dsh-rule-engine: Delegating AGENTS.md rules to DSH for execution

dsh-rule-engine is a DSH Rule Execution Engine v3 plugin that uses ~/.dsh/AGENTS.md as the single source of truth, transforming document rules into runtime objects that are checkable, executable, and auditable. It enforces rules through tool guarding, text detection, timing checks, and audit logs, supporting dynamic parsing so that adding, deleting, or modifying rules does not require rewriting the plugin. Its main features include the /guard command for managing status, rules, logs, and whitelists, support for automatic mounting of bundle specifications, and capabilities such as task contracts, anti-over-engineering mode, and LLM adjudication. When there is no AGENTS.md in the environment, the engine loads without errors and does not produce false positives. The installation method is to use the dsh plugin --profile web add dsh-rule-engine command or manually...