rename: hub-guide -> code-guide

Change plugin name from 'hub-guide' to 'code-guide' to avoid AI
interpreting it as Hub-specific. Skills now show as code-guide:skill-name.
Universal best-practice, not limited to any specific project.

hooks/hooks.json

@@ -3,7 +3,7 @@
     "Stop": [{
       "hooks": [{
         "type": "prompt",
-        "prompt": "Check if hub-guide MANDATORY skills are being applied where relevant: engineering-principles, clean-code, clean-architecture, testing, error-handling, security, git-workflow, api-design. If the assistant is using evidence from codebase/docs instead of guessing, and is not violating any of these principles, respond: {\"ok\": true}. Only respond {\"ok\": false, \"reason\": \"[hub-guide] Apply MANDATORY skills: engineering-principles, clean-code, clean-architecture, testing, errLine truncated
+        "prompt": "Check if code-guide MANDATORY skills are being applied where relevant: engineering-principles, clean-code, clean-architecture, testing, error-handling, security, git-workflow, api-design. If the assistant is using evidence from codebase/docs instead of guessing, and is not violating any of these principles, respond: {\"ok\": true}. Only respond {\"ok\": false, \"reason\": \"[code-guide] Apply MANDATORY skills: engineering-principles, clean-code, clean-architecture, testing, eLine truncated
       }]
     }]
   }