feat: Add a foundational set of BMM, BMB, TEA, and Core workflows, agent definitions, and supporting templates.

_bmad/tea/workflows/testarch/atdd/workflow-plan.md

@@ -0,0 +1,21 @@
+    # Workflow Plan: testarch-atdd
+
+    ## Create Mode (steps-c)
+    - step-01-preflight-and-context.md
+
+- step-02-generation-mode.md
+- step-03-test-strategy.md
+- step-04-generate-tests.md
+- step-05-validate-and-complete.md
+
+  ## Validate Mode (steps-v)
+  - step-01-validate.md
+
+  ## Edit Mode (steps-e)
+  - step-01-assess.md
+  - step-02-apply-edit.md
+
+  ## Outputs
+  - {test_artifacts}/atdd-checklist-{story_id}.md
+
+- Failing acceptance tests under {project-root}/tests