Release v2.25.3

Release: v2.25.3 [skip ci]

Patch

• Fix: Refuse operations without reserved thread contexts (#757) (b8d3403)
• Fix: Checked arithmetic for allocation sizes (#763) (89da7c5)
• Fix: Preserve hash lookup capacity across thread reserves (#765) (3cf843b)
• Fix: Guard quantized casts against zero-magnitude inputs (#758) (0c903f4)
• Fix: Refuse missing metrics in C change-metric API (#760) (490c1b2)
• Fix: Short-circuit self-renames (#761) (830f31a)
• Fix: Keep vectors_lookup_ capacity after clear() #759 (9d77be5)
• Improve: Serialize concurrent same-Index Python access with a mutex (47528b5)
• Improve: Test GIL-release contract and progress-callback path (a598493)
• Improve: Release Python GIL during long index operations (d8be67d)
• Fix: Restore ring_gt::try_push return value (18c44ee)
• Fix: Stop JavaScript Remove loop after exception throw (f3e1052)
• Fix: Stop usearch_init on make failure (2aa0070)
• Fix: Stop C-ABI metadata readers on failure (34889ee)
• Fix: Report OOM from C-ABI thread-limit changers (ad24056)
• Fix: Bounded probe in equal_iterator_gt::operator++ (b779c47)
• Fix: Resize cast buffer in change_metric for new bytes-per-vector (d544745)
• Fix: Eager-reserve thread contexts in index_dense_gt::make (#755) (b296566)