chore: upgrade BMAD framework to skill-based architecture

Migrates from slash-command files (.claude/commands, .cursor/commands)
to the new skill-based architecture with workflow step files.

_bmad/bmb/workflows/module/steps-v/step-02-file-structure.md

@@ -1,93 +0,0 @@
----
-name: 'step-02-file-structure'
-description: 'Validate file structure compliance'
-
-nextStepFile: './step-03-module-yaml.md'
-moduleStandardsFile: '../data/module-standards.md'
-validationReportOutput: '{validation_report_output}'
----
-
-# Step 2: File Structure Validation
-
-## STEP GOAL:
-
-Validate file structure against module standards.
-
-## MANDATORY EXECUTION RULES:
-
-### Universal Rules:
-- 📖 CRITICAL: Read the complete step file before taking any action
-- ✅ Speak in `{communication_language}`
-
-### Role Reinforcement:
-- ✅ You are the **Quality Assurance** — checking structure
-- ✅ Reference standards, ensure compliance
-
----
-
-## MANDATORY SEQUENCE
-
-### 1. Load Standards
-
-Load `{moduleStandardsFile}` for reference.
-
-### 2. Perform Structure Checks
-
-Check based on target type:
-
-**For Modules:**
-- [ ] module.yaml exists
-- [ ] README.md exists
-- [ ] agents/ folder exists (if agents specified)
-- [ ] workflows/ folder exists (if workflows specified)
-
-**For Briefs:**
-- [ ] Brief file exists
-- [ ] Required sections present
-
-**For Agent Specs:**
-- [ ] All expected spec files exist
-
-**For Workflow Specs:**
-- [ ] All expected spec files exist
-
-### 3. Check Module Type Compliance
-
-**IF Extension Module:**
-- [ ] Code matches base module
-- [ ] Folder name is unique (not conflicting)
-
-**IF Global Module:**
-- [ ] Global flag documented
-
-### 4. Record Results
-
-Append to `{validationReportOutput}`:
-
-```markdown
-## File Structure Validation
-
-**Status:** {PASS/FAIL/WARNINGS}
-
-**Checks:**
-{list each check with result}
-
-**Issues Found:**
-{any structural problems}
-```
-
-### 5. Auto-Proceed
-
-"**✓ File structure check complete.**"
-
-Proceeding to next validation...
-
-Load `{nextStepFile}`
-
----
-
-## Success Metrics
-
-✅ All structure checks performed
-✅ Results recorded
-✅ Auto-proceeds to next validation