perf(ci): make the triage budget operator-tunable and raise it

.github/workflows/qwen-triage.yml

@@ -370,7 +370,16 @@ jobs:
 
   triage:
     needs: ['authorize']
-    timeout-minutes: 30
+    # TUNABLE WITHOUT A CODE CHANGE: set the repository variable in
+    # Settings → Variables. Why the fallback is 60: the fixed 30 was
+    # measurably clipping the distribution — 22 successful triage jobs
+    # sampled on 2026-08-09 ran median 5.8m / p90 22.3m / max 29.5m, and
+    # five substantial PRs (8723, 8726, 8731, 8764, 8801) died at exactly
+    # the cap, each discarding a full agent run. Triage is advisory, so
+    # the worst case a longer budget risks is one held runner; a killed
+    # run wastes the same runner AND the work. The fromJSON(vars.X || N)
+    # form is probe-verified on a live runner (see #8731).
+    timeout-minutes: '${{ fromJSON(vars.QWEN_TRIAGE_TIMEOUT_MINUTES || 60) }}'
     concurrency:
       # GitHub evaluates concurrency before the job `if`, but after `needs`.
       # Keep non-runnable PR/comment triggers out of the shared per-number

scripts/tests/qwen-triage-workflow.test.js

@@ -5847,3 +5847,20 @@ describe('qwen-triage build-process guard', () => {
     }
   }, 30000);
 });
+
+describe('triage job budget', () => {
+  // The fixed 30-minute cap was measurably clipping the distribution: 22
+  // successful triage jobs sampled on 2026-08-09 ran median 5.8m / p90
+  // 22.3m / max 29.5m, and five substantial PRs died at exactly the cap,
+  // each discarding a full agent run for nothing — triage is advisory, so
+  // a killed run wastes the runner AND the work it was about to publish.
+  // The budget is a repository variable so the next resize needs no PR;
+  // the fallback keeps an unconfigured repo bounded. Both halves pinned so
+  // neither the knob nor its default can silently vanish.
+  it('is operator-tunable with a bounded fallback', () => {
+    const triageJob = job('triage');
+    expect(triageJob).toContain(
+      "timeout-minutes: '${{ fromJSON(vars.QWEN_TRIAGE_TIMEOUT_MINUTES || 60) }}'",
+    );
+  });
+});