docs(audit): scaffold prose-audit workspace

docs/audit/README.md

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+# Documentation Audit Workspace
+
+This directory holds the working artifacts for the repo-wide prose
+documentation audit.
+
+- `fragments/` — one Markdown findings fragment per subsystem cluster
+  (`NN-<cluster>.md`), produced by the read-only verifier pass. Each fragment
+  records claim-by-claim findings (claim, verdict, code evidence, severity,
+  proposed fix) for its docs.
+- The fragments are aggregated, deduplicated by code area, and summarized into
+  the top-level report `MxAccessGateway-doc-audit.md`.
+
+Design: [`../plans/2026-06-03-documentation-audit-design.md`](../plans/2026-06-03-documentation-audit-design.md)
+Plan: [`../plans/2026-06-03-documentation-audit-implementation.md`](../plans/2026-06-03-documentation-audit-implementation.md)