update

docs/README.md

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+# Docs Index
+
+Active documents only.
+
+- [2026-03-17-audit-and-rebuild-plan.md](./2026-03-17-audit-and-rebuild-plan.md)
+- [2026-03-17-architecture-freeze.md](./2026-03-17-architecture-freeze.md)
+- [2026-03-17-runtime-security-tranche.md](./2026-03-17-runtime-security-tranche.md)
+
+Removed:
+
+- duplicate audit snapshots
+- duplicate rebuild plans
+- stale one-off implementation deltas that no longer matched the working tree