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.

dist/agents/po.txt

@@ -210,9 +210,27 @@ The LLM will:
 - Create a folder structure to organize the sharded documents
 - Maintain all content integrity including code blocks, diagrams, and markdown formatting
 
-## Recommended Method: @kayvan/markdown-tree-parser
+## Primary Method: Automatic with markdown-tree
 
-[[LLM: First, suggest the user install and use the @kayvan/markdown-tree-parser tool if the md-tree command is unavailable so we can have the best performance and reliable document sharding. Let the user know this will save cost of having the LLM to the expensive sharding operation. Give instructions for MPV NPX and PNPM global installs.]]
+[[LLM: First, check if markdownExploder is set to true in bmad-core/core-config.yml. If it is, attempt to run the command: `md-tree explode {input file} {output path}`.
+
+If the command succeeds, inform the user that the document has been sharded successfully and STOP - do not proceed further.
+
+If the command fails (especially with an error indicating the command is not found or not available), inform the user: "The markdownExploder setting is enabled but the md-tree command is not available. Please either:
+
+1. Install @kayvan/markdown-tree-parser globally with: `npm install -g @kayvan/markdown-tree-parser`
+2. Or set markdownExploder to false in bmad-core/core-config.yml
+
+**IMPORTANT: STOP HERE - do not proceed with manual sharding until one of the above actions is taken.**"
+
+If markdownExploder is set to false, inform the user: "The markdownExploder setting is currently false. For better performance and reliability, you should:
+
+1. Set markdownExploder to true in bmad-core/core-config.yml
+2. Install @kayvan/markdown-tree-parser globally with: `npm install -g @kayvan/markdown-tree-parser`
+
+I will now proceed with the manual sharding process."
+
+Then proceed with the manual method below ONLY if markdownExploder is false.]]
 
 ### Installation and Usage
 
@@ -245,19 +263,19 @@ If the user has @kayvan/markdown-tree-parser installed, use it and skip the manu
 
 ---
 
-## Manual Method (if @kayvan/markdown-tree-parser is not available)
+## Manual Method (if @kayvan/markdown-tree-parser is not available or user indicated manual method)
 
 [[LLM: Only proceed with the manual instructions below if the user cannot or does not want to use @kayvan/markdown-tree-parser.]]
 
 ### Task Instructions
 
-### 1. Identify Document and Target Location
+1. Identify Document and Target Location
 
 - Determine which document to shard (user-provided path)
 - Create a new folder under `docs/` with the same name as the document (without extension)
 - Example: `docs/prd.md` → create folder `docs/prd/`
 
-### 2. Parse and Extract Sections
+2. Parse and Extract Sections
 
 [[LLM: When sharding the document:
 
@@ -267,7 +285,7 @@ If the user has @kayvan/markdown-tree-parser installed, use it and skip the manu
    - Extract the section heading and ALL content until the next level 2 section
    - Include all subsections, code blocks, diagrams, lists, tables, etc.
    - Be extremely careful with:
-     - Fenced code blocks (```) - ensure you capture the full block including closing backticks
+     - Fenced code blocks (```) - ensure you capture the full block including closing backticks and account for potential misleading level 2's that are actually part of a fenced section example
      - Mermaid diagrams - preserve the complete diagram syntax
      - Nested markdown elements
      - Multi-line content that might contain ## inside code blocks
@@ -286,7 +304,7 @@ For each extracted section:
 
 2. **Adjust heading levels**:
 
-   - The level 2 heading becomes level 1 (# instead of ##)
+   - The level 2 heading becomes level 1 (# instead of ##) in the sharded new document
    - All subsection levels decrease by 1:
 
    ```txt
@@ -821,6 +839,10 @@ Manual Test Steps: [[LLM: Include how if possible the user can manually test the
 [[LLM: (SM Agent) When Drafting Story, leave next prompt in place for dev agent to remove and update - remove this line to the SM]]
 [[LLM: (Dev Agent) Anything the SM needs to know that deviated from the story that might impact drafting the next story.]]
 
+### File List
+
+[[LLM: (Dev Agent) List every new file created, or existing file modified in a bullet list.]]
+
 ### Change Log
 
 [[LLM: (SM Agent) When Drafting Story, leave next prompt in place for dev agent to remove and update- remove this line to the SM]]
@@ -828,6 +850,10 @@ Manual Test Steps: [[LLM: Include how if possible the user can manually test the
 
 | Date | Version | Description | Author |
 | :--- | :------ | :---------- | :----- |
+
+## QA Results
+
+[[LLM: QA Agent Results]]
 ==================== END: templates#story-tmpl ====================
 
 ==================== START: checklists#po-master-checklist ====================