feat(v5.2.0): Complete skills system integration and config cleanup

Core Changes:
- **Skills System**: Added codeagent, product-requirements, prototype-prompt-generator to skill-rules.json
- **Config Cleanup**: Removed deprecated gh module from config.json
- **Workflow Update**: Changed memorys/CLAUDE.md to use codeagent skill instead of codex

Details:
- config.json:88-119: Removed gh module (github-workflow directory doesn't exist)
- skills/skill-rules.json:24-114: Added 3 new skills with keyword/pattern triggers
  - codeagent: multi-backend, parallel task execution
  - product-requirements: PRD, requirements gathering
  - prototype-prompt-generator: UI/UX design specifications
- memorys/CLAUDE.md:3,24-25: Updated Codex skill → Codeagent skill

Verification:
- All skill activation tests PASS
- codeagent skill triggers correctly on keyword match

Generated with swe-agent-bot

Co-Authored-By: swe-agent-bot <agent@swe-agent.ai>

config.json

@@ -84,36 +84,6 @@
           "description": "Copy development commands documentation"
         }
       ]
-    },
-    "gh": {
-      "enabled": true,
-      "description": "GitHub issue-to-PR workflow with codeagent integration",
-      "operations": [
-        {
-          "type": "merge_dir",
-          "source": "github-workflow",
-          "description": "Merge GitHub workflow commands"
-        },
-        {
-          "type": "copy_file",
-          "source": "skills/codeagent/SKILL.md",
-          "target": "skills/codeagent/SKILL.md",
-          "description": "Install codeagent skill"
-        },
-        {
-          "type": "copy_dir",
-          "source": "hooks",
-          "target": "hooks",
-          "description": "Copy hooks scripts"
-        },
-        {
-          "type": "merge_json",
-          "source": "hooks/hooks-config.json",
-          "target": "settings.json",
-          "merge_key": "hooks",
-          "description": "Merge hooks configuration into settings.json"
-        }
-      ]
     }
   }
 }