test(core): Swift oracle — the filius-ipad core built on Linux as the reference

tools/swift-oracle builds the unchanged Swift runtime (pinned 3b5ded0)
in Docker and replays JSON scenarios; the TypeScript engine must produce
the same trace events, results and end state. Five scenarios, 884
events, identical.

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

package.json

@@ -11,9 +11,10 @@
   },
   "scripts": {
     "test": "vitest run",
-    "typecheck": "tsc -b",
+    "typecheck": "tsc -b && tsc -p packages/core/test",
     "check": "npm run typecheck && npm run test",
-    "hooks": "git config core.hooksPath scripts/hooks"
+    "hooks": "git config core.hooksPath scripts/hooks",
+    "oracle": "tools/swift-oracle/run.sh"
   },
   "devDependencies": {
     "@types/node": "^20.19.0",