iterate-plugin: Closed-loop review, fix, and validate in DSH

`iterate-plugin` is an MIT-licensed DSH plugin designed to address the issue where code reviews remain at the suggestion stage and lack a feedback loop for fixes. It offers two modes: the dry-run mode performs read-only multi-round reviews, supporting parallel dimension review, deterministic aggregation, and breakpoint recovery to ensure zero file modifications; while the normal mode implements autonomous closed-loop iteration, encompassing review, triage, atomic fixes, verification, and failure rollback, stopping automatically once convergence is reached. It is recommended to use the dry-run mode to identify issues first, then switch to the normal mode to execute the fixes. The plugin includes 13 core tools covering configuration, decision records, and state management, and supports marking intentional findings via the UI to filter subsequent reviews. Additionally, it features historical audit logs, runtime cleanup, and a Web UI layer (such as a triage panel and a convergence dashboard). Users can...