spark: add verified Project Euler even Fibonacci sum solver (result: 4613732)

wizard-work/spark/fib_verification.json

@@ -0,0 +1,8 @@
+{
+  "artifact": "fib_even_sum.py + verification",
+  "created": "2026-10-30T00:00:00Z",
+  "purpose": "Project Euler Problem 2 solver: sum of even Fibonacci numbers below 4M",
+  "result": 4613732,
+  "verified": true,
+  "verification_command": "python3 /root/.hermes/wizard-outputs/spark/fib_even_sum.py"
+}