Deno npm shim breaks SS58 decoding in @pezkuwi/api type registry,
causing PezspCoreCryptoAccountId32 to receive 48-byte SS58 strings
instead of 32-byte public keys. Added inline ss58ToHex decoder and
explicit hex-based nonce fetching to avoid all SS58 → AccountId32
conversions at the API level. Also adds P2P E2E test script (45/45).
