fix: remove unused frontmatter refs from step files

Drop thisStepFile, workflowFile, and epicsTemplate (where unused in
body) from all step frontmatter. Only keep variables actually
referenced in step body content.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/bmm/workflows/3-solutioning/bmad-create-epics-and-stories/steps/step-01-validate-prerequisites.md

@@ -3,9 +3,7 @@ name: 'step-01-validate-prerequisites'
 description: 'Validate required documents exist and extract all requirements for epic and story creation'
 
 # File References
-thisStepFile: './step-01-validate-prerequisites.md'
 nextStepFile: './step-02-design-epics.md'
-workflowFile: '../workflow.md'
 outputFile: '{planning_artifacts}/epics.md'
 epicsTemplate: '../templates/epics-template.md'
 

src/bmm/workflows/3-solutioning/bmad-create-epics-and-stories/steps/step-02-design-epics.md

@@ -3,11 +3,8 @@ name: 'step-02-design-epics'
 description: 'Design and approve the epics_list that will organize all requirements into user-value-focused epics'
 
 # File References
-thisStepFile: './step-02-design-epics.md'
 nextStepFile: './step-03-create-stories.md'
-workflowFile: '../workflow.md'
 outputFile: '{planning_artifacts}/epics.md'
-epicsTemplate: '../templates/epics-template.md'
 
 # Task References
 advancedElicitationTask: 'skill:bmad-advanced-elicitation'

src/bmm/workflows/3-solutioning/bmad-create-epics-and-stories/steps/step-03-create-stories.md

@@ -3,11 +3,8 @@ name: 'step-03-create-stories'
 description: 'Generate all epics with their stories following the template structure'
 
 # File References
-thisStepFile: './step-03-create-stories.md'
 nextStepFile: './step-04-final-validation.md'
-workflowFile: '../workflow.md'
 outputFile: '{planning_artifacts}/epics.md'
-epicsTemplate: '../templates/epics-template.md'
 
 # Task References
 advancedElicitationTask: 'skill:bmad-advanced-elicitation'

src/bmm/workflows/3-solutioning/bmad-create-epics-and-stories/steps/step-04-final-validation.md

@@ -3,10 +3,7 @@ name: 'step-04-final-validation'
 description: 'Validate complete coverage of all requirements and ensure implementation readiness'
 
 # File References
-thisStepFile: './step-04-final-validation.md'
-workflowFile: '../workflow.md'
 outputFile: '{planning_artifacts}/epics.md'
-epicsTemplate: '../templates/epics-template.md'
 
 # Task References
 advancedElicitationTask: 'skill:bmad-advanced-elicitation'