feat: restore g ls and g ll commands

- Add back separate g ls (short list) and g ll (detailed list) commands
- Keep g h as alias for g ls for backward compatibility
- Update documentation and quick help to show all three options
- Users now have: g ls, g ll, and g h for commit history
- Version bump to 0.6.3

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gims",
-  "version": "0.6.2",
+  "version": "0.6.3",
   "description": "Git Made Simple – AI‑powered git helper using Gemini / OpenAI",
   "author": "S41R4J",
   "license": "MIT",