dsh-session-toolkit: Merge and install DSH local plugins including session identity, prompts, auto-recovery, and Web restart.

dsh-session-toolkit is a comprehensive plugin toolkit for DeepSeek Harness (current version 0.1.4, MIT license). It aims to merge six local plugin capabilities—identity, prompt, recovery, restart, logs, and inter-session messages—into a single package to reduce the cost of separate configuration and maintenance for developers. Its core functions include: configurable session identity management; global and workspace prompt injection, supporting prefix and longest path matching based on the working directory; dynamic file referencing with automatic skipping and reporting of errors on failure; session auto-recovery with a concurrency limit of 3 and failure isolation; Web service restart without UAC elevation; and tools for sending and viewing inter-session messages. This plugin is distributed as a `dsh.bundle.patch` and must be added using `dsh plugin add`.