refactor: comprehensive workflow modernization and standardization

## Major Improvements

### 1. Elicitation System Modernization
- Removed legacy `<elicit-required />` tag from workflow.xml
- Replaced with direct `<invoke-task halt="true">{project-root}/bmad/core/tasks/adv-elicit.xml</invoke-task>` pattern
- More explicit, self-documenting, and eliminates indirection layer
- Added strategic elicitation points across all planning workflows:
  - PRD: After success criteria, scope, functional requirements, and final review
  - Create-Epics-And-Stories: After epic proposals and each epic's stories
  - Architecture: After decisions, structure, patterns, implementation patterns, and final doc
  - Updated audit-workflow tag scanner to remove obsolete elicit-required reference

### 2. Input Document Discovery Streamlined
- Replaced verbose 19-line "Input Document Discovery" sections with single critical tag
- New format: `<critical>Input documents specified in workflow.yaml input_file_patterns...</critical>`
- Eliminates duplication - workflow.yaml already defines patterns
- Updated across 6 workflows (PRD, create-epics-and-stories, architecture, tech-spec, UX, gate-check)
- Saved ~114 lines of repeated bloat

### 3. Scale System Migration (Levels 0-4 → 3 Tracks)
- Updated PRD workflow from "Level 0-4" to "Quick Flow / BMad Method / Enterprise Method"
- Changed `project_level` variable to `project_track`
- Removed `target_scale` variable (no longer needed)
- Updated workflow.yaml descriptions to reference tracks not levels
- Updated checklist from "Level 2" and "Level 3-4" to "BMad Method" and "Enterprise Method"
- Aligns with new scale-adaptive-system.md (3-track methodology)

### 4. Epic/Story Template Standardization
- Replaced hardcoded 8-epic template with clean repeating pattern using N/M variables
- Added BDD-style acceptance criteria (Given/When/Then/And)
- Removed instructional bloat from templates (moved to instructions.md where it belongs)
- Template shows OUTPUT structure, instructions show PROCESS
- Applied to both create-epics-and-stories and tech-spec workflows
- Templates now use HTML comments to indicate repeating sections

### 5. Workflow.yaml Pattern Consistency
- Standardized input_file_patterns across all workflows
- Separated `recommended_inputs` (semantic WHAT) from `input_file_patterns` (file discovery WHERE)
- Removed duplication between recommended_inputs file paths and input_file_patterns
- Create-epics-and-stories now uses proper whole/sharded pattern like architecture workflow
- Solutioning-gate-check cleaned up to use semantic descriptions not file paths

## Files Changed (18)
- Core: workflow.xml (removed elicit-required tag and references)
- Audit workflow: Updated tag pattern scanner
- PRD workflow: Elicitation points, track migration, input discovery
- Create-epics-and-stories: Template rebuild, BDD format, elicitation, input patterns
- Tech-spec: Template rebuild, BDD format, input discovery
- UX Design: Input discovery streamlined
- Architecture: Elicitation at 5 key decision points, input discovery
- Gate-check: Input pattern cleanup, input discovery

## Impact
- More consistent elicitation across workflows
- Cleaner, more maintainable templates
- Better separation of concerns (templates vs instructions)
- Aligned with v6 3-track scale system
- Reduced bloat and duplication significantly

src/core/tasks/workflow.xml

@@ -13,8 +13,7 @@
     <rule n="1">Steps execute in exact numerical order (1, 2, 3...)</rule>
     <rule n="2">Optional steps: Ask user unless #yolo mode active</rule>
     <rule n="3">Template-output tags: Save content → Show user → Get approval before continuing</rule>
-    <rule n="4">Elicit tags: Execute immediately unless #yolo mode (which skips ALL elicitation)</rule>
-    <rule n="5">User must approve each major section before continuing UNLESS #yolo mode active</rule>
+    <rule n="4">User must approve each major section before continuing UNLESS #yolo mode active</rule>
   </WORKFLOW-RULES>
 
   <flow>
@@ -75,14 +74,6 @@
           <action>Display generated content</action>
           <ask>Continue [c] or Edit [e]? WAIT for response</ask>
         </if>
-
-        <if tag="elicit-required">
-          <mandate critical="true">YOU MUST READ the file at {project-root}/bmad/core/tasks/adv-elicit.xml using Read tool BEFORE presenting
-            any elicitation menu</mandate>
-          <action>Load and run task {project-root}/bmad/core/tasks/adv-elicit.xml with current context</action>
-          <action>Show elicitation menu 5 relevant options (list 1-5 options, Continue [c] or Reshuffle [r])</action>
-          <mandate>HALT and WAIT for user selection</mandate>
-        </if>
       </substep>
 
       <substep n="2d" title="Step Completion">
@@ -123,7 +114,6 @@
     </execution>
     <output>
       <tag>template-output - Save content checkpoint</tag>
-      <tag>elicit-required - Trigger enhancement</tag>
       <tag>critical - Cannot be skipped</tag>
       <tag>example - Show example output</tag>
     </output>