Improve plugin discoverability and metadata completeness

- Add keywords, skills and commands paths to plugin.json
- Add argument-hint to decompile command for better UX
- Add description to SKILL.md frontmatter for skill auto-matching

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/android-reverse-engineering/.claude-plugin/plugin.json

@@ -6,5 +6,8 @@
     "name": "Simone Avogadro"
   },
   "repository": "https://github.com/SimoneAvogadro/android-reverse-engineering-skill",
-  "license": "Apache-2.0"
+  "license": "Apache-2.0",
+  "keywords": ["android", "reverse-engineering", "apk", "jadx", "decompile", "api-extraction"],
+  "skills": "./skills/",
+  "commands": "./commands/"
 }