Verifiable research-report engine for DeepSeek Harness: content-addressed evidence ledger (claim-snapshot binding, tamper-evident) plus versioned sealed reports with per-claim verification verdicts and a manifest-sealed directory.
Undo what an agent did to a directory: content-addressed snapshots, one-command rewind, and an undo you can undo. Works in any folder — git or not. DSH plugin + skill, zero dependencies.