fix: add missing config declarations, remove remaining aliases and dead variables

- Add missing document_output_language and user_skill_level to create-story
  (referenced in instructions.xml but never declared)
- Remove retrospectives_folder alias, replace with canonical implementation_artifacts
- Remove unused sprint_status and duplicate validation alias from correct-course
- Remove unused date, planning_artifacts, tracking_system from sprint-status

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/bmm/workflows/4-implementation/correct-course/workflow.yaml

@@ -12,7 +12,6 @@ date: system-generated
 implementation_artifacts: "{config_source}:implementation_artifacts"
 planning_artifacts: "{config_source}:planning_artifacts"
 project_knowledge: "{config_source}:project_knowledge"
-sprint_status: "{implementation_artifacts}/sprint-status.yaml"
 project_context: "**/project-context.md"
 
 # Smart input file references - handles both whole docs and sharded docs
@@ -51,6 +50,5 @@ input_file_patterns:
 installed_path: "{project-root}/_bmad/bmm/workflows/4-implementation/correct-course"
 template: false
 instructions: "{installed_path}/instructions.md"
-validation: "{installed_path}/checklist.md"
 checklist: "{installed_path}/checklist.md"
 default_output_file: "{planning_artifacts}/sprint-change-proposal-{date}.md"

src/bmm/workflows/4-implementation/create-story/workflow.yaml

@@ -6,6 +6,8 @@ author: "BMad"
 config_source: "{project-root}/_bmad/bmm/config.yaml"
 user_name: "{config_source}:user_name"
 communication_language: "{config_source}:communication_language"
+document_output_language: "{config_source}:document_output_language"
+user_skill_level: "{config_source}:user_skill_level"
 date: system-generated
 planning_artifacts: "{config_source}:planning_artifacts"
 implementation_artifacts: "{config_source}:implementation_artifacts"

src/bmm/workflows/4-implementation/retrospective/instructions.md

@@ -262,7 +262,7 @@ Bob (Scrum Master): "We'll get to all of it. But first, let me load the previous
 <action>Calculate previous epic number: {{prev_epic_num}} = {{epic_number}} - 1</action>
 
 <check if="{{prev_epic_num}} >= 1">
-  <action>Search for previous retrospective using pattern: {retrospectives_folder}/epic-{{prev_epic_num}}-retro-*.md</action>
+  <action>Search for previous retrospective using pattern: {implementation_artifacts}/epic-{{prev_epic_num}}-retro-*.md</action>
 
   <check if="previous retro found">
     <output>
@@ -1303,7 +1303,7 @@ Bob (Scrum Master): "See you all when prep work is done. Meeting adjourned!"
 
 <step n="11" goal="Save Retrospective and Update Sprint Status">
 
-<action>Ensure retrospectives folder exists: {retrospectives_folder}</action>
+<action>Ensure retrospectives folder exists: {implementation_artifacts}</action>
 <action>Create folder if it doesn't exist</action>
 
 <action>Generate comprehensive retrospective summary document including:</action>
@@ -1323,11 +1323,11 @@ Bob (Scrum Master): "See you all when prep work is done. Meeting adjourned!"
 - Commitments and next steps
 
 <action>Format retrospective document as readable markdown with clear sections</action>
-<action>Set filename: {retrospectives_folder}/epic-{{epic_number}}-retro-{date}.md</action>
+<action>Set filename: {implementation_artifacts}/epic-{{epic_number}}-retro-{date}.md</action>
 <action>Save retrospective document</action>
 
 <output>
-✅ Retrospective document saved: {retrospectives_folder}/epic-{{epic_number}}-retro-{date}.md
+✅ Retrospective document saved: {implementation_artifacts}/epic-{{epic_number}}-retro-{date}.md
 </output>
 
 <action>Update {sprint_status_file} to mark retrospective as completed</action>
@@ -1366,7 +1366,7 @@ Retrospective document was saved successfully, but {sprint_status_file} may need
 
 - Epic {{epic_number}}: {{epic_title}} reviewed
 - Retrospective Status: completed
-- Retrospective saved: {retrospectives_folder}/epic-{{epic_number}}-retro-{date}.md
+- Retrospective saved: {implementation_artifacts}/epic-{{epic_number}}-retro-{date}.md
 
 **Commitments Made:**
 
@@ -1376,7 +1376,7 @@ Retrospective document was saved successfully, but {sprint_status_file} may need
 
 **Next Steps:**
 
-1. **Review retrospective summary**: {retrospectives_folder}/epic-{{epic_number}}-retro-{date}.md
+1. **Review retrospective summary**: {implementation_artifacts}/epic-{{epic_number}}-retro-{date}.md
 
 2. **Execute preparation sprint** (Est: {{prep_days}} days)
    - Complete {{critical_count}} critical path items

src/bmm/workflows/4-implementation/retrospective/workflow.yaml

@@ -51,4 +51,3 @@ input_file_patterns:
 
 # Required files
 sprint_status_file: "{implementation_artifacts}/sprint-status.yaml"
-retrospectives_folder: "{implementation_artifacts}"

src/bmm/workflows/4-implementation/sprint-status/workflow.yaml

@@ -8,10 +8,7 @@ config_source: "{project-root}/_bmad/bmm/config.yaml"
 user_name: "{config_source}:user_name"
 communication_language: "{config_source}:communication_language"
 document_output_language: "{config_source}:document_output_language"
-date: system-generated
 implementation_artifacts: "{config_source}:implementation_artifacts"
-planning_artifacts: "{config_source}:planning_artifacts"
-project_context: "**/project-context.md"
 
 # Workflow components
 installed_path: "{project-root}/_bmad/bmm/workflows/4-implementation/sprint-status"
@@ -19,7 +16,6 @@ instructions: "{installed_path}/instructions.md"
 
 # Inputs
 sprint_status_file: "{implementation_artifacts}/sprint-status.yaml"
-tracking_system: "file-system"
 
 # Smart input file references
 input_file_patterns: