thunderbird: all files installed with 0 bytes (empty)

## Description After installing `thunderbird` via `moss install`, all files in `/usr/lib/thunderbird/` are 0 bytes (empty). The package installs without errors, but the binary and all shared libraries have no content. ## Steps to reproduce 1. `sudo moss install thunderbird` 2. Installation completes successfully (no errors) 3. `thunderbird` does not launch 4. `file /usr/lib/thunderbird/thunderbird` → `empty` 5. `stat --format='%s' /usr/lib/thunderbird/libxul.so` → `0` ## Additional context - Package version: `thunderbird 149.0.1-39` (deps: `botan 3.11.1-8`, `rnp 0.18.1-8`, `thunderbird-langpacks 149.0.1-13`) - Before this attempt, `botan` also failed with a stone header error: Error: install: install: client: unpack package botan, file /.moss/cache/downloads/v1/...: read stone: header decode: Header must be 32 bytes long - Clearing the download cache (`rm -rf /.moss/cache/downloads/v1/*`) fixed the botan error, but thunderbird files remain 0 bytes even after full remove + cache clear + reinstall - Other moss packages (e.g. `bash`) are installed correctly — issue is specific to the thunderbird package