Add comprehensive documentation for SnapForm extension

- Created development.md for development setup and licensing information.
- Added features.md detailing functionalities and usage instructions for developers and users.
- Introduced index.md to serve as a navigation hub for the documentation.
- Developed outputs.md to explain output formats and their specifications.
- Established service.md to describe the AI Service architecture and environment setup.
- Created surface.md to outline the process of converting Image Empty to perspective meshes.

pack.py

@@ -90,7 +90,8 @@ def _apply_tar_overlay(archive_path, overlay_dir):
                     info = tarfile.TarInfo(member.name)
                     info.size = overlay_file.stat().st_size
                     info.mode = member.mode
-                    output.addfile(info, overlay_file.open("rb"))
+                    with overlay_file.open("rb") as overlay_stream:
+                        output.addfile(info, overlay_stream)
                 else:
                     with source.extractfile(member) as extracted:
                         output.addfile(member, extracted)