feat: test post cli: Vanilla Proof test command

[magik6k]

We had a pure-Go vanilla PoSt proof verifier for a while now, that never got used. Wrapped it into a tool to debug particularly confusing PoSt failures of the failed to generate window post+ no other information flavor.

This tool will show which specific vanilla proofs contained errors which for whatever reason don't get checked on the rust side until the actual proof is computed.

GOLOG_LOG_LEVEL=error ./curio-cu test wd vanilla --addr f0... --deadline 1

2025-10-06T12:20:53.913+0200	ERROR	main	curio/test-cli.go:499	Verified window post vanilla proofs	{"error": "comm_r invalid: sector 3245, partition 0", "elapsed": 0.001823394, "ok": false}
2025-10-06T12:20:54.168+0200	ERROR	main	curio/test-cli.go:499	Verified window post vanilla proofs	{"error": "comm_r invalid: sector 4567, partition 0", "elapsed": 0.005112741, "ok": false}