Fix #10: Restructure plugin directories to ensure proper command isolation

- Create separate directories for each plugin (requirements-driven-workflow/, bmad-agile-workflow/, development-essentials/, advanced-ai-agents/)
- Update marketplace.json to use isolated source paths for each plugin
- Remove shared commands/ and agents/ directories that caused command leakage
- Each plugin now only shows its intended commands:
  - requirements-driven-workflow: 1 command (requirements-pilot)
  - bmad-agile-workflow: 1 command (bmad-pilot)
  - development-essentials: 10 commands (code, debug, test, etc.)
  - advanced-ai-agents: 0 commands (agents only)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

advanced-ai-agents/.claude-plugin/plugin.json

@@ -0,0 +1,26 @@
+{
+  "name": "advanced-ai-agents",
+  "source": "./",
+  "description": "Advanced AI agent for complex problem solving and deep analysis with GPT-5 integration",
+  "version": "1.0.0",
+  "author": {
+    "name": "Claude Code Dev Workflows",
+    "url": "https://github.com/yourusername/myclaude"
+  },
+  "homepage": "https://github.com/yourusername/myclaude",
+  "repository": "https://github.com/yourusername/myclaude",
+  "license": "MIT",
+  "keywords": [
+    "gpt5",
+    "ai",
+    "analysis",
+    "problem-solving",
+    "deep-research"
+  ],
+  "category": "advanced",
+  "strict": false,
+  "commands": [],
+  "agents": [
+    "./agents/gpt5.md"
+  ]
+}