calls.listAnnotations.length === 0, 'the record decided every cancelled job, so no annotation is fetched'),
+          t(r.log.failed.length === 0 && r.calls.createComment.length === 1, 'and the comment is delivered'),
+        ];
+      },
+    },
+    {
+      id: 'N2',
+      name: 'REAL record (run 37371558473): eight jobs without a runner, two aggregates red -> `infra:no-runner`',
+      world: () => noRunnerWorld({ runId: 37371558473, jobs: jobsFixture(root, 37371558473) }),
+      check(r, t) {
+        const body = postedBody(r);
+        return [
+          t(body.includes(INFRA_CLASS), 'the class is named'),
+          t(body.includes('没拿到 runner 的 job（8 个）'), `all eight no-runner jobs are counted, got: ${JSON.stringify(body.slice(0, 900))}`),
+          t(body.includes('`Build Core`'), 'a no-runner job outside any shard family (`Build Core`) is named too'),
+          t(body.includes('`Test Core`') && body.includes('`Dogfood Regression Gate`'), 'both aggregates are explained by their own families'),
+          t(body.includes(VERDICT_ONCE), 'first no-runner red on this head -> once'),
+        ];
+      },
+    },
+    {
+      id: 'N3',
+      name: 'the SECOND no-runner red on the SAME head goes to a person, and is not re-queued',
+      // Driven as a pair, like A2: run 2 reads run 1's OWN comment, so the
+      // marker's spelling cannot drift between writer and reader unnoticed.
+      world: () => noRunnerWorld(),
+      rerun: (first) => noRunnerWorld({ runId: 37374999999, prComments: [postedBody(first)] }),
+      check(r, t, first) {
+        const body = postedBody(r);
+        return [
+          t(postedBody(first).includes(VERDICT_ONCE), 'the first run granted the one re-queue'),
+          t(body.includes(INFRA_CLASS), 'the second run still names the class'),
+          t(body.includes(VERDICT_PERSON), `the second run sends it to a person, got: ${JSON.stringify(body.slice(0, 900))}`),
+          t(!body.includes(VERDICT_ONCE), 'and does NOT grant a second re-queue'),
+          t(body.includes('37374282440'), 'it names the earlier queue build that spent the budget'),
+        ];
+      },
+    },
+    {
+      id: 'N4',
+      name: 'the budget is PER HEAD: a no-runner marker for an OLDER head does not spend the new head\'s re-queue',
+      world: () => noRunnerWorld({
+        prComments: [`earlier\n<!-- merge-queue-infra:no-runner|pr=21872|head=${'e'.repeat(40)}|run=37000000000 -->`],
+      }),
+      check(r, t) {
+        return [
+          t(postedBody(r).includes(VERDICT_ONCE), 'a new head gets its own one re-queue'),
+          t(!postedBody(r).includes(VERDICT_PERSON), 'and is not sent to a person on an old head\'s account'),
+        ];
+      },
+    },
+    {
+      id: 'N5',
+      name: 'a REAL shard failure is `failure`, earns no re-queue, and writes no no-runner marker',
+      world: () => base(),
+      check(r, t) {
+        const body = postedBody(r);
+        return [
+          t(body.includes(FAILURE_CLASS), `the class is named as failure, got: ${JSON.stringify(body.slice(0, 600))}`),
+          t(!body.includes(INFRA_CLASS) && !body.includes('重排判定'), 'no infra class and no re-queue verdict'),
+          t(!body.includes('merge-queue-infra:no-runner|'), 'no per-head marker is written -- a real failure spends no budget'),
+          t(r.calls.pullsGet.length === 0, 'the PR head is not even read'),
+        ];
+      },
+    },
+    {
+      id: 'N6',
+      name: 'MIXED: a no-runner shard beside a REAL failing shard is `failure`, never re-queued',
+      world: () => noRunnerWorld({
+        jobs: [
+          ...jobsFixture(root, 37374282440).filter((j) => j.name !== 'Test Core (2/6)'),
+          shardJob(111, 'Test Core (2/6)'),
+        ],
+        logs: { 111: TIMEOUT_LOG },
+      }),
+      check(r, t) {
+        const body = postedBody(r);
+        return [
+          t(body.includes(FAILURE_CLASS), `the class is failure, got: ${JSON.stringify(body.slice(0, 900))}`),
+          t(!body.includes('重排判定'), 'no re-queue verdict at all'),
+          t(body.includes('另有 1 个 job 没拿到 runner') && body.includes('Test Core (2/6) · failure'),
+            'the no-runner job is still reported, and the red it cannot explain is named'),
+          t(!body.includes('merge-queue-infra:no-runner|'), 'no per-head marker'),
+        ];
+      },
+    },
+    {
+      id: 'N7',
+      name: 'ANNOTATION leg: a cancelled job that DID get a runner is no-runner only if its check run says so',
+      world: () => noRunnerWorld({
+        jobs: jobsFixture(root, 37374282440).map((j) => (j.name === 'Test Core (5/6)'
+          ? { ...j, runner_name: 'GitHub Actions 1001213999', runner_id: 1001213999 }
+          : j)),
+        annotations: { 111979038621: JSON.parse(fixture(root, 'check-run-111979038621.annotations.json')) },
+      }),
+      rerun: () => noRunnerWorld({
+        // The control: same record, NO such annotation -- a job-level timeout
+        // or a manual cancel looks exactly like this, and is not weather.
+        jobs: jobsFixture(root, 37374282440).map((j) => (j.name === 'Test Core (5/6)'
+          ? { ...j, runner_name: 'GitHub Actions 1001213999', runner_id: 1001213999 }
+          : j)),
+      }),
+      check(r, t, first) {
+        return [
+          t(first.calls.listAnnotations.includes(111979038621), 'the annotation is read for the undecided cancelled job'),
+          t(postedBody(first).includes(INFRA_CLASS) && postedBody(first).includes(VERDICT_ONCE),
+            'the real "not acquired by Runner" annotation classifies it'),
+          t(postedBody(r).includes(FAILURE_CLASS) && !postedBody(r).includes('重排判定'),
+            'without the annotation the same record is `failure`, with no re-queue'),
+        ];
+      },
+    },
+    {
+      id: 'N8',
+      name: 'NOT KNOWING is never `once`: an unreadable PR head or comment list leaves the verdict unknown',
+      world: () => noRunnerWorld({ prGetError: REFUSED }),
+      rerun: () => noRunnerWorld({ prCommentsError: REFUSED }),
+      check(r, t, first) {
+        return [
+          t(postedBody(first).includes(INFRA_CLASS) && postedBody(first).includes(VERDICT_UNKNOWN)
+            && !postedBody(first).includes(VERDICT_ONCE), 'head unreadable -> unknown, not once'),
+          t(!postedBody(first).includes('merge-queue-infra:no-runner|'), 'and no marker keyed on a head it never read'),
+          t(postedBody(r).includes(VERDICT_UNKNOWN) && !postedBody(r).includes(VERDICT_ONCE),
+            `comments unreadable -> unknown, not once, got: ${JSON.stringify(postedBody(r).slice(0, 900))}`),
+          t(postedBody(r).includes(`head=${PR_HEAD}|run=`), 'the sighting is still recorded when the head IS known'),
+        ];
+      },
+    },
+    {
+      id: 'N9',
+      name: 'an aggregate red is explained only by its OWN family: a no-runner `Test Core` shard does not excuse a red `Dogfood Regression Gate`',
+      world: () => noRunnerWorld({
+        jobs: [
+          ...jobsFixture(root, 37374282440),
+          {
+            id: 222, name: 'Dogfood Regression Gate', conclusion: 'failure', runner_name: 'GitHub Actions 1',
+            html_url: 'https://github.com/objectstack-ai/objectstack/actions/runs/1/job/222',
+            steps: [{ name: 'Verify dogfood shard results', conclusion: 'failure' }],
+          },
+        ],
+      }),
+      check(r, t) {
+        return [
+          t(postedBody(r).includes(FAILURE_CLASS), `the unexplained aggregate keeps it failure, got: ${JSON.stringify(postedBody(r).slice(0, 900))}`),
+          t(!postedBody(r).includes('重排判定'), 'no re-queue verdict'),
+        ];
+      },
+    },
+    {
+      id: 'N10',
+      name: 'an unreadable annotation is never read as no-runner, and says so',
+      world: () => noRunnerWorld({
+        jobs: jobsFixture(root, 37374282440).map((j) => (j.name === 'Test Core (5/6)'
+          ? { ...j, runner_name: 'GitHub Actions 1001213999' }
+          : j)),
+        annotationErrors: { 111979038621: httpError(403, 'Resource not accessible by integration') },
+      }),
+      check(r, t) {
+        return [
+          t(postedBody(r).includes(FAILURE_CLASS), 'the build reads as failure'),
+          t(postedBody(r).includes('注解读不到'), 'the comment says the annotation could not be read'),
+          t(r.log.warning.some((x) => /classification incomplete/i.test(x.props?.title ?? '')), 'and the run is annotated'),
+        ];
+      },
+    },
   ];
 }
 
@@ -1186,6 +1441,14 @@ export async function judge(source, root) {
   if (perms['pull-requests'] !== 'write') {
     failures.push({ id: 'P0', message: `job \`${JOB}\` must keep \`pull-requests: write\` -- the comment is the primary signal. Got: ${JSON.stringify(perms)}` });
   }
+  checked++;
+  if (perms.checks !== 'read') {
+    failures.push({ id: 'P0', message: `job \`${JOB}\` must declare \`checks: read\` (and no more) -- limb (3) reads the "not acquired by Runner" annotation. Got: ${JSON.stringify(perms)}` });
+  }
+  checked++;
+  if (perms.contents !== undefined) {
+    failures.push({ id: 'P0', message: `job \`${JOB}\` must not hold \`contents:\` -- nothing here enqueues, merges or writes a ref; a re-queue credential is a decision to take in the open, not a grant to slip in. Got: ${JSON.stringify(perms)}` });
+  }
 
   for (const s of scenarios(root)) {
     const t = (cond, message) => { checked++; return cond ? null : { id: s.id, message }; };
@@ -1491,6 +1754,79 @@ const MUTATIONS = [
     expect: ['E1'],
     keepGreen: ['A1'],
   },
+  // ── limb (3) ──────────────────────────────────────────────────────────
+  {
+    id: 'M20',
+    what: 'the job-RECORD leg is dropped, so a cancelled job with no runner and no steps is no longer infra:no-runner',
+    from: "  if (noRunnerByRecord(j)) { noRunner.push({ job: j, via: 'record' }); continue; }",
+    to: '',
+    expect: ['N1', 'N2'],
+    keepGreen: ['N5'],
+  },
+  {
+    id: 'M21',
+    what: 'an aggregate red is excused by ANY no-runner job, not one of its own shard family',
+    from: '    && noRunnerNames.some((n) => n.startsWith(`${j.name} (`));',
+    to: '    && noRunner.length > 0;',
+    expect: ['N9'],
+    keepGreen: ['N1', 'N2'],
+  },
+  {
+    id: 'M22',
+    what: 'a no-runner job anywhere makes the build infra:no-runner, so a REAL failure beside it earns a re-queue',
+    from: 'const infraOnly = noRunner.length > 0 && unexplained.length === 0;',
+    to: 'const infraOnly = noRunner.length > 0;',
+    expect: ['N6', 'N9'],
+    keepGreen: ['N5', 'N1'],
+  },
+  {
+    id: 'M23',
+    what: 'the budget stops being keyed on the head, so ANY earlier no-runner marker on the PR spends it',
+    from: 'mm[2] === prHead && ',
+    to: '',
+    expect: ['N4'],
+    keepGreen: ['N3'],
+  },
+  {
+    id: 'M24',
+    what: 'an earlier no-runner red on the same head is not counted, so the same head is re-queued again and again',
+    from: 'priorRuns.add(mm[3]);',
+    to: 'void mm;',
+    expect: ['N3'],
+    keepGreen: ['N4'],
+  },
+  {
+    id: 'M25',
+    what: 'an unreadable comment listing stops being `unknown` (the script then reads the absent listing as if it were there)',
+    from: '  } else if (prComments === null) {',
+    to: '  } else if (false) {',
+    expect: ['N8'],
+    keepGreen: ['N1'],
+  },
+  {
+    id: 'M26',
+    what: 'the "not acquired by Runner" annotation is no longer consulted',
+    from: "NO_RUNNER_ANNOTATION.test(String(a?.message ?? ''))",
+    to: 'false',
+    expect: ['N7'],
+    keepGreen: ['N1'],
+  },
+  {
+    id: 'M27',
+    what: 'the per-head marker is no longer written, so a second no-runner red on the head cannot be recognised',
+    from: '  ...(noRunnerMarker ? [noRunnerMarker] : []),',
+    to: '',
+    expect: ['N1', 'N3'],
+    keepGreen: ['N5'],
+  },
+  {
+    id: 'M28',
+    what: 'the script grows an enqueue call -- an act this workflow holds no credential for, so it must fail the battery as unmodelled',
+    from: 'const noRunnerMarker = infraOnly && prHead',
+    to: "if (infraOnly) await github.graphql('mutation { enqueuePullRequest }');\nconst noRunnerMarker = infraOnly && prHead",
+    expect: ['N1'],
+    keepGreen: ['N5'],
+  },
 ];
 
 // Returned by `selfTest()` only after its verdict is printed. The dispatch
@@ -1571,7 +1907,10 @@ async function selfTest() {
   // 5. The corpus is the evidence. A fixture that quietly vanished would leave
   //    every extraction scenario asserting over an empty string.
   battery('5. The corpus is the evidence. A fixture that quietly vanished would leave');
-  for (const name of ['plugin-dev-timeout.job-log.txt', 'plugin-dev-assertion.job-log.txt', 'incident-32333709633-published-excerpt.job-log.txt']) {
+  for (const name of [
+    'plugin-dev-timeout.job-log.txt', 'plugin-dev-assertion.job-log.txt', 'incident-32333709633-published-excerpt.job-log.txt',
+    'run-37374282440.jobs.json', 'run-37371558473.jobs.json', 'check-run-111979038621.annotations.json',
+  ]) {
     assert(existsSync(join(root, FIXTURES, name)), `corpus: ${FIXTURES}/${name} exists`);
   }
   const timeoutFixture = fixture(root, 'plugin-dev-timeout.job-log.txt');
@@ -1582,6 +1921,16 @@ async function selfTest() {
   const failOf = (t) => t.split('\n').find((l) => / FAIL  src\//.test(l));
   assert(failOf(timeoutFixture) === failOf(assertionFixture),
     'corpus: the two captures share a byte-identical FAIL line -- that identity IS the defect limb (1) exists for');
+  // Limb (3)'s corpus must keep carrying the shape it is evidence of: a job
+  // that ended `cancelled` with no runner and no steps, and the platform's own
+  // annotation for it. A recapture that lost either would leave N1/N2/N7
+  // asserting over a world that no longer exhibits the outage.
+  const shard56 = jobsFixture(root, 37374282440).find((j) => j.name === 'Test Core (5/6)');
+  assert(shard56?.conclusion === 'cancelled' && shard56?.runner_name === '' && shard56?.steps?.length === 0,
+    'corpus: run 37374282440 still records `Test Core (5/6)` as cancelled with no runner and no steps');
+  assert(JSON.parse(fixture(root, 'check-run-111979038621.annotations.json'))
+    .some((a) => /not acquired by Runner/.test(a.message)),
+  'corpus: the captured annotation still carries the platform\'s "not acquired by Runner" message');
 
   // 6. Wiring. A check nobody runs is the #4449 shape this repo keeps paying for.
   battery('6. Wiring. A check nobody runs is the #4449 shape this repo keeps paying for.');
diff --git a/scripts/fixtures/merge-queue-triage/README.md b/scripts/fixtures/merge-queue-triage/README.md
index a9280acab3c..f9ca56dd9a3 100644
--- a/scripts/fixtures/merge-queue-triage/README.md
+++ b/scripts/fixtures/merge-queue-triage/README.md
@@ -13,6 +13,9 @@ extractor.
 | `plugin-dev-timeout.job-log.txt` | Real vitest 4.1.10 output, captured 2026-08-20 in this repo. `packages/plugins/plugin-dev/src/dev-plugin-security-enforcement-warning.test.ts` at revision `7552e03375` (pre-#10120), unbuilt dependency closure, `vitest run --testTimeout=1`. |
 | `plugin-dev-assertion.job-log.txt` | The same file, same revision, same unbuilt closure, no timeout override -- the exact condition #10112 measured, reproducing `AssertionError: start() published the service: expected false to be true` verbatim. |
 | `incident-32333709633-published-excerpt.job-log.txt` | Verbatim from the triage comment the bot **posted** on PR #10008 for queue build `32333709633` (comment `5351634659`), read back through the API. This is what a human actually saw during the 2026-08-20 incident. |
+| `run-37374282440.jobs.json` | The CI queue build that ejected PR #21872 on 2026-10-05 with nothing failing, read back through `GET /repos/{owner}/{repo}/actions/runs/37374282440/jobs?filter=all` on 2026-10-06 and trimmed to the fields the script reads (id, names, urls, status, conclusion, runner id/name, step name/status/conclusion/number). `Test Core (5/6)` is `cancelled` with `runner_name: ""` and no steps; `Test Core` fails only in `Verify test shard results`. |
+| `run-37371558473.jobs.json` | The same PR's earlier CI queue build that day, read and trimmed the same way: eight jobs `cancelled` with no runner (`Build Core`, five `Test Core` shards, two `Dogfood Regression Gate` shards), and two aggregates failing only in their `Verify … results` steps. |
+| `check-run-111979038621.annotations.json` | The annotations of `Test Core (5/6)` above, read through `GET /repos/{owner}/{repo}/check-runs/111979038621/annotations`, trimmed to path, lines, level, title and message. The `failure` entry is the platform's own "The job was not acquired by Runner of type hosted even after multiple attempts". |
 
 The first two are a **pair**, and the pairing is the point: their `FAIL` lines
 are byte-identical and their reason lines are opposite diagnoses. Scenario `E3`
@@ -29,3 +32,8 @@ worktree with no `packages/plugins/plugin-security/dist`, run
 `packages/plugins/plugin-dev/node_modules/.bin/vitest run <file>` (add
 `--testTimeout=1` for the timeout leg), then replace every ESC byte with
 `\u001b` before writing the file back here.
+
+The three limb (3) files are the records of a runner outage, not of a test
+failure: scenarios `N1`/`N2` run the shipped script over them unchanged, and
+`N7` uses the annotation with the job's `runner_name` filled in, so the
+annotation leg is exercised on its own.