chore(perf): record the evidence PR of the J1 runtime baselines

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/performance/journey-baselines.json

@@ -15,7 +15,7 @@
                 "unit": "calls",
                 "slack": 0,
                 "updatedAt": "2026-10-01",
-                "evidencePr": null,
+                "evidencePr": 1788,
                 "evidenceRun": "https://github.com/4gray/iptvnator/actions/runs/36928706097",
                 "measuredWith": "pnpm run perf:journeys (ubuntu-latest, xvfb), identical in 3 runs"
             },
@@ -24,7 +24,7 @@
                 "unit": "mutations",
                 "slack": 0,
                 "updatedAt": "2026-10-01",
-                "evidencePr": null,
+                "evidencePr": 1788,
                 "evidenceRun": "https://github.com/4gray/iptvnator/actions/runs/36928706097",
                 "measuredWith": "pnpm run perf:journeys (ubuntu-latest, xvfb), identical in 3 runs"
             }