docs: 100000-stamp load test (99999 ok, 1 fail)

WhatToChange: /Users/marchon/research/recommended-changes/2026-09-20-forgejo-ci-138
  How-to-implement-the-changes.md

What was actually done:
- Add debug-trace/20260920T174456Z-perf-load HTML/JSON

What was not done:
- (none)

debug-trace/20260920T174456Z-perf-load/perf-load.html

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+<!DOCTYPE html>
+<html lang="en"><head><meta charset="utf-8"><title>stamp load 20260920T174456Z</title>
+<style>
+body{font:15px/1.4 ui-sans-serif,system-ui;background:#0f1419;color:#e7ecf1;margin:1.5rem}
+table{border-collapse:collapse;width:100%;font-size:.85rem}
+th,td{border-bottom:1px solid #2a3542;padding:.35rem .4rem;text-align:right}
+th:first-child,td:first-child{text-align:left}
+code{font-family:ui-monospace,Menlo,monospace}
+</style></head><body>
+<h1>Stamp load test</h1>
+<p>API <code>https://api.veraetime.net</code> · wait:true · unique hashes · workers 32</p>
+<p>Run <code>20260920T174456Z</code> · 2026-09-20T17:44:56.145392Z → 2026-09-21T01:57:57.532089Z</p>
+<p><strong>JetStream:</strong> not used (standing ban on job-complete messages).</p>
+<table><thead><tr>
+<th>n</th><th>workers</th><th>wall s</th><th>rps</th><th>ok</th><th>fail</th>
+<th>min</th><th>avg</th><th>p50</th><th>p75</th><th>p80</th><th>p90</th><th>p95</th><th>max</th>
+<th>CPU% avg</th><th>RSS MB avg</th>
+</tr></thead><tbody><tr><td>100000</td><td>32</td><td>29581.29</td><td>3.4</td><td>99999</td><td>1</td><td>252.3</td><td>9463.4</td><td>9541.3</td><td>11891.6</td><td>12339.7</td><td>13309.0</td><td>14007.5</td><td>20582.6</td><td>0.0</td><td>0.0</td></tr></tbody></table>
+<p>Latency columns are milliseconds.</p>
+</body></html>

debug-trace/20260920T174456Z-perf-load/perf-load.json

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+{
+  "run_id": "20260920T174456Z",
+  "api": "https://api.veraetime.net",
+  "workers": 32,
+  "started": "2026-09-20T17:44:56.145392Z",
+  "ended": "2026-09-21T01:57:57.532089Z",
+  "jetstream": false,
+  "batches": [
+    {
+      "n": 100000,
+      "workers": 32,
+      "wall_s": 29581.287366541997,
+      "throughput_rps": 3.3805154847014975,
+      "ok": 99999,
+      "fail": 1,
+      "latency_ms": {
+        "min": 252.2662920091534,
+        "avg": 9463.434582126825,
+        "p50": 9541.323707999254,
+        "p75": 11891.625207994366,
+        "p80": 12339.704458005144,
+        "p90": 13308.997750005801,
+        "p95": 14007.45045900112,
+        "max": 20582.590415986488
+      },
+      "errors": [
+        {
+          "ok": false,
+          "status": 0,
+          "ms": 252.2662920091534,
+          "error": "RemoteDisconnected: Remote end closed connection without response"
+        }
+      ],
+      "host": {
+        "samples": 14646,
+        "proc_cpu_pct": {
+          "min": null,
+          "avg": null,
+          "p50": null,
+          "p95": null,
+          "max": null
+        },
+        "proc_rss_mb": {
+          "min": null,
+          "avg": null,
+          "max": null
+        },
+        "host_mem_available_gb": {
+          "min": null,
+          "avg": null
+        }
+      }
+    }
+  ]
+}