v0.2.1 of ocr_stabilizer

Real-time OCR overlay stabilization engine — drift correction, spatial indexing, block tracking. Built for Flutter. Changelog excerpt: Docs + metadata polish. No API change. First pub.dev-shipped release of the v0.2.x line. ### Documentation - README: install snippet updated to ^0.2.1with a breaking-change pointer back to the 0.2.0 typed-confidence migration. (#14) - README: TrackedBlockexample now lists all 14 getters (was missing innerScrollerTop, sourceQuality) with a follow-up note pointing integrators at DefaultTrackedBlockor ObservableBlockas appropriate. (#14) - README: API Reference tables refresh[...]