test(java-oracle): DnsRun records DNS as Java FILIUS runs it

A resolver's lookup on the new dns-lan network (A, MX, a referral by NS,
an unknown name, a missing server): every frame and the call's result.
ScenarioNetwork installs a scenario's DNS servers. The Swift comparison
reads only scenarios with a Swift result.

Measured: Java's text messages (ID=... QR=... header, question and record
lines), no question in the answer, RCODE 0 always, a referral in the answer
section, an iterative resolver waiting 5 RTT per query.

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

packages/core/test/oracle.test.ts

@@ -3,7 +3,7 @@
 // same file (<name>.swift.json, written by tools/swift-oracle/run.sh).
 // Every trace event must match: identity, time, node, headers, detail.
 
-import { readdirSync, readFileSync } from 'node:fs';
+import { existsSync, readdirSync, readFileSync } from 'node:fs';
 import { dirname, join } from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { describe, expect, it } from 'vitest';
@@ -272,8 +272,9 @@ function run(scenario: Scenario): Record<string, unknown> {
   };
 }
 
+// Scenarios with a Swift result (the Java comparisons have scenarios of their own).
 const scenarioNames = readdirSync(scenarioDirectory)
-  .filter((name) => name.endsWith('.scenario.json'))
+  .filter((name) => name.endsWith('.scenario.json') && existsSync(join(scenarioDirectory, name.replace('.scenario.json', '.swift.json'))))
   .map((name) => name.replace('.scenario.json', ''))
   .sort();