fix: support proof-bearing validator joins

[MuncleUscles]

Summary

• replace both retired validator-join ABI surfaces with proof-bearing calls:
  • validatorJoin(uint256[2],bytes)
  • vestingValidatorJoin(uint256[2],bytes,uint256)
• export a private-key-local operator registration helper matching the consensus EIP-191 domain and Solidity ABI encoding
• resolve the live chain ID and ValidatorWalletFactory registrar, bind each proof to the joining owner, and verify it before submission
• accept only proof packages in the SDK actions; raw operator keys are never retained

Root cause

Consensus C4 requires a secp256k1 public key and a chain/registrar/owner-bound proof of possession whenever a validator wallet is created. The SDK still encoded the removed address-only and zero-argument join surfaces, which caused Explorer vesting joins to revert and left JS/CLI/Python tooling unable to join validators.

Validation

• npm test -- --run — 122/122, no type errors
• npm run build
• targeted ESLint on the changed source/tests
• git diff --check
• deterministic proof vector matches the exact consensus helper; wrong-key/domain and invalid-registration coverage included

Companion consumers

• https://github.com/genlayerlabs/genlayer-explorer/pull/485
• fix: sign proof-bearing validator joins genlayer-cli#405
• https://github.com/genlayerlabs/genlayer-e2e/pull/716

Depends-On: https://github.com/genlayerlabs/genlayer-consensus/pull/1285

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