chainindex-core — foundation for the reorg-safe, embeddable indexing engine.

Architecture

IndexerBuilder → IndexLoop
                     ├── BlockTracker     (head tracking, parent hash chain)
                     ├── ReorgDetector    (4 reorg scenarios)
                     ├── CheckpointManager (crash recovery)
                     ├── HandlerRegistry  (user event/block handlers)
                     └── Storage backend (memory / SQLite / Postgres)