The crypto test PRNG was non-deterministic because setup_random() seeded
the state but grant_random_initialize_no_lock() overwrote it with
/dev/urandom on the first random call. Calling it before memset ensures
the initialized flag is set, preventing the overwrite.
Also adds --generate mode to crypto-tests for future vector regeneration,
updates checkpoint hashes for multisig_and_checkpoints (height 15) and
gen_no_attchments_in_coinbase (height 12), and replaces hardcoded Zano
addresses/URLs with Lethean equivalents in manual test scaffolding.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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