refactor: Major v6 epic creation improvements and documentation overhaul

## Key Changes

### 1. Epic Creation Workflow Enhancements
- Added user-value focused epic structure principles (NO technical layer breakdown)
- Implemented multi-mode detection: CONTINUE, REPLACE, or UPDATE existing epics
- Added comprehensive anti-pattern examples showing wrong vs right epic breakdown
- Epics now created AFTER architecture for technically-informed story breakdown
- Added checkpoint protocol for interactive workflow progression

### 2. Removed Deprecated Solutioning Gate Check
- Deleted entire solutioning-gate-check workflow (682 lines)
- Replaced by new implementation-readiness workflow
- Cleaner separation of concerns in solutioning phase

### 3. PRD Template Simplification
- Removed hardcoded "Implementation Planning", "References", and "Next Steps" sections
- PRD now focuses purely on requirements, not workflow orchestration
- Epics/stories created as separate step after architecture

### 4. Documentation Overhaul (15+ docs updated)
- Updated quick-start guide with v6 workflow sequence
- Clarified that epics are created AFTER architecture, not during PRD
- Updated solutioning docs to reflect implementation-readiness pattern
- Improved agents-guide, brownfield-guide, enterprise docs
- Enhanced glossary, FAQ, and workflow reference documentation

### 5. Workflow Path Adjustments
- All 4 paths updated (enterprise/method × brownfield/greenfield)
- Version bumps across BMGD, BMM, and CIS workflow YAMLs
- Minor instruction file updates for consistency

### Files Changed
- 65 files total: 468 insertions, 978 deletions (net reduction of 510 lines)
- 4 files deleted (entire solutioning-gate-check workflow)
- 1 new directory added (implementation-readiness placeholder)

src/modules/bmm/docs/workflow-architecture-reference.md

@@ -72,7 +72,7 @@ The Decision Architecture workflow is a complete reimagining of how architectura
 ```
 Step 0: Validate workflow and extract project configuration
 Step 0.5: Validate workflow sequencing
-Step 1: Load PRD and understand project context
+Step 1: Load PRD (with FRs/NFRs) and understand project context
 Step 2: Discover and evaluate starter templates ⭐ NEW
 Step 3: Adapt facilitation style and identify remaining decisions
 Step 4: Facilitate collaborative decision making (with version verification)
@@ -122,11 +122,6 @@ Step 12: Final review and update workflow status
   - Non-Functional Requirements
   - Performance and compliance needs
 
-- **Epics** file with:
-  - User stories
-  - Acceptance criteria
-  - Dependencies
-
 - **UX Spec** (Optional but valuable) with:
   - Interface designs and interaction patterns
   - Accessibility requirements (WCAG levels)
@@ -280,7 +275,7 @@ workflow architecture
 
 The AI agent will:
 
-1. Load your PRD and epics
+1. Load your PRD (with FRs/NFRs)
 2. Identify critical decisions needed
 3. Facilitate discussion on each decision
 4. Generate a comprehensive architecture document