Add PR description file

Author: cte

pr_description.md

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+Fixes #4647
+
+## Problem
+
+The .rooignore file was not properly excluding files in nested project folders. For example, when a user had:
+
+```
+Root Folder/
+├── .rooignore (contains "example-nextjs/.next/")
+└── example-nextjs/
+    └── .next/ (should be ignored but wasn't)
+```
+
+The .next folder was still being indexed despite being listed in the .rooignore file.
+
+## Root Cause
+
+The DirectoryScanner was creating a new RooIgnoreController with the directory being scanned as the working directory, instead of using the workspace root. This meant the .rooignore file was being looked for in the wrong location.
+
+## Solution
+
+- Modified DirectoryScanner to accept an optional workspaceRoot parameter
+- Updated the scanner to use the workspace root (instead of scan directory) for the RooIgnoreController
+- Updated CodeIndexServiceFactory to pass the workspace path to the scanner
+- Added fallback behavior for backward compatibility
+
+## Changes
+
+- src/services/code-index/processors/scanner.ts: Added workspaceRoot parameter and updated RooIgnoreController initialization
+- src/services/code-index/service-factory.ts: Pass workspacePath to DirectoryScanner constructor
+- src/services/code-index/processors/**tests**/scanner.spec.ts: Updated test to include new parameter
+
+## Testing
+
+- Existing tests continue to pass
+- The fix ensures .rooignore files in the workspace root properly filter files in nested directories
+- Backward compatibility maintained with fallback to scan directory if no workspace root provided