chore: add BMAD agent workflows and configuration system

- Add comprehensive agent workflow definitions for 8 specialized roles (analyst, architect, developer, product manager, scrum master, technical writer, UX designer, QA engineer)
- Add 35+ workflow definitions covering analysis, planning, solutioning, and implementation phases
- Add BMAD configuration system with agent, task, tool, workflow, and file manifests
- Add BMM (Business Model Methodology) documentation including quick-start guides, architecture references, and workflow analysis
- Add test architecture knowledge base with 20+ testing patterns and best practices
- Add team configuration templates and party mode setup for collaborative development
- Establish foundation for enterprise agentic development framework with adaptive scaling capabilities

.bmad/bmm/workflows/4-implementation/code-review/backlog_template.md

@@ -0,0 +1,12 @@
+# Engineering Backlog
+
+This backlog collects cross-cutting or future action items that emerge from reviews and planning.
+
+Routing guidance:
+
+- Use this file for non-urgent optimizations, refactors, or follow-ups that span multiple stories/epics.
+- Must-fix items to ship a story belong in that story’s `Tasks / Subtasks`.
+- Same-epic improvements may also be captured under the epic Tech Spec `Post-Review Follow-ups` section.
+
+| Date | Story | Epic | Type | Severity | Owner | Status | Notes |
+| ---- | ----- | ---- | ---- | -------- | ----- | ------ | ----- |