Problem

• PQ files could be written/read using shortened base paths, leaving legacy PQ artifacts in non-canonical locations and risking missing PQ data on load.

Proposed changes

• Use the mutable component file path as the canonical PQ base for both create and load paths.
• Add a migration helper that detects legacy PQ paths, creates parent directories if needed, moves the PQ file to the canonical location, and logs success/failure in LSMVectorIndex.java.
• Import required file I/O utilities for the migration in LSMVectorIndex.java.

Testing

• Verified that PQ files are now correctly located via the canonical path.