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.

src/main/file_handlers.ts

@@ -90,15 +90,37 @@ export function registerFileHandlers() {
           });
         }
 
-        if (os.platform() === 'darwin' && ext === 'key') {
-          console.log(`Native: Launching Keynote via AppleScript for ${target}`);
-          const script = `tell application "Keynote" to open POSIX file "${target}"`;
-          return new Promise((resolve) => {
-            exec(`osascript -e "${script.replace(/"/g, '\"')}"`, (err) => {
-              if (err) resolve({ success: false, error: err.message });
-              else resolve({ success: true });
+        if (os.platform() === 'darwin') {
+          let script = '';
+          if (ext === 'key') {
+            script = `
+              tell application "Keynote"
+                activate
+                open (POSIX file "${target}")
+                delay 1
+                start (front document)
+              end tell
+            `;
+          } else if (ext === 'pptx' || ext === 'ppt') {
+            script = `
+              tell application "Microsoft PowerPoint"
+                activate
+                open (POSIX file "${target}")
+                delay 1
+                run slide show of active presentation
+              end tell
+            `;
+          }
+
+          if (script) {
+            console.log(`Native: Launching ${ext} via AppleScript for ${target}`);
+            return new Promise((resolve) => {
+              exec(`osascript -e "${script.replace(/"/g, '\\\\"')}"`, (err) => {
+                if (err) resolve({ success: false, error: err.message });
+                else resolve({ success: true });
+              });
             });
-          });
+          }
         }
       }
 
@@ -109,4 +131,4 @@ export function registerFileHandlers() {
       return { success: false, error: error.message };
     }
   });
-}
+}