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feat(sync): Add signed packet attestations (T-438) - #379
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Why: Client handoffs need tamper-evident proof without shipping the memory body. What: - src/sync/attestation.ts: canonical JSON hashing, Ed25519 signing of the hash, chain hashes, verification and chain-order validation. - src/cli/attest.ts + CLI: keygen (0600 private key), sign, verify. - test/attestation.test.ts: sign/verify, tamper rejection, chain reorder, canonical key order. Verification: bun test 1510 pass / 0 fail; tsc clean; build 434 modules. Co-authored-by: CommandCodeBot <noreply@commandcode.ai>
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Ed25519 attestations over canonical packet hashes with tamper-evident chains; CLI keygen/sign/verify. Gate 1510/0.