- PromptBuilder::new now takes &[String] instead of Vec<String>
- GeminiClient::new now takes &str, &[String] instead of owned values
- FileBatch::from_path now takes &Path instead of PathBuf
- categorize_files_offline now takes Vec<String> (ownership) instead of &[String]
- handle_offline_organization now takes FileBatch by value
These changes eliminate ~5-50 KB of unnecessary allocations for typical
file counts, reduce allocator pressure, and improve API clarity by properly
expressing ownership semantics.
No functional changes - all tests pass.
