feat(wall-posts): add wall post reading/writing with comments (v1.3.0)

- Add get_wall_posts: read recent wall posts with like/comment counts
- Add create_wall_post: publish new status posts to the wall
- Add add_comment: add comments to wall posts and activities
- like_post already supports both wall posts and activities (v1.2.0)
- Update README.md with new Wall & Activities section
- Update CLAUDE.md with v1.3.0 and tool reorganization
- Update CHANGELOG.md with v1.3.0 release notes
- Add wallpublish and walladdComment documentation to SPEC.md

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

.claude/settings.local.json

@@ -5,7 +5,8 @@
       "Bash(ruff check *)",
       "Bash(uv run *)",
       "Bash(git add *)",
-      "Bash(git commit -m ' *)"
+      "Bash(git commit -m ' *)",
+      "Bash(FW_DEBUG=1 uv run mcp-familywall check)"
     ]
   }
 }