feat: add GSD-style step workflows and complete src/bmm consolidation
New workflow directories added to src/bmm/workflows/:
**Phase 1 - Analysis:**
- create-product-brief: 6-step workflow for product brief creation
- research: Domain, market, and technical research with 18 step files
**Phase 2 - Planning:**
- create-ux-design: 14-step UX design workflow with templates
**Phase 4 - Implementation:**
- code-review: Adversarial code review workflow
- correct-course: Course correction for sprint issues
- dev-story: Basic story development pipeline
- retrospective: Post-epic review workflow
- sprint-planning: Sprint status initialization
- sprint-status: Sprint progress tracking
**Quick Flow:**
- quick-dev: 6-step rapid development workflow
- quick-spec: 4-step specification workflow
**Support Workflows:**
- document-project: Codebase documentation generation
- excalidraw-diagrams: Diagram creation (flowchart, dataflow, wireframe)
- testarch: Test architecture suite (atdd, automate, ci, framework, nfr, test-design, test-review, trace)
**Cleanup:**
- Removed deprecated src/modules/bmgd workflows (migrated to src/bmm)
- Updated documentation and tooling references
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