dsh-audit-log: DeepSeek Harness Runtime Data Flow Audit Log

`dsh-audit-log` is an audit plugin in the DeepSeek Harness (DSH) ecosystem for tracing modifications to data flows. It helps pinpoint data tampering in multi-plugin environments by operating in a read-only observation mode and recording the modifying plugin, the Fiber level, and the timestamp. It uses Dispatch-level diffing and Per-listener window attribution to precisely attribute modification sources, storing only parameter structure fingerprints to avoid leaking sensitive information. Users can query modification records for specific events via `ctx.auditLog`. Applicable scenarios include troubleshooting unexpected data flow changes, dependency tracing, and security auditing.