Major v4 framework restructuring and IDE agent improvements

This commit represents a significant milestone in the BMAD-METHOD v4 framework restructuring effort, focusing on cleaning up legacy v3 content and enhancing IDE agent configurations.

Key Changes:

1. Legacy Content Cleanup:
   - Removed entire _old/ directory containing v3 framework content (55 files, ~6900 lines)
   - Deleted deprecated checklists, personas, tasks, and templates from v3
   - Cleaned up obsolete web orchestrator configurations

2. IDE Agent Enhancements:
   - Added new IDE agent configurations for all major roles:
     * analyst.ide.md - Business Analyst agent
     * architect.ide.md - Architecture specialist agent
     * pm.ide.md - Product Manager agent
     * po.ide.md - Product Owner agent
     * devops.ide.md - DevOps/Platform Engineer agent (replacing devops-pe.ide.md)
   - Updated dev.ide.md with improved structure and commands
   - Enhanced sm.ide.md with proper persona naming (Bob)

3. New Persona Definitions:
   - Added missing persona files: dev.md, devops.md, qa.md
   - Standardized persona format across all roles

4. QA Agent Addition:
   - Added qa.yml configuration for Quality Assurance agent

5. IDE Integration Improvements:
   - Added .claude/commands/ directory for Claude Code command definitions
   - Added .cursor/rules/ for Cursor IDE integration
   - Created agent-switcher.ide.md utility for seamless agent switching

6. Command Updates:
   - Renamed /exit command to /exit-agent for clarity and consistency

7. Build System Updates:
   - Minor fixes to web-builder.js for improved bundle generation

This restructuring aligns with the v4 architecture goals of modularity, reusability, and improved developer experience across different IDE environments.

Authored-By: BMad

.claude/commands/exit-agent.md

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+# /exit-persona
+
+## Description
+
+Returns Claude to default assistant mode, exiting any active IDE agent persona.
+
+**Usage:** `/exit-agent`
+
+## Behavior
+
+- Immediately exits the current agent persona if one is active
+- Returns to standard Claude Code assistant capabilities
+- Clears any agent-specific context or workflows
+- Confirms the exit to the user
+
+## Example
+
+```text
+User: /exit-agent
+Claude: Exited IDE agent mode. I'm now back to my standard Claude Code assistant capabilities.
+```
+
+## Related Commands
+
+- `/ide-agent` - Switch to a specific IDE agent persona

.claude/commands/ide-agent.md

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+# /ide-agent
+
+## Description
+
+Switches Claude to embody a specific IDE agent persona from the BMAD-METHOD framework.
+
+**Usage:** `/ide-agent <agent-name>` or `/ide-agent` (to list available agents)
+
+**Instructions:**
+
+IMPORTANT: When an agent name is provided (e.g., `/ide-agent pm`):
+
+1. IMMEDIATELY read the file at `bmad-core/ide-agents/{agent-name}.ide.md`
+2. DO NOT search for related files or use the Task tool
+3. Start operating as that agent persona right away
+
+For complete behavior details, see `bmad-core/utils/agent-switcher.ide.md`.
+
+## Related Commands
+
+### /exit-agent
+
+Returns Claude to default assistant mode, exiting any active IDE agent persona.
+
+**Usage:** `/exit-agent` or `/exit`