feat: enhance QA agent as senior developer with code review capabilities and major brownfield improvements

This release introduces significant enhancements across multiple areas:

QA Agent Transformation:
- Transform QA agent into senior developer role with active code refactoring abilities
- Add review-story task enabling QA to review, refactor, and improve code directly
- Integrate QA review step into standard development workflow (SM → Dev → QA)
- QA can fix small issues directly and leave checklist for remaining items
- Updated dev agent to maintain File List for QA review focus

Knowledge Base Improvements:
- Add extensive brownfield development documentation and best practices
- Clarify Web UI vs IDE usage with cost optimization strategies
- Document PRD-first approach for large codebases/monorepos
- Add comprehensive expansion packs explanation
- Update IDE workflow to include QA review step
- Clarify agent usage (bmad-master vs specialized agents)

Brownfield Enhancements:
- Create comprehensive Working in the Brownfield guide
- Add document-project task to analyst agent capabilities
- Implement PRD-first workflow option for focused documentation
- Transform document-project to create practical brownfield architecture docs
- Document technical debt, workarounds, and real-world constraints
- Reference actual files instead of duplicating content
- Add impact analysis when PRD is provided

Documentation Task Improvements:
- Simplify to always create ONE unified architecture document
- Add deep codebase analysis phase with targeted questions
- Focus on documenting reality including technical debt
- Include Quick Reference section with key file paths
- Add practical sections: useful commands, debugging tips, known issues

Workflow Updates:
- Update all 6 workflow files with detailed IDE transition instructions
- Add clear SM → Dev → QA → Dev cycle explanation
- Emphasize Gemini Web for brownfield analysis (1M+ context advantage)
- Support both PRD-first and document-first approaches

This release significantly improves the brownfield development experience and introduces a powerful shift-left QA approach with senior developer mentoring.

GUIDING-PRINCIPLES.md

@@ -77,39 +77,6 @@ See [Expansion Packs Guide](../docs/expansion-packs.md) for detailed examples an
 5. NEVER display template markup or LLM instructions to users
 6. Focus on clean output - all processing instructions stay internal
 
-## Examples
-
-### Good Dev Agent
-
-```yaml
-name: API Developer
-role: Creates REST APIs
-dependencies:
-  templates:
-    - api-endpoint-tmpl
-  tasks:
-    - implement-endpoint
-```
-
-### Good Planning Agent (Web)
-
-```yaml
-name: PRD Writer
-role: Creates comprehensive PRDs
-dependencies:
-  templates:
-    - prd-tmpl
-    - epic-tmpl
-    - story-tmpl
-  tasks:
-    - elicit-requirements
-    - analyze-market
-    - define-features
-  data:
-    - prd-best-practices
-    - market-analysis-guide
-```
-
 ## Remember
 
 - The power is in natural language orchestration, not code