v4-v6 upgrade improvement and warning about file auto backup

bmad/bmm/workflows/testarch/atdd/instructions.md

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+<!-- Powered by BMAD-CORE™ -->
+
+# Acceptance TDD v3.0
+
+```xml
+<task id="bmad/bmm/testarch/atdd" name="Acceptance Test Driven Development">
+  <llm critical="true">
+    <i>Preflight requirements:</i>
+    <i>- Story is approved with clear acceptance criteria.</i>
+    <i>- Development sandbox/environment is ready.</i>
+    <i>- Framework scaffolding exists (run `*framework` if missing).</i>
+  </llm>
+  <flow>
+    <step n="1" title="Preflight">
+      <action>Confirm each requirement above; halt if any are missing.</action>
+    </step>
+    <step n="2" title="Author Failing Acceptance Tests">
+      <action>Clarify acceptance criteria and affected systems.</action>
+      <action>Select appropriate test level (E2E/API/Component).</action>
+      <action>Create failing tests using Given-When-Then with network interception before navigation.</action>
+      <action>Build data factories and fixture stubs for required entities.</action>
+      <action>Outline mocks/fixtures infrastructure the dev team must provide.</action>
+      <action>Generate component tests for critical UI logic.</action>
+      <action>Compile an implementation checklist mapping each test to code work.</action>
+      <action>Share failing tests and checklist with the dev agent, maintaining red → green → refactor loop.</action>
+    </step>
+    <step n="3" title="Deliverables">
+      <action>Output failing acceptance test files, component test stubs, fixture/mocks skeleton, implementation checklist, and data-testid requirements.</action>
+    </step>
+  </flow>
+  <halt>
+    <i>If acceptance criteria are ambiguous or the framework is missing, halt and request clarification/set up.</i>
+  </halt>
+  <notes>
+    <i>Consult `{project-root}/bmad/bmm/testarch/tea-index.csv` to identify ATDD-related fragments (fixture-architecture, data-factories, component-tdd) and load them from `knowledge/`.</i>
+    <i>Start red; one assertion per test; keep setup visible (no hidden shared state).</i>
+    <i>Remind devs to run tests before writing production code; update checklist as tests turn green.</i>
+  </notes>
+  <output>
+    <i>Failing acceptance/component test suite plus implementation checklist.</i>
+  </output>
+</task>
+```

bmad/bmm/workflows/testarch/atdd/workflow.yaml

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+# Test Architect workflow: atdd
+name: testarch-atdd
+description: "Generate failing acceptance tests before implementation."
+author: "BMad"
+
+config_source: "{project-root}/bmad/bmm/config.yaml"
+output_folder: "{config_source}:output_folder"
+user_name: "{config_source}:user_name"
+communication_language: "{config_source}:communication_language"
+date: system-generated
+
+installed_path: "{project-root}/bmad/bmm/workflows/testarch/atdd"
+instructions: "{installed_path}/instructions.md"
+
+template: false
+
+tags:
+  - qa
+  - atdd
+  - test-architect
+
+execution_hints:
+  interactive: false
+  autonomous: true
+  iterative: true