Implement keetanetwork-block crate with block and operation types#3

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mamonet wants to merge 25 commits intomainfrom

Commits on Jan 10, 2026

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Embed test samples and add malformed input tests
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Replace manual DER parsing with SliceReader in SignersIter
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Commits on Feb 4, 2026

Add extract_operations_slice for block operations parsing
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Commits on Feb 5, 2026