dsh-supergroup: Equipping DSH with a multi-session dispatch layer capable of reconciliation

dsh-supergroup is a DSH session orchestration plugin (MIT, version 1.0.1) maintained by LXS652. It groups a primary session with multiple execution sessions, dispatches based on sessionId, and collects results based on rpcId. It automatically reconciles and heals itself after restart based on the on-disk ledger, never auto-retransmitting. It supports multiple supergroups, sidebar panels, member permission isolation, and coordination tools ms2_*. Installation simply requires appending an 'insert' entry pointing to src/plugin2.mjs at the end of the profile's cordis.patch.yml, or installing via the bundle mechanism. [Written according to the GitHub README for verification]