ExWeb3 / elixir_ethers / 8dedc0d77d47107524951aea15d307145eacecdb

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Add universal signature verification (ERC-1271 + ERC-6492) (#266)

* Add universal signature verification (ERC-1271 + ERC-6492)

Add Ethers.Signature with verify_hash/4, verify_message/4 and
verify_typed_data/4, verifying any signature kind against an address:

- Plain EOA ECDSA signatures verify locally via ecrecover with no RPC
  round-trip (fast path).
- ERC-1271 smart-contract wallet signatures and ERC-6492-wrapped
  signatures from counterfactual (not-yet-deployed) wallets verify with
  a single deployless eth_call executing the ERC-6492
  UniversalSigValidator reference contract (bytecode vendored from
  viem / Ambire signature-validator, shipped as a constant in
  Ethers.Contracts.UniversalSigValidator — nothing is deployed).

Invalid signatures return {:ok, false}; {:error, reason} is reserved for
malformed input and RPC transport failures, so there are deliberately no
bang variants.

Tested against anvil with a minimal ERC-1271 wallet fixture and a
CREATE2 factory fixture covering deployed-wallet and counterfactual
(ERC-6492) verification, plus EOA fast-path tests proving no RPC usage.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Tighten UniversalSigValidator specs for dialyzer underspecs flag

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Update lib/ethers/signature.ex

* Use a variable for recovered address instead of piping into ==

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

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