dsh-doctor: Diagnostic, Repair, and Rollback Tool for DeepSeek Harness Post-Crash

**Introduction** After tinkering with DeepSeek Harness (DSH) plugins for a long time, encountering situations like DSH crashes, startup failures, or corrupted profiles is inevitable. Since DSH lacks a built-in `doctor` command, users often have to guess the root cause based on error messages, rely on the luck of restarting the process, or manually sift through configuration files to troubleshoot. The `dsh-doctor` introduced below addresses this issue: it first performs read-only diagnostics to identify what is broken and why; then it offers stepwise repairs where every change is reversible, allowing for one-click rollback if something goes wrong. **What is this?** dsh-doctor (`@jorinyang/dsh-doctor`, current version 0.3.2) is a DSH plugin maintained by jorinyang, [intended to]...