{"envelope_version":"CubeObjectV1","envelope_bytes":192,"flit_bytes":64,"manifold_u64s":4,"auth_hash_bytes":32,"capability_hmac_bytes":32,"lease_nonce_bytes":32,"efuse_raw_bits_bytes":32,"fields":{"adapter_id":"u64","capability_hmac":"[u8; 32]","efuse_raw_bits":"[u8; 32]","flit":{"auth_hash":"[u8; 32]  // HMAC-SHA256 or PUF projection","manifold":"[u64; 4]  // 32B topology + flags + metadata"},"lease_nonce":"[u8; 32]","payload_hash":"u64","request_hash":"u64","reserved_padding":"[u8; 4]","sequence_id":"u32"},"note":"This is the WIRE contract surface. The production admit gate runs in cubie-tf bare-metal Rust on customer infrastructure. This endpoint never holds capability HMAC keys."}