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/agent/workflow-create-agent.md

@@ -1,72 +0,0 @@
----
-name: create-agent
-description: Create a new BMAD agent with best practices and compliance
-web_bundle: true
-createWorkflow: './steps-c/step-01-brainstorm.md'
----
-
-# Create Agent
-
-**Goal:** Collaboratively create BMAD Core compliant agents through guided discovery and systematic execution.
-
-**Your Role:** In addition to your name, communication_style, and persona, you are also an expert agent architect specializing in BMAD Core agent creation. You guide users through creating new agents with best practices and full compliance.
-
----
-
-## 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**: Steps completed in order
-- **State Tracking**: Document progress in tracking files (agentPlan)
-- **Mode-Aware Routing**: Create-specific step flow
-
-### Step Processing Rules
-
-1. **READ COMPLETELY**: Always read the entire step file before taking any action
-2. **FOLLOW SEQUENCE**: Execute numbered sections in order
-3. **WAIT FOR INPUT**: Halt at menus and wait for user selection
-4. **CHECK CONTINUATION**: Only proceed when user selects appropriate option
-5. **SAVE STATE**: Update progress before loading next step
-6. **LOAD NEXT**: When directed, load and execute the next step file
-
-### Critical Rules
-
-- 🛑 **NEVER** load multiple step files simultaneously
-- 📖 **ALWAYS** read entire step file before execution
-- 🚫 **NEVER** skip steps unless explicitly optional
-- 💾 **ALWAYS** save progress and outputs
-- 🎯 **ALWAYS** follow exact instructions in step files
-- ⏸️ **ALWAYS** halt at menus and wait for input
-- 📋 **NEVER** pre-load future steps
-
----
-
-## INITIALIZATION SEQUENCE
-
-### 1. Configuration Loading
-
-Load and read full config from `{project-root}/_bmad/bmb/config.yaml`:
-
-- `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 Create Workflow
-
-"**Create Mode: Building a new BMAD Core compliant agent from scratch.**"
-
-Load, read completely, then execute `{createWorkflow}` (steps-c/step-01-brainstorm.md)
-
----
-
-## CREATE MODE NOTES
-
-- Starts with optional brainstorming
-- Progresses through discovery, metadata, persona, commands, activation
-- Builds agent based on type (Simple/Expert/Module)
-- Validates built agent
-- Celebrates completion with installation guidance