feat(attester): attest from fixed genesis set (Part 4)

[randygrok]

Summary

This is Part 4 of the prod-readiness split, stacked on #396.

Changes:

• Make the attester command assert genesis registration instead of joining the set dynamically.
• Sign and broadcast the same CometBFT vote payload.
• Use the consensus-key address for attester set lookup and MsgAttest.
• Poll /block for latest produced height so attester mode does not deadlock on /status.
• Add coverage for attester RPC helpers and command behavior.

Validation

• go test ./server

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