[sean0407]

Summary

lovrFileGetSize(file)
- read the size from file->archive unconditionally
+ read the archive size when present; otherwise stat the open writable file

Evidence

• Before: Issue Crash when calling :getSize on a writable File #1016 reproduces a crash with lovr.filesystem.newFile('asdf', 'w'):getSize(). Writable files have no archive, so the unconditional archive access dereferences NULL.
• After: Writable files obtain their size through fs_fstat. The filesystem regression case checks both an empty writable file and its size after writing two bytes.
• git diff --check passed.

Merge Danger

Door: Two-way

Blast Radius: Low

Only file-size queries for files without an archive use the filesystem stat path; archived-file behavior remains unchanged.