dsh-bundle-dedup-guard: Preventing Duplicate Loader Entry ID Crashes During DSH Plugin Startup

`dsh-bundle-dedup-guard` is a guard plugin for DeepSeek Harness (DSH) that addresses startup crashes caused by `duplicate loader entry id` errors when an aggregate bundle and its subplugins are configured simultaneously. It detects duplicate IDs, audits the plugin environment (including vendor tree and junctions), and reports diagnostic information such as unresolved bundles and conflicting pairs. Once installed, the plugin runs automatically during loading and can also be checked manually via the CLI. It is a read-only diagnostic tool suitable for monitoring in development and production environments.