fix(leios): support prototype vote wire format

[wolf31o2]

Summary by cubic

Adds support for the prototype Leios vote wire format and makes it the preferred encoding. We now handle 3-element votes [announcing_rb_hash, voter_id, signature] while keeping legacy 2- and 4-element shapes.

• New Features
  • Added LeiosPrototypeVote in ledger/common with strict UnmarshalCBOR and signature validation.
  • Extended MsgVotesOffer in protocol/leiosnotify with PrototypeVotes; encoder prefers it, decoder sets exactly one of Votes/FullVotes/PrototypeVotes.
  • Added NewMsgVotesOfferPrototype(...) and updated tests (round-trip and invalid signature cases).

^{Written for commit 3d94b8d. Summary will update on new commits.}

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f8260d3c-41ec-4971-a323-c7dfea119d60

📥 Commits

Reviewing files that changed from the base of the PR and between b170eaf and 3d94b8d.

📒 Files selected for processing (4)

• ledger/common/leios.go
• ledger/common/leios_test.go
• protocol/leiosnotify/messages.go
• protocol/leiosnotify/messages_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/leios-prototype-votes-2821

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[cubic-dev-ai]

All reported issues were addressed across 3 files

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>