refactor: streamline claude-mem integration and remove unused code

- Updated CODEMAP to reflect changes in fallback methods for package root discovery.
- Removed the `detectClaudePath` function and replaced its usage with direct references to `PACKAGE_NAME`.
- Eliminated the `claudePath` property from Settings interface and user settings configuration.
- Cleaned up path discovery logic by removing the npm list command method.
- Removed the `findExecutable` method from the Platform utility as it was no longer needed.

src/utils/platform.ts

@@ -9,19 +9,6 @@ const isWindows = platform() === 'win32';
  * Handles differences between Windows and Unix-like systems
  */
 export const Platform = {
-  /**
-   * Finds the path to an executable command
-   * @param name - Name of the executable to find
-   * @returns Full path to the executable
-   */
-  findExecutable: (name: string): string => {
-    const cmd = isWindows ? `where ${name}` : `which ${name}`;
-    return execSync(cmd, {
-      encoding: 'utf8',
-      stdio: ['ignore', 'pipe', 'ignore']
-    }).trim();
-  },
-
   /**
    * Installs uv package manager using platform-specific method
    */