- Introduced a migration plan to address the deduplication issue where bare slugs were compared against full filenames, leading to undetected file-format collisions.
- Updated `name_for_inst` to return a deduplication key alongside the filename and metadata flag, ensuring callers use the bare slug for collision detection.
- Replaced disk-based seeding of `taken_names` with tree-based slugified names to maintain consistency and avoid extension mismatches.
- Refactored relevant modules including `dir.rs`, `project.rs`, and `api.rs` to utilize the new deduplication logic.
- Updated tests to validate the new deduplication behavior and ensure correct handling of file-format instances.
