All 5 required SSRF test functions already exist in TH-05-ssrf-block.rs:
- IPv4 loopback (127.0.0.1:9999)
- IPv4 all interfaces (0.0.0.0)
- IPv6 loopback (::1)
- AWS metadata endpoint (169.254.169.254)
- Private network (10.0.0.1)
Tests compile and run successfully with cargo nextest.
Each test uses the JSON-RPC helper from bf-8zda6 correctly.
Tests are properly isolated with no shared state.
Closes bf-3bhy6
