ExWeb3 / elixir_ethers / 271c39d0278cb3e2a59685b6f1b5c729ab9529ce

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Add EIP-191 personal message (personal_sign) support (#265)

Introduce Ethers.PersonalMessage with pure EIP-191 (version 0x45)
primitives — hash/1, recover/2, recover!/2 and verify/3 — plus a new
optional sign_message/2 signer callback implemented by the Local signer
(secp256k1) and the JsonRPC signer (personal_sign), exposed through
Ethers.sign_message/2 and Ethers.sign_message!/2.

Messages are treated as raw bytes exactly as given; 0x-prefixed strings
are signed as literal text, matching ethers.js string semantics. All
vectors are cross-checked against foundry's cast and anvil.

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

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