feat(native): implement Phase 5 AppleScript handlers and remote control

- Implemented specialized PowerPoint/Keynote handlers with auto-focus and slideshow start.
- Added native:control-presentation for remote navigation (next/prev/stop).
- Added native:list-tools handler for self-documenting the bridge API.
- Added a comprehensive project README.md.

aether_app_native_electron.code-workspace

@@ -8,6 +8,8 @@
         "git.autofetch": true,
         "markdownlint.config": {
             "MD007": false,
+            "MD030": false,
+            "MD004": false,
             "MD033": false
         }
     }