Symbolic link files within cwd cannot be added to context

[khaitranhq]

Description

I often to create a symbolic link from a folder in the spec repository to task folders. When attempting to add a file via mention syntax (e.g., @path/to/file), the system rejects files located within a symbolic link directory, even though the symbolic link itself is in the current working directory.

Expected behavior: Files accessible through a symbolic link in the current working directory should be allowed in context, since the symbolic link provides a valid path from the CWD.

Actual behavior: The system displays the error message: File not added to context. Must be inside current working directory.

Reproduction Steps

1. Create a project directory:

   mkdir /tmp/project

2. Create a folder outside the project with a test file:

   mkdir /tmp/linked_folder
   echo "test content" > /tmp/linked_folder/test.txt

3. Create a symbolic link to the external folder inside the project:

   ln -s /tmp/linked_folder /tmp/project/linked_folder

4. Open opencode.nvim with /tmp/project as the working directory

5. Attempt to add the file using the mention syntax:

   @linked_folder/test.txt
   

6. Observe the error: File not added to context. Must be inside current working directory.