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LucidGrasp 1.2.1 - Search race and score calibration fixes
Bug-fix release.
- Search race fix: the File menu could replace the in-memory index while a search was reading it (heap-use-after-free); menu actions are now gated like the buttons.
- Score calibration: identical keypoint-free images now reach 1.0 instead of topping out at 0.72, so the default 50% threshold behaves the same on every library.
- Deleted files no longer resurface as ghost results; CLI threshold is validated (0-100); progress math overflow fixed; Windows whole-drive scans skip system folders.
- New self-test cases cover the default threshold and score ceiling.