chore: upgrade BMAD framework to skill-based architecture

Migrates from slash-command files (.claude/commands, .cursor/commands)
to the new skill-based architecture with workflow step files.

_bmad/bmm/workflows/qa-generate-e2e-tests/checklist.md

@@ -1,33 +0,0 @@
-# Quinn Automate - Validation Checklist
-
-## Test Generation
-
-- [ ] API tests generated (if applicable)
-- [ ] E2E tests generated (if UI exists)
-- [ ] Tests use standard test framework APIs
-- [ ] Tests cover happy path
-- [ ] Tests cover 1-2 critical error cases
-
-## Test Quality
-
-- [ ] All generated tests run successfully
-- [ ] Tests use proper locators (semantic, accessible)
-- [ ] Tests have clear descriptions
-- [ ] No hardcoded waits or sleeps
-- [ ] Tests are independent (no order dependency)
-
-## Output
-
-- [ ] Test summary created
-- [ ] Tests saved to appropriate directories
-- [ ] Summary includes coverage metrics
-
-## Validation
-
-Run the tests using your project's test command.
-
-**Expected**: All tests pass ✅
-
----
-
-**Need more comprehensive testing?** Install [Test Architect (TEA)](https://bmad-code-org.github.io/bmad-method-test-architecture-enterprise/) for advanced workflows.