dsh-retention-settlement-proof: DeepSeek Harness Offline Retention Settlement Proof

`dsh-retention-settlement-proof` is an offline retention settlement evidence generation plugin for DeepSeek Harness. It consumes pre-recorded receipts to verify whether the subject is completely absent from surfaces such as `persistence-list` and `session-index`, thereby proving that the session has “lapsed.” The tool only generates a report containing hashes and verification results; it does not modify files or include sensitive information. It supports both CLI and MCP integration modes and is intended to address the challenge of programmatically verifying session deletion status.