v4-v6 upgrade improvement and warning about file auto backup

bmad/bmm/testarch/knowledge/nfr-criteria.md

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+# Non-Functional Review Criteria
+
+- **Security**
+  - PASS: auth/authz, secret handling, and threat mitigations in place.
+  - CONCERNS: minor gaps with clear owners.
+  - FAIL: critical exposure or missing controls.
+- **Performance**
+  - PASS: metrics meet targets with profiling evidence.
+  - CONCERNS: trending toward limits or missing baselines.
+  - FAIL: breaches SLO/SLA or introduces resource leaks.
+- **Reliability**
+  - PASS: error handling, retries, health checks verified.
+  - CONCERNS: partial coverage or missing telemetry.
+  - FAIL: no recovery path or crash scenarios unresolved.
+- **Maintainability**
+  - PASS: clean code, tests, and documentation shipped together.
+  - CONCERNS: duplication, low coverage, or unclear ownership.
+  - FAIL: absent tests, tangled implementations, or no observability.
+- Default to CONCERNS when targets or evidence are undefined—force the team to clarify before sign-off.
+
+_Source: Murat NFR assessment guidance._