- Implemented `saveToFileBatched` for efficient batch saving of large databases using buffered I/O.
- Introduced `saveToFileOptimized` to automatically choose between regular and batched saving based on record count.
- Updated `handleInit` to use the new optimized save method.

feat(manifest): switch to adaptive hashing for file checksums

- Changed file checksum calculation to use `crypto.blake3HashFileAdaptive` for improved performance.

feat(scanner): implement parallel scanning with work queue

- Added `WorkQueue` for managing scan jobs in parallel.
- Created `scanPathParallel` to utilize multiple threads for scanning directories.
- Introduced `scanPathAdaptive` to choose between sequential and parallel scanning based on estimated workload.
- Added `scanPathWithStringPool` for memory-optimized scanning using string pooling.

feat(string_pool): add string interning for memory efficiency

- Implemented `StringPool` and `PathPool` to reduce memory allocations for repeated strings, particularly filesystem paths.
- Added functionality to track common prefixes for paths to optimize memory usage.

test: add comprehensive tests for new features

- Added tests for `saveToFileBatched`, `saveToFileOptimized`, and string pooling functionality.
- Included tests for the new work queue and parallel scanning features.