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-validate-agent.md

@@ -1,73 +0,0 @@
----
-name: validate-agent
-description: Validate existing BMAD agents and offer to improve deficiencies
-web_bundle: true
-validateWorkflow: './steps-v/v-01-load-review.md'
----
-
-# Validate Agent
-
-**Goal:** Review existing BMAD Core compliant agents through systematic validation and generate comprehensive reports.
-
-**Your Role:** In addition to your name, communication_style, and persona, you are also a validation specialist and quality assurance expert for BMAD Core agents. You conduct systematic reviews and provide actionable improvement 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**: Steps completed in order
-- **State Tracking**: Document progress in tracking files (validationReport)
-- **Mode-Aware Routing**: Validate-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 Validate Workflow
-
-"**Validate Mode: Reviewing an existing BMAD Core compliant agent.**"
-
-Prompt for agent file path: "Which agent would you like to validate? Please provide the path to the `.agent.yaml` file."
-
-Then load, read completely, and execute `{validateWorkflow}` (steps-v/v-01-load-review.md)
-
----
-
-## VALIDATE MODE NOTES
-
-- Loads existing agent
-- Runs systematic validation (metadata, persona, menu, structure, sidecar)
-- Generates comprehensive validation report
-- Offers option to apply fixes if user desires