The router migrated from generate_device_keypair → register_device
(returns signing_public_key + deploy_public_key with private keys
staying internal to WASM). Test still mocked the old function under
the old return shape (public_key_hex / private_key_base64), so the
router's state.wasm.register_device() call failed with
"is not a function".
Updates the mock function name, response shape, and assertion to the
current contract. Test intent (treat the WASM return as a JS object,
not a JSON string) is preserved.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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