Perform read-only health checks on DeepSeek Harness session files with dsh-session-health

`dsh-session-health` is a DeepSeek Harness session diagnosis plugin maintained by `omdsh-dev`. It performs read-only scans on multi-frame zstd session files under `$DSH_HOME/sessions`, detects torn, corrupted, empty sessions and stray residues, registers the `session_health` tool, and outputs JSON reports. This article verifies the installation commands, detection items and deep mode restrictions against the community directory page, GitHub source code and official Harness documentation.