feat(network): verify attester votes (Part 2)

[randygrok]

Summary

This is Part 2 of the prod-readiness split, stacked on #394.

Changes:

• Decode MsgAttest vote bytes as CometBFT votes.
• Verify vote type, height, round, validator address, and consensus-key signature.
• Pin attester votes to the sequencer's canonical stored BlockID.
• Store signatures keyed by consensus address and query them in validator-index order.
• Enforce strict > 2/3 quorum semantics for attestation confirmation.
• Wire the network keeper to the adapter block store through the server startup path.

Validation

• go test ./modules/network/...

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