feat(rpc): reconstruct attester commits deterministically (Part 3)

[randygrok]

Summary

This is Part 3 of the prod-readiness split, stacked on #395.

Changes:

• Add the AttesterSet query endpoint for the fixed ordered attester set.
• Reconstruct attester-mode commits using the full set, with absent entries for non-signers.
• Gate reconstructed commits on strict quorum before returning them.
• Make /validators return the same full attester set used by /commit.
• Add tests for deterministic commit reconstruction and validator ordering.

Validation

• go test ./pkg/adapter ./pkg/rpc/core ./modules/network/...

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