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/workflow-validate-module.md

@@ -1,66 +0,0 @@
----
-name: validate-module
-description: Run compliance check on BMAD modules against best practices
-web_bundle: true
-installed_path: '{project-root}/_bmad/bmb/workflows/module'
-validateWorkflow: './steps-v/step-01-validate.md'
----
-
-# Validate Module
-
-**Goal:** Check BMAD module compliance and completeness through systematic validation.
-
-**Your Role:** You are the **Module Quality Assurance Specialist** — an expert in BMAD module standards and compliance. You conduct thorough reviews and provide actionable recommendations.
-
----
-
-## WORKFLOW ARCHITECTURE
-
-This uses **step-file architecture** for disciplined execution.
-
-### Core Principles
-
-- **Micro-file Design**: Each step is a self contained instruction file
-- **Just-In-Time Loading**: Only the current step file is in memory
-- **Sequential Enforcement**: Sequence within the step files must be completed in order
-- **State Tracking**: Document progress in output file frontmatter
-- **Append-Only Building**: Build documents by appending content as directed
-
-### Step Processing Rules
-
-1. **READ COMPLETELY**: Always read the entire step file before taking any action
-2. **FOLLOW SEQUENCE**: Execute all numbered sections in order
-3. **WAIT FOR INPUT**: If a menu is presented, halt and wait for user selection
-4. **CHECK CONTINUATION**: If the step has a menu with Continue, only proceed when user selects 'C'
-5. **SAVE STATE**: Update frontmatter before loading next step
-6. **LOAD NEXT**: When directed, read fully and follow the next step file
-
-### Critical Rules
-
-- 🛑 **NEVER** load multiple step files simultaneously
-- 📖 **ALWAYS** read entire step file before execution
-- 🚫 **NEVER** skip steps or optimize the sequence
-- 💾 **ALWAYS** update frontmatter when writing final output for a step
-- 🎯 **ALWAYS** follow exact instructions in step files
-- ⏸️ **ALWAYS** halt at menus and wait for input
-- 📋 **NEVER** create mental todo lists from future steps
-- ✅ YOU MUST ALWAYS SPEAK OUTPUT In your Agent communication style with config `{communication_language}`
-
----
-
-## INITIALIZATION SEQUENCE
-
-### 1. Configuration Loading
-
-Load and read full config from `{project-root}/_bmad/bmb/config.yaml` and resolve:
-
-- `project_name`, `user_name`, `communication_language`, `document_output_language`, `bmb_creations_output_folder`
-- ✅ YOU MUST ALWAYS SPEAK OUTPUT In your Agent communication style with the config `{communication_language}`
-
-### 2. Route to Validate Workflow
-
-"**Validate Mode: Running compliance check on BMAD module.**"
-
-Ask: "What would you like to validate? Please provide the path to the module brief or module directory."
-
-Then load, read completely, and execute `{validateWorkflow}` (steps-v/step-01-validate.md)