feat: transform QA agent into Test Architect with advanced quality capabilities

- Add 6 specialized quality assessment commands
  - Implement risk-based testing with scoring
  - Create quality gate system with deterministic decisions
  - Add comprehensive test design and NFR validation
  - Update documentation with stage-based workflow integration

bmad-core/checklists/po-master-checklist.md

@@ -8,12 +8,10 @@ PROJECT TYPE DETECTION:
 First, determine the project type by checking:
 
 1. Is this a GREENFIELD project (new from scratch)?
-
    - Look for: New project initialization, no existing codebase references
    - Check for: prd.md, architecture.md, new project setup stories
 
 2. Is this a BROWNFIELD project (enhancing existing system)?
-
    - Look for: References to existing codebase, enhancement/modification language
    - Check for: brownfield-prd.md, brownfield-architecture.md, existing system analysis
 
@@ -347,7 +345,6 @@ Ask the user if they want to work through the checklist:
 Generate a comprehensive validation report that adapts to project type:
 
 1. Executive Summary
-
    - Project type: [Greenfield/Brownfield] with [UI/No UI]
    - Overall readiness (percentage)
    - Go/No-Go recommendation
@@ -357,42 +354,36 @@ Generate a comprehensive validation report that adapts to project type:
 2. Project-Specific Analysis
 
    FOR GREENFIELD:
-
    - Setup completeness
    - Dependency sequencing
    - MVP scope appropriateness
    - Development timeline feasibility
 
    FOR BROWNFIELD:
-
    - Integration risk level (High/Medium/Low)
    - Existing system impact assessment
    - Rollback readiness
    - User disruption potential
 
 3. Risk Assessment
-
    - Top 5 risks by severity
    - Mitigation recommendations
    - Timeline impact of addressing issues
    - [BROWNFIELD] Specific integration risks
 
 4. MVP Completeness
-
    - Core features coverage
    - Missing essential functionality
    - Scope creep identified
    - True MVP vs over-engineering
 
 5. Implementation Readiness
-
    - Developer clarity score (1-10)
    - Ambiguous requirements count
    - Missing technical details
    - [BROWNFIELD] Integration point clarity
 
 6. Recommendations
-
    - Must-fix before development
    - Should-fix for quality
    - Consider for improvement