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Add a deterministic one-member development signer with native Tempo headers, DKG outcomes, and Commonware finalization framing. Keep epoch rotation and checkpoint restoration in the pure core, without mining, RPC, or CLI integration.
Document that preparing genesis only clears its consensus context. Cover nonempty extra data, removal of an existing context, and repeated preparation across supported hardforks.
Share header metadata preparation and validation without cloning the full header. Replace the single-format dispatcher with a fail-closed hardfork allowlist and reserve certificate capacity using codec and type sizes. Preserve genesis handling, validation order, certificate framing, and checkpoint behavior. Keep module visibility until production integration.
Use NonZeroU64 directly for epoch division and remainder operations. The current CI nightly flags the redundant get calls with clippy::needless_nonzero_get under warnings-as-errors. Keep the get calls needed for identity metadata and subtraction.
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Adds the local signing core for Tempo block certificates in Anvil.
This draft covers the core portion of OSS-1188. Mining, RPC/CLI wiring, and end-to-end verification are still to follow.