fix: remove agents field from all plugin.json files

Claude Code v2.0.44 doesn't support the agents field in plugin manifests.
Removed from: clarity-assist, pr-review, projman, claude-config-maintainer, cmdb-assistant

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/claude-config-maintainer/.claude-plugin/plugin.json

@@ -16,7 +16,5 @@
     "claude-md",
     "developer-tools"
   ],
-  "entryPoint": "agents/maintainer.md",
-  "commands": ["./commands/"],
-  "agents": ["./agents/"]
+  "commands": ["./commands/"]
 }